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{{Infobox computer
{{Infobox computer
| name         = Atari 1040STE
| name = Atari 1040STE
| image       = [[File:Atari-1040STE.jpg|frameless|upright=1.2]]
| image = [[File:Atari 1040STE.jpg|300px]]
| caption = 1040STE with color RGB monitor (SC1224) and mouse
| manufacturer = Atari Corporation
| manufacturer = Atari Corporation
| type         = Home computer
| type = Home computer / Personal computer
| release date = {{Start date|1989|09}} (Europe); {{Start date|1990|06|02}} (U.S.)<ref>Shipping windows compiled from period coverage and museum research.</ref> ([atarimuseum.info](https://www.atarimuseum.info/1040ste.htm?utm_source=chatgpt.com))
| release date = {{Start date|1989|11|13}}<ref>Contemporary summary noting the 1040STE introduction in late 1989.</ref> ([myoldcomputers.com](https://myoldcomputers.com/museum/computers/atari_1040st.htm))
| discontinued = 1994<ref>End-of-production window reported by the German Atari Museum project.</ref> ([atarimuseum.info](https://www.atarimuseum.info/1040ste.htm?utm_source=chatgpt.com))
| discontinued = 1993 (end of ST line)<ref>Overview of Atari ST line and discontinuation in 1993.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))
| price       = Launch examples: DM 1,598 (West Germany, Sept. 1989); US$699 with color monitor (June 1990); typical U.S. street price fell to US$599 by Feb. 1991.<ref>Contemporaneous pricing collated from dealer brochures and museum price tables.</ref> ([atarimuseum.info](https://www.atarimuseum.info/1040ste.htm?utm_source=chatgpt.com))
| price = Typical street prices with color monitor: US$699 (June 1990) → US$599 (Feb 1991); UK £499.99 (June 1990) → £399 (May 1991); West Germany DM 1,598 (Sep 1989).<ref>Documented regional price history for 1040STE.</ref> ([atarimuseum.de](https://www.atarimuseum.de/1040ste.htm))
| cpu         = Motorola MC68000 (PLCC) @ 8&nbsp;MHz<ref>Listed in the 520STE/1040STE Field Service Manual.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
| cpu = Motorola MC68000P8/MC68000FN8 @ 8.00 MHz (16/32‑bit)<ref>MC68000 used in STE; PLCC variant commonly C398061 marking in parts lists.</ref> ([doitarchive.github.io](https://mikrosk.github.io/doitarchive/doit_st/0303.htm))
| memory       = 1&nbsp;MB standard; 30‑pin SIMMs, expandable to 4&nbsp;MB (256&nbsp;KB or 1&nbsp;MB modules only; early units used SIPP).<ref>STE memory subsystem notes and SIMM/SIPP specifics.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/memory.php?utm_source=chatgpt.com))
| memory = 1 MB RAM standard, expandable to 4 MB via 30‑pin SIMMs (4× 256 KB or 4× 1 MB)<ref>STE SIMM configurations and limits.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/memory.php))
| storage     = Internal 3.5" DS/DD 720&nbsp;KB floppy; external floppy port; ACSI (DMA) external hard‑disk interface.<ref>Port/drive summary from contemporary reviews and hardware guides.</ref> ([atarimagazines.com](https://www.atarimagazines.com/startv5n4/enhanced.html?utm_source=chatgpt.com)) [en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
| storage = Internal 3.5" DS/DD 720 KB floppy (WD1772PH02‑02 FDC), external floppy via 14‑pin DIN; hard disks via ACSI (DB‑19) DMA port.<ref>WD1772PH02‑02 and Ajax lineage; ACSI/DMA interface overview.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Western_Digital_FD1771))<ref>DMA/ACSI port pinning and cautions.</ref> ([mikrosk.github.io](https://mikrosk.github.io/doitarchive/doit_st/0f0a.htm))
| display     = 320×200 (16 colors), 640×200 (4 colors), 640×400 mono; 4,096‑color palette; hardware fine scroll and split screen.<ref>STE graphics overview and palette expansion versus STF/M.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
| display = RGB via 13‑pin DIN: 320×200 (16 cols), 640×200 (4 cols), 640×400 mono; PAL 50 Hz / NTSC 60 Hz color; mono 71.2 Hz.<ref>ST/STE display modes and 13‑pin video connector.</ref> ([exxosforum.co.uk](https://exxosforum.co.uk/forum/viewtopic.php?t=94))<ref>DIN‑13 pinout and signal summary.</ref> ([old.pinouts.ru](https://old.pinouts.ru/Video/AtariStMonitor_pinout.shtml))
| sound       = Yamaha YM2149 PSG (3 ch + noise) + 2‑channel 8‑bit stereo DMA PCM at 6.25/12.5/25/50&nbsp;kHz; LMC1992 audio control via Microwire; stereo RCA line out.<ref>DMA sample rates and LMC1992 mixer details.</ref> ([bus-error.nokturnal.pl](https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm?utm_source=chatgpt.com)) [alive.atari.org](https://alive.atari.org/alive11/mcrowire.php?utm_source=chatgpt.com))
| sound = PSG: Yamaha YM2149F (3 voices + noise) + STE DMA 8‑bit stereo PCM at 6.25/12.5/25/50 kHz; L/R RCA line‑outs; LMC1992 Microwire mixer/EQ.<ref>STE audio: DMA rates and LMC1992 role.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))<ref>Hardware description of DMA sound, LMC1992 and Microwire control.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php))
| dimensions   = 475&nbsp;mm × 290&nbsp;mm × 70&nbsp;mm (W×D×H), case same footprint as late 1040STF/M.<ref>User‑measured case dimensions consistent across ST and STE shells.</ref> ([forums.atariage.com](https://forums.atariage.com/topic/134542-atari-520-ste-dimensions/?utm_source=chatgpt.com))
| dimensions = 475 × 290 × 70 mm (18.7 × 11.4 × 2.8 in)<ref>Measured 1040STE case dimensions.</ref> ([atariage.com](https://forums.atariage.com/topic/134542-atari-520-ste-dimensions/))
| weight       = ≈4.0–4.7&nbsp;kg (varies by PSU/drive revision).<ref>Typical bare‑unit masses reported by collections and sales logistics.</ref> ([computermuseum.wordpress.com](https://computermuseum.wordpress.com/2006/04/25/1040-stf/?utm_source=chatgpt.com)) [amibay.com](https://www.amibay.com/threads/atari-1040ste-4mb-ram-tos-1-62-german.2442186/?utm_source=chatgpt.com))
| weight = ≈4.3 kg (9 lb 7 oz) typical for 1040ST/STE chassis<ref>Approximate physical specs for 1040ST-class chassis.</ref> ([myoldcomputers.com](https://myoldcomputers.com/museum/computers/atari_1040st.htm))
| os           = TOS 1.06 (“STE TOS”) or TOS 1.62 in 256&nbsp;KB (2×128&nbsp;KB) ROMs; GEM desktop.<ref>TOS versions and ROM formats for STE.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_TOS?utm_source=chatgpt.com))
| os = TOS 1.06 (“1.6”) or TOS 1.62 in 2×128 KB ROMs; upgradable to TOS 2.06.<ref>STE shipped with TOS 1.06/1.62 in two 128 KB ROMs; 2.06 upgrade common.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))
| predecessor = [[Atari 1040STFM]]
| predecessor = [[Atari 1040STF]]<ref>STE as an enhanced evolution of the STF.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))
| successor   = [[Atari Mega STE]]
| successor = [[Atari Mega STE]]<ref>Mega STE as faster, cache-equipped successor retaining STE multimedia.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_MEGA_STE))
}}
}}


The Atari 1040STE (ST Enhanced) is the late‑generation 68000‑based ST model with upgraded graphics, audio, memory subsystem, and I/O versus the earlier STf/STfm machines. It kept the integrated keyboard/CPU form factor and 8&nbsp;MHz MC68000 while adding a 4,096‑color palette, 2‑channel DMA stereo audio with on‑board filtering and mixing, SIMM‑based RAM to 4&nbsp;MB, and two side‑mounted 15‑pin enhanced joystick/analogue ports. It shipped broadly in Europe in late 1989 and reached U.S. retail on June&nbsp;2, 1990. <ref>Overview of STE enhancements and U.S. release timing.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com)) [atarimuseum.info](https://www.atarimuseum.info/1040ste.htm?utm_source=chatgpt.com))
The Atari 1040STE (ST Enhanced) is an enhanced 1040ST-class system announced in late 1989 that added a 12‑bit color palette (4096 colors), a stereo DMA audio engine, fine hardware scrolling, and two “Enhanced Joystick Ports” (EJP, DB‑15), while retaining full ST compatibility. It shipped broadly through 1990–1992 and remained on price lists until the line’s discontinuation in 1993.<ref>STE feature set and timeframe.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))<ref>Price history snapshots for 1989–1991.</ref> ([atarimuseum.de](https://www.atarimuseum.de/1040ste.htm))


== Architecture and Processor ==
== Architecture and Processor ==
The 1040STE uses a socketed Motorola MC68000 (PLCC) clocked at 8&nbsp;MHz on a 16‑bit external bus (32‑bit internal ALU/regs). Support logic is consolidated into Atari‑designed ASICs: the GST MCU (combines GLUE, MMU, joystick/paddle logic, DMA‑audio addressing, clocking) and the GST Shifter (enhanced video and audio shifting). Early STE boards feature a discrete BLiTTER; later revisions integrate the blitter into the GST MCU. <ref>STE motherboard component map and GST MCU/SHIFTER roles.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php?utm_source=chatgpt.com)) [forums.atariage.com](https://forums.atariage.com/topic/263950-missing-blitter-from-ste/?utm_source=chatgpt.com))
At its core, the 1040STE utilizes the Motorola MC68000 microprocessor:
* Exact CPU models commonly found: Motorola MC68000P8 (DIP‑64) or MC68000FN8 (PLCC‑68, Atari p/n marking C398061).<ref>STE parts list including 68000FN8 PLCC reference.</ref> ([doitarchive.github.io](https://mikrosk.github.io/doitarchive/doit_st/0303.htm))
* Clock frequency: 8.000 MHz nominal (all regions; video timing differs by PAL/NTSC).<ref>ST family timing: CPU fixed at ~8 MHz; video at 50/60/71.2 Hz depending on mode.</ref> ([exxosforum.co.uk](https://exxosforum.co.uk/forum/viewtopic.php?t=94))
* Architecture: 16/32‑bit CISC CPU with 24‑bit physical address space (16 MB), 16‑bit external data bus; 8 data registers + 8 address registers.<ref>68000 architecture overview and 24‑bit physical addressing.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))


Key chips commonly encountered on 1040STE boards:
Major chipset and controllers (typical STE board):
- Motorola MC68000FN8 CPU (PLCC, 8&nbsp;MHz).<ref>CPU type and packaging from the Field Service Manual.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
* GST MCU (GLUE+MMU successor) — C300589‑001 (early) or C302183‑00x (later, with integrated BLiTTER). Provides DRAM control, bus arbitration (CPU/DMA), EJP/paddle interface, and address decoding for DMA sound.<ref>STE GST MCU merges GLUE/MMU; address bus 23 bits inside MCU; 4 MB DRAM limit remains; later revisions integrate BLiTTER.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php))<ref>MCU part numbers with/without integrated BLiTTER.</ref> ([atariage.com](https://forums.atariage.com/topic/263950-missing-blitter-from-ste/))
- Atari GST MCU: C300589 (earlier, separate BLiTTER) or C302183 (integrated BLiTTER) 144‑pin QFP.<ref>Part numbers for STE MCUs, with/without blitter.</ref> ([forums.atariage.com](https://forums.atariage.com/topic/263950-missing-blitter-from-ste/?utm_source=chatgpt.com)) [ebay.com](https://www.ebay.com/itm/163699098588?utm_source=chatgpt.com))
* GST Shifter (Enhanced Shifter, video + DMA audio interface) — C301712‑001 or C300588‑001 (84‑pin).<ref>STE GST Shifter part numbers.</ref> ([ataristsales.co.uk](https://www.ataristsales.co.uk/product/gst-shifter-chip-c301712-001-for-the-atari-ste-and-mega-ste/))<ref>Alternate STE shifter p/n list.</ref> ([atari-forum.com](https://www.atari-forum.com/viewtopic.php?t=29116))
- Atari GST Shifter: C301712‑001 (later SMD) or C300588‑001 (earlier 84‑pin), provides 4096‑color palette and video shift; also interfaces Microwire for LMC1992 audio.<ref>GST Shifter device references.</ref> ([ataristsales.co.uk](https://www.ataristsales.co.uk/product/gst-shifter-chip-c301712-001-for-the-atari-ste-and-mega-ste/?utm_source=chatgpt.com)) [atari-forum.com](https://www.atari-forum.com/viewtopic.php?t=29116&utm_source=chatgpt.com))
* BLiTTER (bit‑block transfer) — discrete C101643 present on many early STE boards; later integrated into C302183 MCU.<ref>BLiTTER presence and integration into later MCUs.</ref> ([wiki.newtosworld.de](https://wiki.newtosworld.de/index.php?title=Atari_Ersatzteile))<ref>MCU C302183 integrates BLiTTER.</ref> ([atariage.com](https://forums.atariage.com/topic/263950-missing-blitter-from-ste/))
- Motorola 68901 MFP (interrupt/timer/serial glue), WD1772 floppy controller, DMA controller (several revisions), Yamaha YM2149 PSG, National LMC1992 audio controller (Microwire).<ref>Part roles summarized from hardware articles and service texts.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php?utm_source=chatgpt.com)) [atariarchives.org](https://www.atariarchives.org/cfn/12/05/03/0003.php?utm_source=chatgpt.com))
* DMA Controller (HDD/floppy DMA/ACSI) — improved C398739‑001(A) in STE (known “bad” early STE DMA: C025913‑38A).<ref>Good vs. bad DMA part numbers; STE requires C398739‑001(A).</ref> ([atariage.com](https://forums.atariage.com/topic/211660-buggy-dma-chip/))
* Floppy Disk Controller — WD1772PH02‑02 (8 MHz digital data separator), basis for Atari “Ajax” HD variants in later models.<ref>WD1772 derivatives and WD1772PH02‑02 used by Atari.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Western_Digital_FD1771))
* MFP (Multi‑Function Peripheral) — MC68901 provides timers, interrupts, and serial logic integration.<ref>MFP role and registers in ST/STE.</ref> ([lynn3686.com](https://www.lynn3686.com/mfp.html))
* ACIA UARTs — 2× MC6850 for MIDI (31.25 kbps) and IKBD (keyboard/mouse) link.<ref>Presence/role of 6850 ACIAs in ST/STE.</ref> ([forum64.de](https://www.forum64.de/index.php?thread%2F3436-die-chip-nummern-und-was-dahinter-steckt%2F=))
* Keyboard controller (IKBD) — Hitachi HD6301V1/HD6301X0 (Atari CO70122‑002 etc.) on keyboard assembly.<ref>IKBD microcontroller part used across ST/STE.</ref> ([atariage.com](https://forums.atariage.com/topic/307991-stf-keyboard-not-working/))
 
Bus architecture and DMA:
* CPU bus: 16‑bit data, 24‑bit physical address. DRAM multiplexing and bus arbitration handled by GST MCU; BLiTTER performs VRAM and logical operations in memory without CPU.<ref>GST MCU responsibilities; BLiTTER offloads block operations.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php))
* ACSI DMA port: 19‑pin D‑sub; direct connection to DMA ASIC (few buffers — observe ESD precautions).<ref>ACSI/DMA pinout and cautions.</ref> ([mikrosk.github.io](https://mikrosk.github.io/doitarchive/doit_st/0f0a.htm))


== Input/Output and Expansion ==
== Input/Output and Expansion ==
Rear and side panel connectivity (varies slightly by region/revision):
External connectors (model‑typical layout; see Field Service Manual for variants):
- RS‑232C serial (DB‑25M), Centronics parallel (DB‑25F).<ref>Standard ST family I/O retained on STE.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
* Left side: 40‑contact cartridge port; 2× MIDI DIN‑5 (IN/OUT); 2× Enhanced Joystick Ports (EJP) — DB‑15HD analog/digital, supporting Jagpad/proportional devices.<ref>STE EJP introduction and DB‑15 analog capability.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_joystick_port))<ref>Pinouts for Atari Enhanced Joystick Port.</ref> ([epanorama.net](https://www.epanorama.net/hwbooks/connector/userinput/atari_enh_joy.html))
- ACSI DMA port (DB‑19) for hard disks/laser printer; external floppy (14‑pin DIN).<ref>ACSI/DMA and external floppy connector formats.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
* Underside/front recess: 2× DE‑9 (Atari‑standard) for mouse/joystick (as on ST).<ref>STE retains two DE‑9 ports for mouse/joystick.</ref> ([atarimagazines.com](https://www.atarimagazines.com/startv5n4/enhanced.html))
- Monitor out (13‑pin DIN) for RGB mono/color; some units retain TV/RF output in certain regions. <ref>Monitor/TV outputs on STE models reviewed at launch.</ref> ([atarimagazines.com](https://www.atarimagazines.com/startv5n4/enhanced.html?utm_source=chatgpt.com))
* Rear:
- MIDI In/Out (5‑pin DIN).<ref>ST‑series hallmark MIDI ports.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
** RS‑232C serial port (DB‑25M; line drivers/receivers on board),<ref>RS‑232 transceivers on ST/STE (MC1488/1489 family typical).</ref> ([atariage.com](https://forums.atariage.com/topic/173575-could-the-8-bit-chips-have-had-a-place-in-the-st/))
- Two enhanced joystick/analogue ports (DB‑15F) on the left side; accept Jaguar‑style pads/analogue controllers; adapters allow two standard DE‑9 sticks per port. <ref>STE joystick port pinout and usage.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/interfaces.php?utm_source=chatgpt.com))
** Parallel printer (Centronics via DB‑25F),
- Two DE‑9 mouse/joystick ports retained under the keyboard recess. <ref>Legacy ports placement description.</ref> ([pcworld.com](https://www.pcworld.com/article/511497/inside_atari_1040st.html?utm_source=chatgpt.com))
** ACSI (HDD/Laser) DMA port (DB‑19F),
- Stereo RCA (L/R) line‑level audio outputs. <ref>STE rear‑panel stereo jacks.</ref> ([atarimagazines.com](https://www.atarimagazines.com/startv5n4/enhanced.html?utm_source=chatgpt.com))
** External floppy (14‑pin DIN),
** TV/RF out (region PAL/NTSC; present on many STEs),
** RGB/mono monitor (13‑pin DIN),
** Stereo audio out (L/R RCA line‑level), power switch and IEC mains inlet.<ref>Rear port inventory incl. RCA audio and TV/RF; STE review.</ref> ([atarimagazines.com](https://www.atarimagazines.com/startv5n4/enhanced.html))<ref>Field Service Manual overview and back panel callouts.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html))


The internal PSU is a compact switching supply providing +5&nbsp;V and +12&nbsp;V; nominal +5&nbsp;V adjustment is 5.1&nbsp;V. <ref>Power section adjustment and fuse rating in Field Service Manual.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
Pinout references:
* Video 13‑pin DIN (RGB/Mono/Sync/Audio) pinout documented with SCART wiring guidance.<ref>DIN‑13 pinout and SCART wiring.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/interfaces.php))
* Enhanced Joystick Ports (EJP) DB‑15HD pin assignments for analog/digital modes.<ref>EJP pin map.</ref> ([allpinouts.org](https://allpinouts.org/pinouts/connectors/input_device/joystick-atari-enhanced-15-pin/))
* ACSI DMA (DB‑19) signal map and electrical caveats.<ref>ACSI pin map.</ref> ([mikrosk.github.io](https://mikrosk.github.io/doitarchive/doit_st/0f0a.htm))


== Gallery ==
== Gallery ==
<gallery>
<gallery>
File:Atari-1040STE.jpg|Atari 1040STE front view (integrated keyboard chassis).
File:Atari 1040STE.jpg|Atari 1040STE base unit.
File:Atari-1040STE-ports.jpg|Rear I/O: serial, parallel, ACSI/DMA, external floppy, TV/monitor, stereo RCA.
File:Atari STE ports.jpg|Typical STE left‑side ports: cartridge, MIDI, EJPs.  
File:Atari-1040STE-mainboard.jpg|STE mainboard (CA4003290): MC68000 (PLCC), GST MCU, GST Shifter under PSU, SIMM sockets.
File:Atari STE rear.jpg|Rear panel: serial, parallel, ACSI, FDD, TV/RF, RGB, RCA audio.
</gallery>
</gallery>


== Display and Graphics ==
== Display and Graphics ==
- Resolutions: 320×200 (16 colors), 640×200 (4 colors), 640×400 mono (SM124‑class monitor required).<ref>Resolution modes across the ST family.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
Graphics are driven by the Enhanced GST Shifter and (optionally/integrated) BLiTTER:
- Palette: 12‑bit (4,096 colors), with per‑scanline palette tricks enabling richer on‑screen color in demos/games.<ref>Palette expansion vs. earlier STs.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
* Video chip: GST Shifter C301712‑001/C300588‑001 (84‑pin) with 12‑bit RGB palette (4096 colors).<ref>STE shifter p/ns and 12‑bit palette.</ref> ([ataristsales.co.uk](https://www.ataristsales.co.uk/product/gst-shifter-chip-c301712-001-for-the-atari-ste-and-mega-ste/))<ref>STE overview with 4096‑color palette.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))
- Hardware features: BLiTTER (standard on STE; max ~4&nbsp;MB/s moves), fine hardware scroll, split screen (via Shifter timing).<ref>BLiTTER throughput and fine‑scroll support.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
* Resolutions and color depths:
- Shifter devices: early C300588‑001 (84‑pin) and later C301712‑001 (SMD) found across board revisions. <ref>Device identities and interchangeability notes.</ref> ([atari-forum.com](https://www.atari-forum.com/viewtopic.php?t=29116&utm_source=chatgpt.com))
** 320×200 @ 50/60 Hz: 16 colors selectable from 4096.
** 640×200 @ 50/60 Hz: 4 colors from 4096.
** 640×400 @ 71.2 Hz (mono): 1‑bit (SM124/SM147 monitors).<ref>Mode table and scan rates.</ref> ([exxosforum.co.uk](https://exxosforum.co.uk/forum/viewtopic.php?t=94))
* Hardware features: Horizontal and vertical fine scrolling in all ST modes; BLiTTER acceleration for block moves/fill/line; no hardware sprites (software sprites via BLiTTER/common CPU techniques).<ref>STE scrolling and BLiTTER; sprites not present.</ref> ([de.wikipedia.org](https://de.wikipedia.org/wiki/Atari_1040_STE))
* Outputs: 13‑pin DIN RGB/Sync with mono detect; composite video on pin 2 when RF modulator present; mono 640×400 on pin 11; audio I/O on pins 1/5.<ref>DIN‑13 signals and behavior.</ref> ([old.pinouts.ru](https://old.pinouts.ru/Video/AtariStMonitor_pinout.shtml))


== PCB Schematics & Service Manual ==
== PCB Schematics & Service Manual ==
Motherboard families and documentation useful to technicians:
Motherboard families and identifiers (representative):
 
- Common 1040STE board FABs/ASSYs
  - CA4003290 (early–mid runs; some with SIPP RAM, later SIMM), CA401177 (late, many SMD parts), and C300779‑001 Rev. 5.1 are observed in the field. <ref>Community‑maintained revision list and serial registry entries.</ref> ([temlib.org](https://temlib.org/AtariForumWiki/index.php/Atari_ST_motherboard_revisions?utm_source=chatgpt.com)) [milan.kovac.cc](https://milan.kovac.cc/atari/chipmunk/?id=1499348247&utm_source=chatgpt.com))
- Schematic set: “Atari STe Schematic Rev. A C300780‑001” (dated Oct‑3‑1989) corresponds closely to shipping 520/1040STE boards. <ref>Primary STe schematic drawings.</ref> ([yumpu.com](https://www.yumpu.com/it/document/view/34489511/atari-ste-schematic-rev-a-c300780-001-oct-3-1989?utm_source=chatgpt.com)) [elektrotanya.com](https://elektrotanya.com/atari_1040ste_c300780-001_rev.a_sch_1986.pdf/download.html?utm_source=chatgpt.com))
- Field Service Manual: “Atari 520STE/1040STE Field Service Manual” covers both models; PSU trim, theory of operation, diagnostics, flowcharts. <ref>Manual availability and scope.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
 
{| class="wikitable"
{| class="wikitable"
! Board/FAB (marking) !! Typical features !! Matching schematic docs
! PCB / Assy no. !! Approx. years !! Notable features
|-
| CA4003290 || Early “beta” and revised runs; some SIPP sockets; discrete BLiTTER; later sub‑runs add integrated‑BLiTTER MCU || C300780‑001 Rev.A STe schematic set
|-
|-
| C300779‑001 Rev. 5.1 || Late ’89/’90 production; SIMM RAM; frequent DMA chip updates || C300780‑001 Rev.A; field addenda
| CA4003290 || 1989–1991 || 4× 30‑pin SIMM sockets; many units with discrete BLiTTER; early “bad” DMA C025913‑38A occasionally found; TOS 1.06 → 1.62.<ref>CA4003290 sightings and timeframe.</ref> ([milan.kovac.cc](https://milan.kovac.cc/atari/chipmunk/index.php))<ref>Bad DMA identifier.</ref> ([atariage.com](https://forums.atariage.com/topic/211660-buggy-dma-chip/))
|-
|-
| CA401177 || Late SMD‑heavy run; BLiTTER in MCU; surface‑mount 68000, Shifter || C300780‑001 Rev.A + rev notes
| CA401177 || 1991–1992 || Later STE board; MCU C302183 with integrated BLiTTER common; TOS 1.62; identical external I/O.<ref>Cap kit compatibility list including CA401177.</ref> ([console5.com](https://console5.com/store/atari-520ste-1040ste-computer-cap-kit-main-ste-pcb.html))
|}
|}
Service documentation and schematics:
* 520/1040STE Field Service Manual, Part C302481‑001 Rev. A (Aug 1991), with theory of operation, troubleshooting, and schematics bundle.<ref>520/1040STE Field Service Manual C302481‑001 Rev. A.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html))
* 1040STE Schematic set C300780‑001 (1989) and Rev. A (1986 metadata), downloadable scans.<ref>Atari 1040STE C300780‑001 schematic set.</ref> ([elektrotanya.com](https://elektrotanya.com/atari_1040ste_c300780-001_sm_1989.pdf/download.html))<ref>Alternate posting of Rev. A schematic scans.</ref> ([elektrotanya.com](https://elektrotanya.com/atari_1040ste_c300780-001_rev.a_sch_1986.pdf/download.html))
* Additional foldout schematics archive entry.<ref>Archive listing for 1040STE schematic set.</ref> ([archive.org](https://archive.org/details/Atari_1040STe_Schematic_1986_Atari))


== Memory and Storage ==
== Memory and Storage ==
- DRAM: Four 30‑pin SIMM sockets (some early units shipped SIPP). Accept 256&nbsp;KB or 1&nbsp;MB 8‑bit modules (with/without parity). Supported capacities: 1, 2, or 4&nbsp;MB; 2.5&nbsp;MB is possible but has compatibility caveats. Recommended speeds: 150&nbsp;ns (256&nbsp;KB) and 120&nbsp;ns (1&nbsp;MB). <ref>STE SIMM/SIPP guidance and timing requirements.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/memory.php?utm_source=chatgpt.com))
Main memory:
- ROM: Two socketed 128&nbsp;KB ROMs (27C010 class) carrying TOS 1.06 or 1.62; upgrades and multi‑TOS switchers are common. <ref>TOS formats and upgrade practice.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_TOS?utm_source=chatgpt.com)) [ultradevtools.de](https://www.ultradevtools.de/ultraTos.html?utm_source=chatgpt.com))
* Four 30‑pin SIMM sockets (some very early STEs used soldered SIPPs). Supported modules: 256 KB (≥150 ns) and 1 MB (≥120 ns). Valid totals: 0.5 MB (520STE), 1 MB, 2 MB, 4 MB (max). 2.5 MB is unofficial and problematic due to TOS sizing — software fixes exist but are unreliable.<ref>STE SIMM support, timing and configuration matrix.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/memory.php))<ref>Reports of early SIPP‑equipped STE units.</ref> ([reddit.com](https://www.reddit.com/r/crtgaming/comments/1caoajv))
- Floppy: Internal 3.5" DS/DD 720&nbsp;KB; external 14‑pin DIN port allows second drive; HD (1.44&nbsp;MB) available only via later mods/kits. <ref>Stock floppy capabilities and external port.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
ROM:
- Mass storage: ACSI (DB‑19) hard disks; modern SD‑based ACSI devices (e.g., UltraSatan) rely on healthy DMA silicon (see DMA notes below). <ref>ACSI usage and DMA chip caveats on some STEs.</ref> ([forums.atariage.com](https://forums.atariage.com/topic/211660-buggy-dma-chip/?utm_source=chatgpt.com))
* TOS 1.06/1.62 in two 128 KB ROMs (256 KB total); sockets on mainboard. TOS 2.06 upgrades are common on later boards.<ref>STE TOS ROM organization and versions.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))
Disk storage:
* Internal 3.5" DS/DD 720 KB drive; FDC is WD1772PH02‑02. HD (1.44 MB) is possible with Ajax FDC (C302096/C302434) and TOS/logic mods (not stock).<ref>WD1772PH02‑02 background and Ajax HD controller lineage.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Western_Digital_FD1771))
* External floppy via 14‑pin DIN (secondary drive).<ref>External FDD connector pin list for ST/STE.</ref> ([oldcomputer.info](https://oldcomputer.info/8bit/ataristf/index.htm))
Mass storage:
* ACSI (DB‑19) DMA port to Atari SH/Megafile HDDs and SLM laser printers; 8‑bit DMA data at up to ~2 MB/s with efficient drivers.<ref>ACSI DMA connector details.</ref> ([mikrosk.github.io](https://mikrosk.github.io/doitarchive/doit_st/0f0a.htm))


== Related Pages ==
== Related Pages ==
- [[Atari 1040STE General Maintenance]]
* [[Atari 1040STE General Maintenance]]
- [[Atari 1040STE Troubleshooting Guide]]
* [[Atari 1040STE Troubleshooting Guide]]
- [[Atari 1040STE Capacitor Replacement Guide]]
* [[Atari 1040STE Capacitor Replacement Guide]]
- [[Atari ST and STE RAM Upgrade Guide]]
* [[Atari 1040STF]]
- [[Atari STE DMA Port & Hard‑Disk Guide]]
* [[Atari Mega STE]]


== Sound Capabilities ==
== Sound Capabilities ==
In addition to the YM2149 PSG (3 tones + noise), the STE adds 2‑channel 8‑bit PCM playback via DMA, at selectable nominal rates of 6,258/12,517/25,033/50,066&nbsp;Hz (mono or stereo). Audio is mixed and equalized by an LMC1992 controlled over the Microwire serial interface exposed by the Shifter; bass/treble and master/left/right levels are software‑settable. The STE also routes mixed audio to both the built‑in monitor mono output and to rear‑panel stereo RCA jacks. <ref>DMA registers/rates and LMC1992 control model.</ref> ([bus-error.nokturnal.pl](https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm?utm_source=chatgpt.com)) [alive.atari.org](https://alive.atari.org/alive11/mcrowire.php?utm_source=chatgpt.com)) [mikrosk.github.io](https://mikrosk.github.io/doitarchive/doit_st/0309.htm?utm_source=chatgpt.com))
Programmable Sound Generator (PSG):
 
* Yamaha YM2149F (AY‑3‑8910 compatible): 3 independent square‑wave voices + white noise; 4‑bit volume per channel; envelope generator with 8 preset shapes.<ref>ST/STE PSG characteristics.</ref> ([polynominal.com](https://www.polynominal.com/atari-st/atari-st-ym2149f-yamaha.html))
Tech note: Many units ship with PSG/DMA level imbalance (PSG “hotter”). Hardware and software adjustments are documented by the scene and repair community for achieving near‑1:1 mix when required. <ref>Documented Microwire mix corrections and best‑practice settings.</ref> ([atari.8bitchip.info](https://atari.8bitchip.info/STEamFix.html?utm_source=chatgpt.com)) [alive.atari.org](https://alive.atari.org/alive11/mcrowire.php?utm_source=chatgpt.com))
DMA PCM audio (STE‑only):
* 2‑channel, 8‑bit signed PCM via DMA under Shifter control at 6.258, 12.517, 25.033, and 50.066 kHz sample rates; mono or interleaved LR mode.<ref>STE DMA PCM rates and arrangement.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))
Analog path and mixing:
* L/R line outputs on RCA; LMC1992 digitally‑controlled volume/balance/bass/treble via Microwire; LF347 op‑amps, MF4 low‑pass filters, and dual DAC‑08/DAC‑0800 devices implement the STE analog stage.<ref>STE analog chain components (LMC1992, LF347, MF4, DAC0800 family).</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php))<ref>STE parts index including audio devices and 68000FN8.</ref> ([doitarchive.github.io](https://mikrosk.github.io/doitarchive/doit_st/0303.htm))
Connectors and levels:
* Rear panel L/R RCA line‑outs; monitor DIN‑13 pin 1 provides mono audio out (to SCART), pin 5 audio in (rarely used).<ref>Video connector audio pins.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/interfaces.php))


== General Maintenance ==
== General Maintenance ==
- PSU: Recap original switchers (DVE/Mitsumi etc.) and set +5&nbsp;V at ≈5.10&nbsp;V under load; replace the 2&nbsp;A fuse only after root‑cause analysis. <ref>PSU calibration guidance.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
Basic, preventative tasks for reliability:
- Mainboard electrolytics: Replace aging caps on CA4003290/CA401177 boards; vetted lists exist for STE cap kits. <ref>Consolidated capacitor lists for STE PCB variants.</ref> ([wiki.console5.com](https://wiki.console5.com/wiki/Atari_ST?utm_source=chatgpt.com)) [console5.com](https://console5.com/store/atari-520ste-1040ste-computer-cap-kit-main-ste-pcb.html?utm_source=chatgpt.com))
* Power/Logic: Inspect PSU electrolytics; many STEs benefit from PSU recap (heat‑stressed over decades). Maintain 5.10 V at logic under load per service manual.<ref>PSU set‑point and service notes.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html))
- Floppy: Clean/lubricate rails; verify write‑protect and track‑0 sensors; re‑align only with proper disks/tools.
* Audio: Known STE issues include DMA whistle/noise and YM/DMA level mismatch; documented fixes add filtering or adjust LMC1992 control wiring.<ref>STE DAC noise and LMC1992 mix‑level fixes.</ref> ([temlib.org](https://temlib.org/AtariForumWiki/index.php/Atari_STE_and_Mega_STE_sound_fixes))
- RAM: Use matched SIMM pairs; avoid 2&nbsp;MB/4&nbsp;MB 30‑pin modules which are not supported by the stock MMU design. <ref>Supported SIMM sizes and speeds.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/memory.php?utm_source=chatgpt.com))
* Storage: WD1772 is reliable but sockets/caps and drive belts (where fitted) age; consider HD upgrade only with proper Ajax + TOS support.
* DMA ASIC: Early STE DMA C025913‑38A is problematic with modern storage (UltraSatan/SCSI adapters). Preferred replacement: C398739‑001(A).<ref>Bad vs. good DMA identification.</ref> ([atariage.com](https://forums.atariage.com/topic/211660-buggy-dma-chip/))


For full procedures see [[Atari 1040STE General Maintenance]].
See the dedicated page: [[Atari 1040STE General Maintenance]].


== Technical Details ==
== Technical Details ==
Wikitable summary of key hardware
{| class="wikitable"
{| class="wikitable"
! Subsystem !! Device(s) / notes
! Subsystem !! IC / Part numbers (typical) !! Notes
|-
| CPU || MC68000P8 (DIP‑64) / MC68000FN8 (PLCC‑68; C398061) || 8 MHz; 24‑bit addr/16‑bit data bus<ref>68000 specs in ST family.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))
|-
| MCU (GLUE+MMU) || C300589‑001 (no BLiTTER); C302183‑002 (w/ BLiTTER) || DRAM control, bus, EJP, DMA sound addressing<ref>MCU consolidation and functions.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php))
|-
|-
| CPU || Motorola MC68000 (PLCC) @ 8&nbsp;MHz; socketed on most boards. <ref>CPU packaging and speed.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
| Video (Shifter) || C301712‑001 / C300588‑001 (GST Shifter) || 12‑bit palette (4096); fine scroll; mono detect<ref>Shifter p/ns for STE.</ref> ([ataristsales.co.uk](https://www.ataristsales.co.uk/product/gst-shifter-chip-c301712-001-for-the-atari-ste-and-mega-ste/))
|-
|-
| System ASICs || GST MCU (C300589 early, C302183 later with integrated BLiTTER); GST Shifter (C301712‑001/C300588‑001). <ref>Part numbers and integration notes.</ref> ([forums.atariage.com](https://forums.atariage.com/topic/263950-missing-blitter-from-ste/?utm_source=chatgpt.com)) [atari-forum.com](https://www.atari-forum.com/viewtopic.php?t=29116&utm_source=chatgpt.com))
| BLiTTER || C101643 (discrete) or integrated in C302183 || 16‑bit internal; ~4 MB/s peak transfers (mem‑dependent)<ref>BLiTTER presence and rate.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST))
|-
|-
| Blitter || Discrete BLiTTER on early boards; ~4&nbsp;MB/s block moves; later integrated into MCU. <ref>BLiTTER presence and throughput.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
| DMA (HDD/FDD) || C398739‑001(A) good; C025913‑38A early/bad || Drives ACSI DB‑19 and WD1772<ref>DMA ASIC variants.</ref> ([atariage.com](https://forums.atariage.com/topic/211660-buggy-dma-chip/))
|-
|-
| Memory || 4× 30‑pin SIMM sockets (or SIPP on earliest); 1–4&nbsp;MB official configurations. <ref>Memory sockets and limits.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/memory.php?utm_source=chatgpt.com))
| Floppy Ctrl. || WD1772PH02‑02 (28‑pin DIP) || DS/DD; basis for Ajax HD used later<ref>WD1772 family.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Western_Digital_FD1771))
|-
|-
| Audio || YM2149 PSG + 2‑ch DMA PCM (8‑bit) via Shifter; LMC1992 mixer/EQ (Microwire). <ref>DMA and Microwire chain.</ref> ([bus-error.nokturnal.pl](https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm?utm_source=chatgpt.com)) [alive.atari.org](https://alive.atari.org/alive11/mcrowire.php?utm_source=chatgpt.com))
| PSG || Yamaha YM2149F || 3‑voice + noise PSG; IKBD GPIP bits link to video port<ref>YM2149 in ST/STE.</ref> ([polynominal.com](https://www.polynominal.com/atari-st/atari-st-ym2149f-yamaha.html))
|-
|-
| I/O || RS‑232 (DB‑25M), Centronics (DB‑25F), ACSI DMA (DB‑19), external floppy (14‑pin DIN), monitor (13‑pin DIN), 2× MIDI, 2× DB‑15 enhanced joystick, 2× DE‑9 mouse/joystick. <ref>Panel I/O inventory.</ref> ([atarimagazines.com](https://www.atarimagazines.com/startv5n4/enhanced.html?utm_source=chatgpt.com)) [info-coach.fr](https://info-coach.fr/atari/hardware/interfaces.php?utm_source=chatgpt.com))
| DMA audio path || DAC‑0800/DAC‑08x, LF347, MF4, LMC1992 || Mixer/EQ via Microwire; stereo RCA outs<ref>Audio analog chain references.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php))
|-
|-
| FDD || WD1772 controller; 3.5" DS/DD 720&nbsp;KB internal. <ref>WD1772 use on STE.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php?utm_source=chatgpt.com))
| Interrupt/Timers || MC68901 MFP || System timers, serial support, interrupt controller<ref>MFP overview.</ref> ([lynn3686.com](https://www.lynn3686.com/mfp.html))
|-
| UARTs || 2× MC6850 ACIA || MIDI and IKBD serial links<ref>ACIA presence (part enumerations).</ref> ([forum64.de](https://www.forum64.de/index.php?thread%2F3436-die-chip-nummern-und-was-dahinter-steckt%2F=))
|}
|}


== System Architecture at a Glance ==
== System Architecture at a Glance ==
- MC68000 8&nbsp;MHz core; 24‑bit address space (16&nbsp;MB).
* CPU: MC68000 @ 8 MHz; 24‑bit address / 16‑bit data.
- GST MCU handles DRAM multiplexing, decode, DMA hand‑off, joystick/paddle and timing.
* RAM: 1–4 MB, 4× 30‑pin SIMM; 256 KB or 1 MB modules.
- GST Shifter fetches bitplanes and clocks RGB; exposes Microwire to the LMC1992 and manages DMA‑audio shift.
* ROM: 256 KB (TOS 1.06/1.62 in 2× 128 KB).
- BLiTTER accelerates block copies/fills.
* Video: 320×200×16; 640×200×4; 640×400 mono; palette 4096 (12‑bit).
- MFP 68901 provides timers/interrupt aggregation; ACIA 6850s handle MIDI and keyboard links.
* Audio: YM2149 PSG + 2‑ch 8‑bit stereo DMA at up to ~50 kHz; L/R RCA.
- DMA port (ACSI) arbitrates CPU/disk transfers. <ref>Consolidated STE block‑level description.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php?utm_source=chatgpt.com))
* I/O: DB‑25 serial/printer; DB‑19 ACSI; 14‑pin DIN external FDD; 13‑pin DIN RGB; 2× DE‑9 joystick/mouse; 2× DB‑15 EJP; MIDI IN/OUT; 40‑pin cartridge.
* Storage: Internal 720 KB DD; external floppy; ACSI HDD.
* OS: TOS 1.06/1.62; GEM desktop.


== Apple Service Manual ==
== Apple Service Manual ==
This section header is retained for template consistency; Atari 1040STE documentation is covered instead by the official 520/1040STE Field Service Manual and STe schematics listed below. <ref>Atari, not Apple, publishes the applicable service literature.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
This device is an Atari system; see the official Atari 520/1040STE Field Service Manual (C302481‑001 Rev. A, Aug 1991) for all service procedures, adjustments, and schematics.<ref>STE Field Service Manual.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html))


== Logic Board & Analog Board Schematics ==
== Logic Board & Analog Board Schematics ==
The 1040STE is a single main logic board plus a separate PSU (no discrete “analog board” as on Apple compacts). Use:
The STE uses a single main logic board and an internal switching PSU (no separate “analog board” as on compact Macs). Refer to:
- Atari STe Schematic Rev. A (C300780‑001, 1989‑10‑03). <ref>Primary schematic set for 520/1040STE.</ref> ([yumpu.com](https://www.yumpu.com/it/document/view/34489511/atari-ste-schematic-rev-a-c300780-001-oct-3-1989?utm_source=chatgpt.com))
* Schematic set C300780‑001 (1989) and Rev. A scans (drawing set).<ref>STE schematics bundle.</ref> ([elektrotanya.com](https://elektrotanya.com/atari_1040ste_c300780-001_sm_1989.pdf/download.html))<ref>Alternate Rev. A scan.</ref> ([elektrotanya.com](https://elektrotanya.com/atari_1040ste_c300780-001_rev.a_sch_1986.pdf/download.html))
- 520/1040STE Field Service Manual (diagnostics, PSU trim, theory). <ref>Field servicing content and procedures.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
* Internet Archive “Atari 1040STe Schematic”.<ref>Archive schematic entry.</ref> ([archive.org](https://archive.org/details/Atari_1040STe_Schematic_1986_Atari))


== Troubleshooting ==
== Troubleshooting ==
Common STE failure modes and pointers:
Common field issues and tips:
- No boot/white or checker screen: reseat PLCC CPU and Shifter; verify +5&nbsp;V = 5.10&nbsp;V; try known‑good SIMMs in bank order (1/3); run a diagnostic cartridge if available. <ref>Community triage tactics; RAM isolation and reseat advice.</ref> ([forums.atariage.com](https://forums.atariage.com/topic/283468-1040ste-wont-boot-help-needed/?utm_source=chatgpt.com))
* Black/blank screen: verify PSU 5.1 V and +12 V rails; reseat Shifter/ROMs; suspect GST MCU if reset toggles and no video.<ref>Service flowcharts and symptom tables.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html))
- Floppy errors: clean heads, verify WD1772 clock, check drive select and write‑protect sensors. 
* Floppy errors: WD1772 socket oxidation; drive cabling; aging electrolytics; HD mods require Ajax + TOS changes (not stock).<ref>WD1772 context and replacements.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Western_Digital_FD1771))
- ACSI hard‑disk issues: certain early DMA chips (e.g., C025913‑38) are marginal; Atari and community fixes improve bus hand‑off (pull‑up changes, small timing caps); later C398739‑001A silicon is preferred. <ref>Known “DMA bug” history and mitigation.</ref> ([exxosforum.co.uk](https://exxosforum.co.uk/atari/last/DMASG/index.htm?utm_source=chatgpt.com)) [forums.atariage.com](https://forums.atariage.com/topic/211660-buggy-dma-chip/?utm_source=chatgpt.com))
* HDD/UltraSatan glitches: replace early DMA C025913‑38A with C398739‑001(A); bus is minimally buffered — be ESD safe.<ref>Good vs. bad DMA and ACSI notes.</ref> ([atariage.com](https://forums.atariage.com/topic/211660-buggy-dma-chip/))<ref>ACSI electrical caveats.</ref> ([mikrosk.github.io](https://mikrosk.github.io/doitarchive/doit_st/0f0a.htm))
- Audio imbalance/distortion: adjust LMC1992 in software (reduce master volume a few dB) or apply documented Microwire/PSG level fix for proper DMA/PSG mix. <ref>Microwire programming and hardware correction notes.</ref> ([alive.atari.org](https://alive.atari.org/alive11/mcrowire.php?utm_source=chatgpt.com)) [atari.8bitchip.info](https://atari.8bitchip.info/STEamFix.html?utm_source=chatgpt.com))
* Noisy DMA audio / loud PSG: apply documented STE DAC noise and LMC1992 mix‑level fixes.<ref>Audio fixes roundup.</ref> ([temlib.org](https://temlib.org/AtariForumWiki/index.php/Atari_STE_and_Mega_STE_sound_fixes))


== 🧠 Architecture and Processor ==
== 🧠 Architecture and Processor ==
Deep‑dive register highlights for repair and testing:
Exact components and frequencies recap:
- DMA sound control block at $FF8900–$FF8920: set mode (mono/stereo), rate (6.25–50&nbsp;kHz), base/end addresses, and looping. <ref>Register map and recommended programming sequence for playback.</ref> ([bus-error.nokturnal.pl](https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm?utm_source=chatgpt.com))
* CPU: Motorola MC68000P8 / MC68000FN8 (Atari p/n C398061), 8.00 MHz.<ref>STE 68000 PLCC part code and speed.</ref> ([doitarchive.github.io](https://mikrosk.github.io/doitarchive/doit_st/0303.htm))
- LMC1992 Microwire writes via $FF8922/$FF8924; 11‑bit transactions (addr+data). <ref>Microwire timing, masks, and command format.</ref> ([mikrosk.github.io](https://mikrosk.github.io/doitarchive/doit_st/0309.htm?utm_source=chatgpt.com))
* Region timing: CPU frequency constant; video timing 50 Hz PAL / 60 Hz NTSC for color, 71.2 Hz for mono.<ref>Video timing by region/mode.</ref> ([exxosforum.co.uk](https://exxosforum.co.uk/forum/viewtopic.php?t=94))
- BLiTTER present flag and speed: use desktop “Blitter” option or query $FFFF8A00 series (model‑dependent). <ref>Presence and configuration checks.</ref> ([en.wikipedia.org](https://en.wikipedia.org/wiki/Atari_ST?utm_source=chatgpt.com))
* Chipset list with part numbers:
** GST MCU: C300589‑001 (no BLiTTER) or C302183‑00x (w/ BLiTTER).<ref>MCU variants.</ref> ([atariage.com](https://forums.atariage.com/topic/263950-missing-blitter-from-ste/))
** GST Shifter: C301712‑001 / C300588‑001.<ref>Shifter p/ns.</ref> ([ataristsales.co.uk](https://www.ataristsales.co.uk/product/gst-shifter-chip-c301712-001-for-the-atari-ste-and-mega-ste/))
** BLiTTER: C101643 (discrete) when present; often integrated later.<ref>BLiTTER part index.</ref> ([wiki.newtosworld.de](https://wiki.newtosworld.de/index.php?title=Atari_Ersatzteile))
** DMA: C398739‑001(A) good; C025913‑38A early/bad.<ref>DMA identification.</ref> ([atariage.com](https://forums.atariage.com/topic/211660-buggy-dma-chip/))
** FDC: WD1772PH02‑02.<ref>WD1772 details.</ref> ([wikipedia.org](https://en.wikipedia.org/wiki/Western_Digital_FD1771))
** MFP: MC68901; ACIAs: MC6850 ×2; IKBD: HD6301V1/HD6301X0 (CO70122).<ref>Peripheral controller set.</ref> ([lynn3686.com](https://www.lynn3686.com/mfp.html))<ref>ACIA/IKBD references.</ref> ([forum64.de](https://www.forum64.de/index.php?thread%2F3436-die-chip-nummern-und-was-dahinter-steckt%2F=))


== Technical Documentation ==
== Technical Documentation ==
- [[Atari 520STE/1040STE Field Service Manual]] (theory, diagnostics, PSU adjustment). <ref>Manual sources and scanned copies.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com))
* [[Atari 520/1040STE Field Service Manual (C302481‑001)]] — disassembly, diagnostics, schematics.<ref>Field Service Manual.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html))
- [[Atari 1040STE Schematics (C300780‑001 Rev.A)]] (Oct‑3‑1989). <ref>Schematics hosted by preservation sites.</ref> ([yumpu.com](https://www.yumpu.com/it/document/view/34489511/atari-ste-schematic-rev-a-c300780-001-oct-3-1989?utm_source=chatgpt.com)) [archive.org](https://archive.org/details/Atari_1040STe_Schematic_1986_Atari?utm_source=chatgpt.com))
* [[Atari 1040STE Schematics (C300780‑001)]] — schematic sheets.<ref>STE Schematics.</ref> ([elektrotanya.com](https://elektrotanya.com/atari_1040ste_c300780-001_sm_1989.pdf/download.html))
- [[Atari Compendium – Hardware Reference]] (DMA sound registers, system programming). <ref>Compendium hardware chapters.</ref> ([bus-error.nokturnal.pl](https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm?utm_source=chatgpt.com))
* [[Atari ST/STE Hardware Notes (Info‑Coach)]] — STE hardware deep dive.<ref>STE Hardware Description.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php))
- [[STE Hardware Description (Info‑Coach)]] (chip roles, LMC1992 and GST ASIC details). <ref>STE hardware overview and translations of ST Magazine technical articles.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/STE-HW.php?utm_source=chatgpt.com))
* [[Atari ST Interfaces & Connectors]] — video/ACSI/EJP pinouts.<ref>Interfaces & pinouts.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/interfaces.php))
- [[Atari ST Interfaces and Connectors (Info‑Coach)]] (pinouts for STE DB‑15 joystick and audio). <ref>Connector pinouts and port usage.</ref> ([info-coach.fr](https://info-coach.fr/atari/hardware/interfaces.php?utm_source=chatgpt.com))


=== Notes on dimensions and mass ===
== References ==
Case dimensions for the 1040‑style chassis are approximately 475×290×70&nbsp;mm, consistent with user measurements and museum entries for 1040STF/M/STE shells; bare unit weights vary across revisions and drive/PSU vendors (≈4.0–4.7&nbsp;kg). <ref>Dimension and weight observations from museum sources and shipping reports.</ref> ([forums.atariage.com](https://forums.atariage.com/topic/134542-atari-520-ste-dimensions/?utm_source=chatgpt.com)) [computermuseum.wordpress.com](https://computermuseum.wordpress.com/2006/04/25/1040-stf/?utm_source=chatgpt.com)) [amibay.com](https://www.amibay.com/threads/atari-1040ste-4mb-ram-tos-1-62-german.2442186/?utm_source=chatgpt.com))
<references/>


=== Motherboard revisions (service reference) ===
Common field sightings include CA4003290 (early/mid), C300779‑001 Rev.5.1, and CA401177 (late SMD) with combinations of discrete/integrated BLiTTER and SIPP/SIMM RAM hardware. <ref>Community rev lists and serial database entries corroborating board IDs.</ref> ([temlib.org](https://temlib.org/AtariForumWiki/index.php/Atari_ST_motherboard_revisions?utm_source=chatgpt.com)) [milan.kovac.cc](https://milan.kovac.cc/atari/chipmunk/?id=1499348247&utm_source=chatgpt.com))
== PCB Schematics & Service Guide ==
- Assembly/FAB identifiers: CA4003290 (early/mid), C300779‑001 Rev.5.1 (1989‑1990), CA401177 (late). <ref>See also cap lists keyed to board markings for recapping jobs.</ref> ([wiki.console5.com](https://wiki.console5.com/wiki/Atari_ST?utm_source=chatgpt.com))
- Schematic mapping table is provided above; use C300780‑001 Rev.A set as baseline, plus field addenda as encountered. <ref>Multiple hosts mirror the same Rev.A package; verify sheet dates.</ref> ([yumpu.com](https://www.yumpu.com/it/document/view/34489511/atari-ste-schematic-rev-a-c300780-001-oct-3-1989?utm_source=chatgpt.com))
=== Service manual and schematics (quick links) ===
- [[Atari 520/1040STE Field Service Manual]] (PSU 5.1&nbsp;V calibration, fault trees). <ref>Manualslib mirror; Best Electronics print copies.</ref> ([manualslib.com](https://www.manualslib.com/manual/2170364/Atari-520ste.html?utm_source=chatgpt.com)) [best-electronics-ca.com](https://www.best-electronics-ca.com/service_.htm?utm_source=chatgpt.com))
- [[1040STE Schematic (C300780‑001 Rev. A, 1989)]] (Internet Archive/Yumpu mirrors). <ref>Schematic sets and dates.</ref> ([archive.org](https://archive.org/details/Atari_1040STe_Schematic_1986_Atari?utm_source=chatgpt.com)) [yumpu.com](https://www.yumpu.com/it/document/view/34489511/atari-ste-schematic-rev-a-c300780-001-oct-3-1989?utm_source=chatgpt.com))
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References
<references />
Categories:
[[Category:Computers]]
[[Category:Computers]]
[[Category:Home computers]]
[[Category:Home computers]]
[[Category:Atari ST]]
[[Category:Atari ST]]
Editorial note on the “infobox” request and section names: The values supplied in the user’s template (e.g., Apple‑specific data) do not match the Atari 1040STE and would be factually incorrect if reproduced. This page therefore provides a complete, accurate “infobox computer” for the 1040STE. Likewise, Apple‑specific section titles are retained for structural compatibility, but the content points to the correct Atari service literature.
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