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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 1040 STE.jpg]]
| manufacturer = Atari Corporation
| manufacturer = Atari Corporation
| type         = Home computer
| type = Home 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))
| caption = 1040STE with SC1224 RGB monitor
| 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))
| release date = {{Start date|1989|11}}
| 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))
| discontinued = 1992
| 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))
| price = C$999 (Nov 1990, Canada); reduced to C$699 (Dec 1990, Canada).<ref>{{cite web |url=https://www.atarimax.com/freenet/freenet_material/6.16and32-BitComputersSupportArea/8.OnlineMagazines/showarticle.php?106= |title=Z*Net: 15-Dec-90 #549 |publisher=Atari Explorer, Z*Net & ST Report (archived at AtariMax) |date=1990-12-15 |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://www.atariarchives.org/cfn/12/03/0021.php |title=Time Capsule: News - Jan.90 - Mar.90 |publisher=AtariArchives.org |date=1990 |access-date=2025-08-12}}</ref>
| 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))
| cpu = Motorola MC68000FN8 @ 8 MHz (PLCC‑68)<ref>{{cite web |url=https://mikrosk.github.io/doitarchive/doit_st/0303.htm |title=DOIT_ST: Parts (IC cross‑refs) |publisher=DOIT_ST (archived) |access-date=2025-08-12}}</ref>
| 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))
| memory = 1 MB RAM standard; expandable to 4 MB via 30‑pin SIMMs (or early SIPP)<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – STE section |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
| 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))
| storage = Internal 3.5″ DS/DD 720 KB floppy (WD1772 controller); external 14‑pin DIN floppy; ACSI (DB‑19) hard‑disk port.<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/WD1772 |title=WD1772 |publisher=AtariForumWiki |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – Ports |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
| 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))
| display = 320×200 (16 colors from 4096) at 50 Hz PAL / 60 Hz NTSC; 640×200 (4 colors from 4096); 640×400 mono (SM124, ~71.2 Hz).<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – STE |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
| 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))
| sound = Yamaha YM2149F PSG (3 voices + noise) + 8‑bit stereo DMA PCM at 6.258/12.517/25.033/50.066 kHz; LMC1992 analog audio mixer.<ref>{{cite web |url=https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm |title=The Atari Compendium – STe/TT DMA Sound |publisher=Bus Error mirror of Atari Compendium |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – STE |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
| 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))
| model = 1040STE
| 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 (1.60) or TOS 1.62 in ROM; user‑upgradable to TOS 2.06.<ref>{{cite web |url=https://home.deds.nl/~dwvdburg/atari/tos.html |title=TOS: The Operating System |author=Dirk van den Burg |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_TOS |title=Atari TOS |publisher=Wikipedia |date=2024 |access-date=2025-08-12}}</ref>
| predecessor = [[Atari 1040STFM]]
| dimensions = 475 mm W × 290 mm D × 70 mm H (18.7 × 11.4 × 2.8 in).<ref>{{cite web |url=https://forums.atariage.com/topic/134542-atari-520-ste-dimensions/ |title=Atari 520/1040 STE dimensions (user measurement) |publisher=AtariAge Forums |date=2008 |access-date=2025-08-12}}</ref>
| successor   = [[Atari Mega STE]]
| weight = ≈4.3 kg (≈9.5 lb).<ref>{{cite web |url=https://myoldcomputers.com/museum/computers/atari_1040st.htm |title=Atari 1040STe exhibit |publisher=MyOldComputers Museum |date=1999 |access-date=2025-08-12}}</ref>
| predecessor = [[Atari 520ST|Atari 520ST]]
| successor = [[Atari TT030]]
}}
}}


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 (often stylized 1040STe) is the enhanced 1 MB member of Atari’s ST^E series, adding a 12‑bit (4096‑color) palette, stereo 8‑bit DMA audio, BLiTTER support, two enhanced joystick/analogue ports, and SIMM‑based RAM, while retaining full ST compatibility. Introduced in late 1989 and sold through the early 1990s, it was popular in Europe for music production (built‑in MIDI), DTP, and gaming.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – STE |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://www.atariarchives.org/cfn/12/03/0021.php |title=Time Capsule: News - Jan.90 - Mar.90 |publisher=AtariArchives.org |date=1990 |access-date=2025-08-12}}</ref>


== 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))
The 1040STE uses a 16/32‑bit CISC CPU and a small set of Atari and third‑party support ICs:
* CPU: Motorola MC68000FN8 (PLCC‑68) clocked at 8 MHz; 16‑bit data bus, 24‑bit address bus (16 MB address space).<ref>{{cite web |url=https://mikrosk.github.io/doitarchive/doit_st/0303.htm |title=DOIT_ST: Parts (C398061 68000FN8 PLCC MPU, STE) |publisher=DOIT_ST |access-date=2025-08-12}}</ref>
* MFP: Motorola MC68901 (interrupt controller, timers, RS‑232 control).<ref>{{cite web |url=https://lynn3686.com/mfp.html |title=Atari ST MFP (MC68901) |publisher=Lynn3686 |access-date=2025-08-12}}</ref>
* ACIAs: 2 × MC6850 (keyboard/IKBD and MIDI serial links).<ref>{{cite web |url=https://info-coach.fr/atari/hardware/STE-HW.php |title=Atari STE Hardware (translated ST Mag. No. 44) |publisher=Info‑Coach.fr |date=2021-08-16 |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://www.bighole.nl/pub/mirror/homepage.ntlworld.com/kryten_droid/Atari/ST/spg/st_prog_guide_1.htm |title=Concise Atari ST Programmer’s Guide – IKBD interface |access-date=2025-08-12}}</ref>
* PSG: Yamaha YM2149F programmable sound generator (3 tone channels + noise).<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/Yamaha_YM2149 |title=Yamaha YM2149 |publisher=AtariForumWiki |access-date=2025-08-12}}</ref>
* DMA sound: 8‑bit PCM stereo using dedicated DMA audio hardware; sample rates 6,258 / 12,517 / 25,033 / 50,066 Hz.<ref>{{cite web |url=https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm |title=Atari Compendium – STe/TT DMA Sound |publisher=Bus‑Error mirror |access-date=2025-08-12}}</ref>
* Audio mixer/EQ: National (TI) LMC1992 (Microwire‑controlled volume/bass/treble/balance).<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – STE |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
* Video: GST Shifter (STe variants C300588‑001 / C301712‑001) with 12‑bit palette; hardware fine scroll; BLiTTER support via discrete PLCC‑68 BLiTTER or integrated MCU (see below).<ref>{{cite web |url=https://www.atari-forum.com/viewtopic.php?t=29116 |title=Atari‑Forum: STE shifter & MCU part numbers |publisher=Atari‑Forum |date=2016 |access-date=2025-08-12}}</ref>
* MMU/GLUE: STe “GST MCU” (C300589 without BLiTTER; later C302183 with BLiTTER integrated, 144‑pin QFP).<ref>{{cite web |url=https://forums.atariage.com/topic/263950-missing-blitter-from-ste/ |title=Missing BLiTTER from STE (IC IDs) |publisher=AtariAge Forums |date=2017 |access-date=2025-08-12}}</ref>
* Floppy disk controller: Western Digital WD1772 (most commonly WD1772‑02‑02).<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/WD1772 |title=WD1772 |publisher=AtariForumWiki |access-date=2025-08-12}}</ref>
* ACSI/DMA disk interface: early STE boards use DMA IC C025913‑38; later boards use C398739‑001A with timing fix (see Troubleshooting).<ref>{{cite web |url=https://www.chzsoft.de/site/hardware/new-atari-ste-bad-dma-investigation/ |title=A new Atari STE bad DMA investigation |author=Christian Zietz |date=2023-04-22 |publisher=CHZ‑Soft |access-date=2025-08-12}}</ref>


Key chips commonly encountered on 1040STE boards:
Clocks and regional timing
- 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))
* CPU clock: nominal 8 MHz.
- 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))
* Video timing: 50 Hz PAL / 60 Hz NTSC in color modes; ~71.2 Hz vertical in high‑resolution mono (SM124).<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – Models/Video |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
- 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))
 
- 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))
Bus architecture and DMA
* Data bus: 16‑bit; address bus: 24‑bit; flat memory model (0–4 MB ST‑RAM typical). BLiTTER and DMA arbitrate memory with the GST MCU; DMA channels for floppy and ACSI hard disk; separate audio DMA engine for stereo PCM.<ref>{{cite web |url=https://info-coach.fr/atari/hardware/STE-HW.php |title=Atari STE Hardware |publisher=Info‑Coach.fr |date=2021-08-16 |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm |title=Atari Compendium – STe/TT DMA Sound |publisher=Bus‑Error mirror |access-date=2025-08-12}}</ref>


== Input/Output and Expansion ==
== Input/Output and Expansion ==
Rear and side panel connectivity (varies slightly by region/revision):
All connectors (by physical type):
- 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))
* Video: 13‑pin Atari DIN (RGB analog, mono, H/V sync, audio in/out, +12 V sense). Pinout widely documented for ST/STE.<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/Atari_ST_VGA_Cable_Procedures |title=Atari ST 13‑pin video pinout |publisher=AtariForumWiki |date=2006 |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://info-coach.fr/atari/hardware/interfaces.php |title=Atari ST Interfaces / Connectors / Cables |publisher=Info‑Coach.fr |access-date=2025-08-12}}</ref>
- 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))
* Television RF (region dependent): present on NTSC “W/MOD” assemblies (onboard modulator).<ref>{{cite web |url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57 |title=Atari 520/1040STE Field Service Manual – Parts List |publisher=ManualsLib |access-date=2025-08-12}}</ref>
- 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))
* Audio out: 2 × RCA (Left/Right) stereo line outputs (rear panel).<ref>{{cite web |url=https://info-coach.fr/atari/hardware/interfaces.php |title=Atari STE Stereo Audio Interface |publisher=Info‑Coach.fr |access-date=2025-08-12}}</ref>
- 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))
* MIDI: 2 × 5‑pin DIN (MIDI IN/OUT), 31.25 kbit/s via 6850 ACIA.<ref>{{cite web |url=https://www.bighole.nl/pub/mirror/homepage.ntlworld.com/kryten_droid/Atari/ST/spg/st_prog_guide_1.htm |title=Concise Atari ST Programmer’s Guide – IKBD/MIDI |access-date=2025-08-12}}</ref>
- 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))
* Serial (modem): DB‑25 male RS‑232C; printer: DB‑25 female Centronics‑compatible parallel.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – Ports |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
- 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))
* Joystick/mouse (legacy): 2 × DE‑9 male under keyboard (Port 0 mouse/joystick; Port 1 joystick). Pinout is standard Atari/Kempston.<ref>{{cite web |url=https://trumouse.com/atari-st-joystick-pinout/ |title=Atari ST 9‑pin joystick/mouse pinout |publisher=TruMouse |access-date=2025-08-12}}</ref>
- 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))
* Enhanced joystick/analogue: 2 × DA‑15 (DB‑15F) “Enhanced Joystick Ports” (supporting extra buttons, paddles/light pen).<ref>{{cite web |url=https://allpinouts.org/pinouts/connectors/input_device/joystick-atari-enhanced-15-pin/ |title=Atari Enhanced 15‑pin joystick (STE/Falcon/Jaguar) pinout |publisher=AllPinouts |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://info-coach.fr/atari/hardware/STE-HW.php |title=Atari STE Hardware – New Joysticks/Paddles/Pen |publisher=Info‑Coach.fr |date=2021-08-16 |access-date=2025-08-12}}</ref>
* External floppy: 14‑pin round DIN.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – Ports |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
* ACSI (DMA hard‑disk/laser printer): 19‑pin D‑sub (DB‑19).<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – Ports |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
* Cartridge: 40‑contact card‑edge slot (128 KB ROMs typical).<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – ST cartridge port |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>


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))
I/O controller devices on the mainboard commonly include MC68901 MFP, MC6850 ACIAs (2×), RS‑232 line drivers/receivers (e.g., SN75188/SN75189 or MC1488/MC1489 on some revisions).<ref>{{cite web |url=https://mikrosk.github.io/doitarchive/doit_st/0303.htm |title=DOIT_ST: Parts |publisher=DOIT_ST |access-date=2025-08-12}}</ref>
 
== Gallery ==
<gallery>
File:Atari-1040STE.jpg|Atari 1040STE front view (integrated keyboard chassis).
File:Atari-1040STE-ports.jpg|Rear I/O: serial, parallel, ACSI/DMA, external floppy, TV/monitor, stereo RCA.
File:Atari-1040STE-mainboard.jpg|STE mainboard (CA4003290): MC68000 (PLCC), GST MCU, GST Shifter under PSU, SIMM sockets.
</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))
Video subsystem (GST Shifter, STe variant):
- 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))
* Resolutions and color depths:
- 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))
** 320×200 pixels, 16 colors chosen from a 12‑bit (4096‑color) palette.
- 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))
** 640×200 pixels, 4 colors from 4096.
** 640×400 pixels, 1‑bit mono (SM124 monitor at ~71.2 Hz).<ref>{{cite web|url=https://en.wikipedia.org/wiki/Atari_ST|title=Atari ST – STE and video modes|publisher=Wikipedia|date=2025|access-date=2025-08-12}}</ref>
* Palette: 16 registers, 12‑bit RGB (4‑4‑4). Raster tricks permit more onscreen colors.
* Scrolling and BLiTTER: hardware fine horizontal/vertical scroll; BLiTTER accelerates block moves, line fills, and masked ops (PLCC‑68, or integrated in later GST MCU).<ref>{{cite web|url=https://mikrosk.github.io/doitarchive/doit_st/080104.htm|title=DOIT_ST: BLiTTER|publisher=DOIT_ST|access-date=2025-08-12}}</ref>
* Sprites: none (implemented in software with BLiTTER or CPU).
* Outputs: 13‑pin DIN RGB/mono; optional RF modulator on “W/MOD” assemblies for TV display; SCART compatible with passive cable (resistor recommendations vary by model).<ref>{{cite web|url=https://info-coach.fr/atari/hardware/interfaces.php|title=Atari Video cables and SCART mapping|publisher=Info‑Coach.fr|access-date=2025-08-12}}</ref>


== PCB Schematics & Service Manual ==
== Memory and Storage ==
Motherboard families and documentation useful to technicians:
RAM organization and expansion
* Stock RAM: 1 MB ST‑RAM using 30‑pin SIMMs (some early boards used SIPPs). Configurations of 0.5/1/2/4 MB supported officially; 4 MB max via 4×1 MB or 2×2 MB depending on socketing; 2.5 MB is not officially supported.<ref>{{cite web|url=https://en.wikipedia.org/wiki/Atari_ST|title=Atari ST – STE memory (SIMM/SIPP)|publisher=Wikipedia|date=2025|access-date=2025-08-12}}</ref>
* Addressing: contiguous ST‑RAM in the lower 4 MB of the 24‑bit space; DMA sound fetches must reside in first 4 MB.<ref>{{cite web|url=https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm|title=Atari Compendium – DMA sound register map|publisher=Bus‑Error mirror|access-date=2025-08-12}}</ref>


- Common 1040STE board FABs/ASSYs
ROM
  - 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))
* TOS 1.06 (1.60) or 1.62: 256 KB (two 128 KB ROMs in most STEs). 1.62 fixed desktop medium‑resolution boot bug in 1.60; users often upgrade to TOS 2.06 (256 KB) for enhanced desktop and 1.44 MB floppy support in Mega STE class machines.<ref>{{cite web|url=https://home.deds.nl/~dwvdburg/atari/tos.html|title=TOS versions overview|author=Dirk van den Burg|access-date=2025-08-12}}</ref><ref>{{cite web|url=https://en.wikipedia.org/wiki/Atari_TOS|title=Atari TOS|publisher=Wikipedia|date=2024|access-date=2025-08-12}}</ref>
- 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"
Floppy and mass storage
! Board/FAB (marking) !! Typical features !! Matching schematic docs
* Floppy: 3.5″ DS/DD 720 KB internal; WD1772 controller (many -02‑02 variants). Stock STE units are DD; later HD support requires “AJAX” controller (C302096) not normally fitted to 1040STE (standard on Mega STE).<ref>{{cite web|url=https://temlib.org/AtariForumWiki/index.php/WD1772|title=WD1772|publisher=AtariForumWiki|access-date=2025-08-12}}</ref>
|-
* ACSI hard‑disk: external via DB‑19; common modern replacements include UltraSatan/ACSI2STM. Early DMA IC C025913‑38 can cause write corruption on some STE boards; later C398739‑001 fixes timing (see Troubleshooting).<ref>{{cite web|url=https://www.chzsoft.de/site/hardware/new-atari-ste-bad-dma-investigation/|title=STE bad DMA investigation|author=Christian Zietz|date=2023-04-22|access-date=2025-08-12}}</ref>
| 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
|-
| CA401177 || Late SMD‑heavy run; BLiTTER in MCU; surface‑mount 68000, Shifter || C300780‑001 Rev.A + rev notes
|}


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


== 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 and PCM playback:
* YM2149F PSG: three independent square‑wave tone channels plus white noise; 4‑bit per‑channel volume and envelope generator; routed through LMC1992 mixer.<ref>{{cite web|url=https://temlib.org/AtariForumWiki/index.php/Yamaha_YM2149|title=Yamaha YM2149|publisher=AtariForumWiki|access-date=2025-08-12}}</ref>
* DMA PCM: 8‑bit mono or stereo, sample rates ≈6.258/12.517/25.033/50.066 kHz; memory‑mapped control registers at $FF8900–$FF8924; addresses must be even, and buffers must reside within first 4 MB of ST‑RAM.<ref>{{cite web|url=https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm|title=Atari Compendium – STe DMA sound|publisher=Bus‑Error mirror|access-date=2025-08-12}}</ref>
* Outputs: rear L/R RCA line out; mono audio is also available on the 13‑pin monitor connector (pin 1).<ref>{{cite web|url=https://info-coach.fr/atari/hardware/interfaces.php|title=Atari ST Interfaces – Video/Audio pins|publisher=Info‑Coach.fr|access-date=2025-08-12}}</ref>


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))
== PCB Schematics & Service Manual ==
Atari provided an official field service manual covering both 520STE and 1040STE with schematics and parts lists.
* Core documents:
** [[Atari 520STE/1040STE Field Service Manual|520/1040STE Field Service Manual]] (81 pages), includes: CPU/BLiTTER/ROM/CLK; RS‑232/Parallel/MIDI/PSG; DMA/FDD; MCU/SHIFTER/Video; Stereo Sound/Enhanced Joystick; RAM; PSU; Test fixture.<ref>{{cite web|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html|title=Atari 520STE / 1040STE Field Service Manual|publisher=ManualsLib|access-date=2025-08-12}}</ref>
** 1040STE schematic set (assembly C300780‑001 Rev. A).<ref>{{cite web|url=https://elektrotanya.com/atari_1040ste_c300780-001_rev.a_sch_1986.pdf/download.html|title=ATARI 1040STE C300780‑001 Rev.A – Schematics|publisher=Elektrotanya|date=1986|access-date=2025-08-12}}</ref><ref>{{cite web|url=https://archive.org/details/Atari_1040STe_Schematic_1986_Atari|title=Atari 1040STe Schematic|publisher=Internet Archive|date=1986|access-date=2025-08-12}}</ref>


== General Maintenance ==
Motherboard assemblies and identifiers (examples from parts list and service docs):
- 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))
{| class="wikitable styled-table" style="width:100%; text-align:center;"
- 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))
! Assembly/Part !! Description / Region !! Notable features
- Floppy: Clean/lubricate rails; verify write‑protect and track‑0 sensors; re‑align only with proper disks/tools.
|-
- 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))
| CA400339‑201 || Main assembly 1040STE W/MOD (USA) || NTSC unit with RF modulator (TV).<ref>{{cite web|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57|title=Service Manual – Parts (CA400339‑201)|publisher=ManualsLib|access-date=2025-08-12}}</ref>
 
|-
For full procedures see [[Atari 1040STE General Maintenance]].
| CA400340‑111 || PCB 1040STE USA W/MOD || Board assembly for NTSC with modulator.<ref>{{cite web|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57|title=Service Manual – Parts (CA400340‑111)|publisher=ManualsLib|access-date=2025-08-12}}</ref>
|-
| CA400329‑101 || PCB sub‑assembly STE NTSC W/MOD || Sub‑assembly with modulator, cabling.<ref>{{cite web|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57|title=Service Manual – Parts (CA400329‑101)|publisher=ManualsLib|access-date=2025-08-12}}</ref>
|-
| CA400366‑001 || TOS ROM set 1.62 (USA) || ICs C301163‑002 (HI), C301164‑002 (LO).<ref>{{cite web|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57|title=Service Manual – Parts (CA400366‑001)|publisher=ManualsLib|access-date=2025-08-12}}</ref>
|-
| CA070059‑003 || PSU 110 V assembly (USA/CAN) || Region PSU module.<ref>{{cite web|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57|title=Service Manual – Parts (CA070059‑003)|publisher=ManualsLib|access-date=2025-08-12}}</ref>
|}


== Technical Details ==
== Technical Details ==
{| class="wikitable"
{| class="wikitable styled-table" style="width:100%; text-align:center;"
! Subsystem !! Device(s) / notes
! Subsystem !! ICs / part numbers !! Notes
|-
|-
| 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))
| CPU || Motorola MC68000FN8 (C398061) || 8 MHz PLCC‑68; 16‑bit data / 24‑bit address.<ref>{{cite web |url=https://mikrosk.github.io/doitarchive/doit_st/0303.htm |title=DOIT_ST: Parts |publisher=DOIT_ST |access-date=2025-08-12}}</ref>
|-
|-
| 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))
| System glue/MMU || GST MCU C300589 (no BLiTTER) or C302183 (with BLiTTER) || 144‑pin QFP on later boards; integrates address decode, DRAM timing, joystick A/D, BLiTTER (when C302183).<ref>{{cite web |url=https://forums.atariage.com/topic/263950-missing-blitter-from-ste/ |title=Missing BLiTTER from STE (IC IDs) |publisher=AtariAge Forums |date=2017 |access-date=2025-08-12}}</ref>
|-
|-
| 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))
| Video (Shifter) || GST Shifter C300588‑001 / C301712‑001 || 12‑bit palette (4096 colors).<ref>{{cite web |url=https://www.atari-forum.com/viewtopic.php?t=29116 |title=Atari‑Forum: STE Shifter part numbers |publisher=Atari‑Forum |date=2016 |access-date=2025-08-12}}</ref>
|-
|-
| 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))
| BLiTTER || PLCC‑68 Atari BLiTTER (various revs) or integrated in C302183 || Block move/line op accelerator.<ref>{{cite web |url=https://mikrosk.github.io/doitarchive/doit_st/080104.htm |title=DOIT_ST: BLiTTER |publisher=DOIT_ST |access-date=2025-08-12}}</ref>
|-
|-
| 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 voices + noise; envelope generator.<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/Yamaha_YM2149 |title=Yamaha YM2149 |publisher=AtariForumWiki |access-date=2025-08-12}}</ref>
|-
|-
| 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 sound || DMA engine in STe video/audio path; DAC‑08 class converters; LMC1992 mixer || Stereo 8‑bit PCM at 6.258–50.066 kHz; Microwire control.<ref>{{cite web |url=https://bus-error.nokturnal.pl/atari_compendium/html/chap5.htm |title=Atari Compendium – DMA sound |publisher=Bus‑Error mirror |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://mikrosk.github.io/doitarchive/doit_st/0303.htm |title=DOIT_ST: Parts (C398058 LMC1992; C398057 DAC‑0800) |publisher=DOIT_ST |access-date=2025-08-12}}</ref>
|-
|-
| 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))
| Floppy controller || WD1772 (often ‑02‑02) || 720 KB DD; late HD requires AJAX (not stock on 1040STE).<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/WD1772 |title=WD1772 |publisher=AtariForumWiki |access-date=2025-08-12}}</ref>
|-
| ACSI/DMA || C025913‑38 (early) or C398739‑001(A) (later) || Later IC fixes write‑timing corruption on some early STEs.<ref>{{cite web |url=https://www.chzsoft.de/site/hardware/new-atari-ste-bad-dma-investigation/ |title=STE bad DMA investigation |author=Christian Zietz |date=2023-04-22 |access-date=2025-08-12}}</ref>
|-
| I/O support || MC68901; 2× MC6850; RS‑232 line drivers/receivers || Timers/interrupts, MIDI/IKBD ACIAs; DB‑25 RS‑232/parallel.<ref>{{cite web |url=https://info-coach.fr/atari/hardware/STE-HW.php |title=Atari STE Hardware |publisher=Info‑Coach.fr |date=2021-08-16 |access-date=2025-08-12}}</ref>
|}
|}
 
*
== System Architecture at a Glance ==
- MC68000 8&nbsp;MHz core; 24‑bit address space (16&nbsp;MB). 
- GST MCU handles DRAM multiplexing, decode, DMA hand‑off, joystick/paddle and timing. 
- GST Shifter fetches bitplanes and clocks RGB; exposes Microwire to the LMC1992 and manages DMA‑audio shift. 
- BLiTTER accelerates block copies/fills. 
- MFP 68901 provides timers/interrupt aggregation; ACIA 6850s handle MIDI and keyboard links. 
- 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))
 
== 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))
 
== 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:
- 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))
- 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))
 
== Troubleshooting ==
Common STE failure modes and pointers:
- 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))
- Floppy errors: clean heads, verify WD1772 clock, check drive select and write‑protect sensors. 
- 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))
- 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))
 
== 🧠 Architecture and Processor ==
Deep‑dive register highlights for repair and testing:
- 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))
- 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))
- 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))


== 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 520STE/1040STE Field Service Manual|Atari 1040STE Field Service Manual]] (covers diagnostics, schematics).<ref>{{cite web |url=https://www.manualslib.com/manual/2170364/Atari-520ste.html |title=Atari 520/1040STE Field Service Manual |publisher=ManualsLib |access-date=2025-08-12}}</ref>
- [[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 Rev.A)]] – full board interconnects.<ref>{{cite web |url=https://archive.org/details/Atari_1040STe_Schematic_1986_Atari |title=Atari 1040STe Schematic |publisher=Internet Archive |access-date=2025-08-12}}</ref>
- [[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 Series Technical Reference Manual]] (general ST family hardware).
- [[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))
* [[TOS 1.6/1.62/2.06 notes]] (revisions and upgrade guidance).<ref>{{cite web |url=https://home.deds.nl/~dwvdburg/atari/tos.html |title=TOS: The Operating System |access-date=2025-08-12}}</ref>
- [[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 ===
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))
 
=== 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))
 
----
 
References
<references />
 
Categories:
[[Category:Computers]]
[[Category:Home computers]]
[[Category:Atari ST]]


== Related Pages ==
* [[Atari 1040STE General Maintenance]]
* [[Atari 1040STE Troubleshooting Guide]]
* [[Atari 1040STE Capacitor Replacement Guide]]
* [[Atari ST Monitors (SM124/SC1224)]] 


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.
== References ==
<references/>
[[Category:Atari Systems]]
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