Editing Atari 1040STE

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{{Infobox computer
| name = Atari 1040STE
| image = [[File:Atari 1040 STE.jpg]]
| manufacturer = Atari Corporation
| type = Home computer
| caption = 1040STE with SC1224 RGB monitor
| release date = {{Start date|1989|11}}
| discontinued = 1992
| 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>
| 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>
| 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>
| 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>
| 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>
| 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>
| model = 1040STE
| 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>
| 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>
| 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 (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 ==
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>

Clocks and regional timing
* CPU clock: nominal 8 MHz.
* 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>

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 ==
All connectors (by physical type):
* 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>
* 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>
* 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: 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>
* 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>
* 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>
* 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>

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>

== Display and Graphics ==
Video subsystem (GST Shifter, STe variant):
* Resolutions and color depths:
** 320×200 pixels, 16 colors chosen from a 12‑bit (4096‑color) palette.
** 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>

== Memory and Storage ==
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>

ROM
* 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>

Floppy and mass storage
* 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>

*

== Sound Capabilities ==
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>

== 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>

Motherboard assemblies and identifiers (examples from parts list and service docs):
{| class="wikitable styled-table" style="width:100%; text-align:center;"
! Assembly/Part !! Description / Region !! Notable features
|-
| 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>
|-
| 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 ==
{| class="wikitable styled-table" style="width:100%; text-align:center;"
! Subsystem !! ICs / part numbers !! Notes
|-
| 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 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>
|-
| 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>
|-
| 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>
|-
| 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>
|-
| 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>
|-
| 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>
|}
*

== Technical Documentation ==
* [[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)]] – 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 ST Series Technical Reference Manual]] (general ST family hardware).
* [[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>

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

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