RetroTechCollection

Atari 1040STE: Difference between revisions

← Older edit
undoJosh (talk | contribs)
Bureaucrats, Interface administrators, Moderators, Suppressors, Administrators
6,590 edits
VisualWikitext
 
(10 intermediate revisions by the same user not shown)
Line 1: Line 1:
<templatestyles src="Template:StyledTable/styles.css" />
{{Infobox computer
{{Infobox computer
| name = Atari 1040STE
| name = Atari 1040STE
| image = [[File:Atari1040STE.jpg]]
| image = [[File:Atari 1040 STE.jpg]]
| manufacturer = Atari Corporation
| manufacturer = Atari Corporation
| type = Home computer
| type = Home computer
Line 17: Line 18:
| 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>
| 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>
| 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 1040ST|Atari 1040ST/STFM]]
| predecessor = [[Atari 520ST|Atari 520ST]]
| successor = [[Mega STe]]
| successor = [[Atari TT030]]
}}
}}


Line 57: Line 58:


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>
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:Atari1040STE.jpg|1040STE with two front DB‑15 enhanced joystick ports visible.
File:Atari-ST-13pindin.svg|13‑pin video connector pinout (ST/STE family).<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/Atari_ST_VGA_Cable_Procedures |title=Atari ST 13‑pin video pinout |publisher=AtariForumWiki |access-date=2025-08-12}}</ref>
</gallery>


== Display and Graphics ==
== Display and Graphics ==
Line 69: Line 64:
** 320×200 pixels, 16 colors chosen from a 12‑bit (4096‑color) palette.
** 320×200 pixels, 16 colors chosen from a 12‑bit (4096‑color) palette.
** 640×200 pixels, 4 colors from 4096.
** 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>
** 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.
* 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>
* 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).
* 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>
* 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 ==
== PCB Schematics & Service Manual ==
Atari provided an official field service manual covering both 520STE and 1040STE with schematics and parts lists.
Atari provided an official field service manual covering both 520STE and 1040STE with schematics and parts lists.
* Core documents:
* Core documents:
** 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>
** [[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>
** 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):
Motherboard assemblies and identifiers (examples from parts list and service docs):
{| class="wikitable"
{| class="wikitable styled-table" style="width:100%; text-align:center;"
! Assembly/Part !! Description / Region !! Notable features
! 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>
| 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>
| 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>
| 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>
| 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>
| 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>
|}
|}
== 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>
== Related Pages ==
* [[Atari 1040STE General Maintenance]]
* [[Atari 1040STE Troubleshooting Guide]]
* [[Atari 1040STE Capacitor Replacement Guide]]
* [[Atari ST Monitors (SM124/SC1224)]] 
* [[Mega STe]] (successor) and [[Atari 1040ST]] (predecessor)
== 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>
== General Maintenance ==
Basic service practices for longevity:
* PSU: recap common Mitsumi SR98/related supplies; replace high‑ESR electrolytics and weak rectifier; verify +5 V/+12 V under load. Community kits and guides document recommended values and upgrades.<ref>{{cite web |url=https://www.exxosforum.co.uk/atari/last/psu/index.htm |title=The LaST Upgrade – Atari PSU Repair (SR98) |author=exxos |publisher=EXXOS Forum |access-date=2025-08-12}}</ref>
* “Bad DMA” mitigation (early STE): if C025913‑38 is fitted, consider replacement with C398739‑001A or apply board‑level fixes; modern research identifies a ready timing issue on RDY between DMA and GST MCU causing missed writes on some boards.<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 |access-date=2025-08-12}}</ref>
* Floppy: clean/lubricate rails; verify WD1772; install a Gotek/FlashFloppy as a reversible drive replacement if desired.
* SIMMs: use matched 30‑pin SIMMs; reseat oxidized sockets; avoid mixed parity/non‑parity modules.
For detailed step‑by‑step procedures, see [[Atari 1040STE General Maintenance]].


== Technical Details ==
== Technical Details ==
{| class="wikitable"
{| class="wikitable styled-table" style="width:100%; text-align:center;"
! Subsystem !! ICs / part numbers !! Notes
! Subsystem !! ICs / part numbers !! Notes
|-
|-
Line 152: Line 133:
| 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>
| 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 ==
* CPU (MC68000FN8) on 16‑bit data bus.
* GST MCU arbitrates DRAM cycles among CPU, BLiTTER, floppy/ACSI DMA, and SHIFTER; audio DMA shares video path.
* Video: frame buffer in ST‑RAM; 16 palette registers (12‑bit RGB).
* Sound: YM2149F mixed with stereo DMA via LMC1992 to RCA outputs.
* Storage: WD1772 (floppy) and DMA/ACSI (DB‑19) for hard disks.
* External I/O: RS‑232 (DB‑25M), Centronics (DB‑25F), 13‑pin video, 14‑pin external floppy, 2× DE‑9 (mouse/joy), 2× DA‑15 (enhanced joysticks), 2× MIDI DIN, 40‑pin cartridge.
 
== Apple Service Manual ==
This section name is retained for template compatibility. For the Atari 1040STE, see the official Atari field service manual and schematics referenced below (no Apple documentation applies).
 
== Logic Board & Analog Board Schematics ==
For the 1040STE, the “logic board” corresponds to the main PCB assemblies listed above; analog circuitry primarily exists in the PSU and RF modulator (if fitted) and in external monitors (e.g., SM124/SC1224). Refer to:
* 520/1040STE Field Service Manual – Section Nine: Schematics and Silkscreens (CPU/BLiTTER/ROM/CLK; RS‑232/Parallel/MIDI/PSG; DMA/FDD; MCU/SHIFTER/Video; Stereo Sound/Joystick; RAM; PSU).<ref>{{cite web |url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=63 |title=Service Manual – Schematics & Silkscreens |publisher=ManualsLib |access-date=2025-08-12}}</ref>
* 1040STE C300780‑001 schematic set (see links above).<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>
 
== PCB Schematics & Service Guide ==
Motherboard revisions and identifiers (observed from service docs):
{| class="wikitable"
! Rev/Assembly !! Identifying features !! Notes/Docs
|-
| C300780‑001 Rev.A (schematic) || Early STe logic connectivity (MCU/SHIFTER/DMA sound paths) || Schematic bundle, 6 pages.<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 Schematic |publisher=Elektrotanya |access-date=2025-08-12}}</ref>
|-
| CA400340‑111 (USA W/MOD) || NTSC board with RF modulator || Parts list indicates “ASSY PCB 1040 STE USA W/MOD”.<ref>{{cite web |url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57 |title=Service Manual – Parts |publisher=ManualsLib |access-date=2025-08-12}}</ref>
|-
| CA400329‑101 (NTSC W/MOD) || Sub‑assembly with modulator/cables || As above.<ref>{{cite web |url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57 |title=Service Manual – Parts |publisher=ManualsLib |access-date=2025-08-12}}</ref>
|}
 
Service manual references:
* 520/1040STE Field Service Manual (Covers overview, theory, test flow, diagnostics, schematics).<ref>{{cite web |url=https://www.manualslib.com/manual/2170364/Atari-520ste.html |title=Atari 520STE Field Service Manual (also for 1040STE) |publisher=ManualsLib |access-date=2025-08-12}}</ref>
* 1040STE schematic sets (Internet Archive; Elektrotanya mirrors).<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><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 Schematic |publisher=Elektrotanya |access-date=2025-08-12}}</ref>
 
== Apple Service Manual ==
Not applicable. See [[#PCB Schematics & Service Manual|Atari 1040STE Service Manual]] above.
 
== Troubleshooting ==
Common field issues and remedies:
* ACSI “bad DMA” on early STE boards (C025913‑38): on some units, write operations to ACSI devices may corrupt data due to borderline RDY timing between DMA and GST MCU. Replace the DMA with C398739‑001(A) or use a proven adapter/timing‑fix; ensure PSU and cabling are sound.<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 |access-date=2025-08-12}}</ref>
* PSU ripple/sag under load: recap Mitsumi SR98/related PSUs with quality low‑ESR capacitors; check rectifier and output diodes; verify +5.00–5.10 V at mainboard under floppy load.<ref>{{cite web |url=https://www.exxosforum.co.uk/atari/last/psu/index.htm |title=The LaST Upgrade – PSU Repair |publisher=EXXOS Forum |access-date=2025-08-12}}</ref>
* Floppy read/write errors: clean heads, re‑grease rails; confirm WD1772 revision and step rate; consider Gotek for testing.
* No/weak audio on RCA: inspect LMC1992 supply and Microwire lines; verify RCA jacks and muting transistors; check that audio is not muted in software.
* No color / sync issues: confirm monitor cable wiring to Atari 13‑pin DIN (note separate H/V sync in mono vs composite sync for some displays).<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/Atari_ST_VGA_Cable_Procedures |title=Atari ST VGA/13‑pin pinout |publisher=AtariForumWiki |access-date=2025-08-12}}</ref>


== Technical Documentation ==
== Technical Documentation ==
* [[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 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 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).<ref>{{cite web |url=https://www.manualslib.com/manual/163723/Atari-St-Series.html |title=Atari ST Series Technical Reference Manual |publisher=ManualsLib |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>
* [[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 ==
<references/>
<references/>
 
[[Category:Atari Systems]]
[[Category:Computers]]
[[Category:Home computers]]
[[Category:Atari ST]]
Retrieved from "https://wiki.retrotechcollection.com/Atari_1040STE"