Editing Atari 1040STE (section)

== 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>
|}