Atari ST motherboard revisions

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Atari ST motherboard revisions


The Atari ST went through a fair amount of revisions during its lifetime.

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Model Number Rev Model Add-ons Photo Notes Submitted by
C070115 2 520 ST ? C070115 Rev. 2 jokker
C070243 C 520 ST+ ? C070243 Rev. C Factor6
C070243 F 520 STM ? C070243 Rev. F firyembers
C070243 H 520 STM ? C070243 Rev. H PAL 520STM, thought to be original. Looks to have been made in early to mid 1987 - sticker (Silica Shop? My STFM had the same type) on the bottom said 12/87 so it may have sat in inventory for a bit. Dio
C070243 H 520 STM ? C070243 Rev. H Separate Floppy/PSU, On-main-board mouse/joystick, No support for 2-chip TOS ppera
C070243 I 520 STM ? C070243 Rev. I As H. Support for 2-chip TOS ppera
C070523-001 C 1040 STF None C070523 Rev. C Another with TOS under the PSU. Makes changing TOS very tedious. 1632
C070523-001 D 1040 STF None C070523 Rev. D Swedish TOS. Zhylo
C070523-001 D ? 20Mhz processor, Autoswitch overscan, 4MB memory, TOS 1.4/Kaos switch, HD/ED Floppy, High speed serial C070523-001 Rev. D Nyh
C070523-001 D ? ? C070523-001 Rev. D Ram chips in a row at the bottom, TOS under where the PSU normally sits exxos
C070523-001 D 520 STFM 4MB Upgrade C070523-001 Rev. D floppydood
C070523-001 D 520 STFM None C070523-001 Rev. D PAL 520STFM, TOS 1.02, purchased 12/86 with single-sided internal drive Dio
C070789-001 B 1040 STF None C070789-001 Rev. B push2fit
C070789-001 B 520 STFM None C070789-001 Rev. B roy strange
C070789-001 B 520 STFM None C070789-001 Rev. B PAL 520STFM, late 87. Not quite original; has a yellow/green LED keyboard but a red/red top cover, and the drive hole has been filed around, so presumably was SS and swapped to DS. Doesn't look to have any mods though. Dio
C070789-001 C 520 STFM None C070789-001 Rev. C insanity
C070789-001 C 520 STFM 1MB Upgrade C070789-001 Rev. C insanity
C070789-001 C 520 STFM 4MB 72pin BETA Hack & test 1.44 floppy upgrade C070789-001 Rev. C exxos
C070789-001 C 520 STFM 30pin 4MB hacked, Dual TOS, and prototype 1.44 floppy upgrade C070789-001 Rev. C exxos
C070789-001 D 520 STFM None C070789-001 Rev. B PAL 520STFM. Serial number indicates 1988 or 89 - surprisingly late for this board layout, the custom chips have the iMP logo. Ribbon cables are for the half meg RAM expansion. Floppy drive looks to be original and is DS. Dio
C070859-001 _ 1040 STF None C070789-001 Rev. C push2fit
C100167-001 4.0 Mega ST (4MB) ? C100167-001 Rev. 4.0 Original ROMs replaced with Flash EPROMs ppera
C100167-001 B Mega 4 Goldstar GD74LS74A 8948 on top of the CPU and soldered to 7 central pins of the CPU C100167-001 Rev. B 2 TOS ROMS qq1975b
C100167-001 5.0 Mega ST2 ? C100167-001 Rev. 5.0 jokker
C103088 C103253 3. 1. 520 STFM None C103088 Rev. 3 C103253 Rev. 1 roy strange
C103088 C103253 5. 3. 520 STFM None C103088 Rev. 5 C103253 Rev. 3 Ram chips normally where the ROM is, ROM is under the PSU. exxos
C103175 1 1040 STF None C103175 Rev. 1.1 push2fit
C103175 1.1 1040 STFM ? C103175 Rev. 1.1 4bit RAM chips ppera
C103225 1 1040 STFM None C103225 Rev 1 dougforpres
C103414-001 1 520 STFM 1MB Upgrade C103414-001 Rev. 1 Stefan jL
C103414-001 1.1 520 STFM None C103414 Rev. 1.1 Similar to Rev. 1 above but 2-chip TOS and chip in space below labelled LS11 insanity
C103414-001 1.1 520 STFM None C103414 Rev. 1.1 SMT for MMU & GLUE, Smaller SMT RAM chips only 4 exxos
C103999-001 B STACY None C103999-001 Rev. B DarkLord
C300720-001 A TT030 None C300720-001 Rev A krupkaj
CA401146-001 H TT030 None CA401146-001 Rev H krupkaj
CA401177 ? STE ? CA401177 Rev ? Frank B
CA4003290 _ STE ? CA4003290 Rev _ Small board at top, right is HD floppy circuit. There is IDE IF too, with experimental hot-swap support, therefore so many chips soldered. ppera
CA4003290 ? STE ? CA4003290 Rev ? Decky
CA4003290 _ STE ? CA4003290 Rev _ Stefan jL
Unknown ? Mega STE ? Unknown ? ACSI-SCSI adapter is modded, and supports drives over 1GB ppera



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