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.

Please feel free to upload a picture of your motherboard

Model Number Rev Model Add-ons Photo Notes Submitted by
C070243 C 520 ST+  ? C070243 Rev. C  ? Factor6
C070243 F 520 STM  ? C070243 Rev. F  ? firyembers
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 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
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 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
C070859-001 _ 1040 STF None C070789-001 Rev. C  ? push2fit
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
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
C103175 1 1040 STF None C103175 Rev. 1.1  ? push2fit
C103175 1.1 1040 STFM  ? C103175 Rev. 1.1 4bit RAM chips ppera
C100167-001 4.0 Mega ST (4MB)  ? C100167-001 Rev. 4.0 Original ROMs replaced with Flash EPROMs ppera
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 _  ? Stefan jL
CA4003290 _ 1040 STE  ? CA4003290 Rev _  ? Decky
CA401177 _ 1040 STE  ? CA401177 Rev _  ? Frank B
Unknown  ? Mega STE  ? Unknown ? ACSI-SCSI adapter is modded, and supports drives over 1GB ppera
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