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. Please keep your photo to 1.5 MB, thanks.

Model Number Rev Model Add-ons Photo Notes Submitted by
C070115 2 520 ST  ?
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jokker
C070243 C 520 ST+  ?
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Factor6
C070243 E 520 STM None
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galax
C070243 F 520 STM  ?
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firyembers
C070243 H 520 STM  ?
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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  ?
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Separate Floppy/PSU, On-main-board mouse/joystick, No support for 2-chip TOS ppera
C070243 I 520 STM  ?
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As H. Support for 2-chip TOS ppera
C070523-001 C 1040 STF None
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Another with TOS under the PSU. Makes changing TOS very tedious. 1632
C070523-001 D 1040 STF None
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Swedish TOS. Zhylo
C070523-001 D  ? 20Mhz processor, Autoswitch overscan, 4MB memory, TOS 1.4/Kaos switch, HD/ED Floppy, High speed serial
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Nyh
C070523-001 D  ?  ?
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Ram chips in a row at the bottom, TOS under where the PSU normally sits exxos
C070523-001 D 520 STFM 4MB Upgrade
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floppydood
C070523-001 D 520 STFM None
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PAL 520STFM, TOS 1.02, purchased 12/86 with single-sided internal drive Dio
C070789-001 B 1040 STF None
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push2fit
C070789-001 B 520 STFM None
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roy strange
C070789-001 B 520 STFM None
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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
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insanity
C070789-001 C 520 STFM 1MB Upgrade
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insanity
C070789-001 C 520 STFM 4MB 72pin BETA Hack & test 1.44 floppy upgrade
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exxos
C070789-001 C 520 STFM 30pin 4MB hacked, Dual TOS, and prototype 1.44 floppy upgrade
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exxos
C070789-001 D 520 STFM None
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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
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push2fit
C070523-001 C 2080 STF 2MB Upgrade
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2M ST YU Board Stelios1978
C100167-001 4.0 Mega ST (4MB)  ?
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Original ROMs replaced with Flash EPROMs ppera
C100167-001 B Mega 4 Blitter patch
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2 TOS ROMS qq1975b
C100167-001 5.0 Mega ST2  ?
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jokker
C103088 C103253 3. 1. 520 STFM None
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roy strange
C103088 C103253 5. 3. 520 STFM None
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Ram chips normally where the ROM is, ROM is under the PSU. exxos
C103175 1 1040 STF None
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push2fit
C103175 1.1 1040 STFM  ?
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4bit RAM chips ppera
C103225 1 1040 STFM None
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dougforpres
C103414-001 1 520 STFM 1MB Upgrade
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Stefan jL
C103414-001 1.1 520 STFM None
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Similar to Rev. 1 above but 2-chip TOS and chip in space below labelled LS11 insanity
C103414-001 1.1 520 STFM None
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SMT for MMU & GLUE, Smaller SMT RAM chips only 4 exxos
C103999-001 B STACY None
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DarkLord
C300720-001 A TT030 None
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krupkaj
CA401146-001 H TT030 None
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krupkaj
CA401177  ? STE  ?
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Frank B
CA4003290 _ STE  ?
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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  ?
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Decky
CA4003290 _ STE  ?
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Stefan jL
Unknown  ? Mega STE  ?
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ACSI-SCSI adapter is modded, and supports drives over 1GB ppera
CA4003290 _ STE None
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The bottom side of a regular CA4003290 STE motherboard Troed



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