C070115 REV.2B (520ST 08/1985)

ST & STM motherboards.
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ZeroG1972
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C070115 REV.2B (520ST 08/1985)

Post by ZeroG1972 » Sun Oct 28, 2018 8:55 pm

Atari 520 ST (AZERTY / French Keyboard) without TOS (08/1985)

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troed
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Re: C070115 REV.2B (520ST 08/1985)

Post by troed » Sun Oct 28, 2018 10:31 pm

No vias for filters. Not sure I've seen that on any other ST motherboard revision before.

(Has there been a Shifter can on that at all? Seems to have the mounts but cleanly removed if so)

Chip revisions seems to be the same as on my REV.B - but this is surely an earlier revision since they added loads of filters in between those two versions. If I were to guess at the date stamp on the REV.B, it's 10 1985 so only two months difference.

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Re: C070115 REV.2B (520ST 08/1985)

Post by exxos » Sun Oct 28, 2018 10:40 pm

troed wrote:
Sun Oct 28, 2018 10:31 pm
No vias for filters. Not sure I've seen that on any other ST motherboard revision before.
Isn't the -38 the shifter the one you was on about ? (can't remember off-hand sorry)
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Re: C070115 REV.2B (520ST 08/1985)

Post by troed » Sun Oct 28, 2018 10:42 pm

exxos wrote:
Sun Oct 28, 2018 10:40 pm
Isn't the -38 the shifter the one you was on about ? (can't remember off-hand sorry)
Yes - and my REV.B has one as well :) This seems to be a revision from just before that one. Interesting that "2B" comes before "B".

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Re: C070115 REV.2B (520ST 08/1985)

Post by troed » Sun Oct 28, 2018 10:43 pm

This one doesn't have the CSYNC patch for non -M versions. Very interesting revision this :)
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Re: C070115 REV.2B (520ST 08/1985)

Post by exxos » Sun Oct 28, 2018 10:44 pm

Maybe its one of the very early machines produced ?
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

troed
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Re: C070115 REV.2B (520ST 08/1985)

Post by troed » Sun Oct 28, 2018 10:47 pm

exxos wrote:
Sun Oct 28, 2018 10:44 pm
Maybe its one of the very early machines produced ?
Yeah compare this motherboard with all the other ST(M) revisions posted on this board. Many many differences, not just the filters. Also the coil by the power connector. No "motherboard cap" near RAM etc.

duh: Scrap that about 2B before B - it's the only non-C070243 motherboard posted even!

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Re: C070115 REV.2B (520ST 08/1985)

Post by ZeroG1972 » Wed Oct 31, 2018 8:46 pm

troed wrote:
Sun Oct 28, 2018 10:43 pm
This one doesn't have the CSYNC patch for non -M versions. Very interesting revision this :)
No, it does not have a composite sync.
It works well with a monochrome monitor SM124 but not SCART with SC1425: the screen is out of sync.
I found an article of ST Magazine (in French) of October 1986 which speaks about it:

http://download.abandonware.org/magazin ... age046.JPG

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