C070243 REV.C - Atari 260ST (1Mb) - Strange

ST & STM motherboards.
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C070243 REV.C - Atari 260ST (1Mb) - Strange

Post by Marsupilami » Fri Jan 17, 2020 8:23 pm

Here's my sealed German 260ST with...1MB :o !
I don't know if Atari really did it or if it's an fake seal.
And i thought that the 260ST had a Tos only in floppy, so why do i have a 6 chip TOS 1.0 ROM in this one ?
What is the A870..DH number ?
What is this -38 shifter and what are de differences with the -38A ?
A lot of mystery :lol:
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Re: C070243 REV.C - Atari 260ST (1Mb) - Strange

Post by exxos » Fri Jan 17, 2020 8:45 pm

I have seen neat RAM jobs like that before in some machines, as to if Atari did that model or not, no idea.

Assuming it has been upgraded at some point, I would also assume the boot ROMs have been changed for proper OS ROMs.
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Re: C070243 REV.C - Atari 260ST (1Mb) - Strange

Post by TimNaber » Fri Jan 17, 2020 9:12 pm

Regarding the memory: I have a Mega 4 that has that kind of RAM upgrade in it. The motherboard only had two rows to be able to install memory. The other two rows are missing.

1. Could have been a user upgraded Mega 2 board inserted into a Mega 4 case.
2. Could have been done at the factory when they ran out of Mega 4 boards, then they used Mega 2s and upgraded them.

I do like the professional look of those upgrades though.
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Re: C070243 REV.C - Atari 260ST (1Mb) - Strange

Post by frank.lukas » Fri Jan 17, 2020 9:25 pm

every dealer had such seals

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Re: C070243 REV.C - Atari 260ST (1Mb) - Strange

Post by derkom » Fri Jan 17, 2020 10:45 pm

My (also German) 260ST has a very similar looking 1 MB upgrade in it...

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However, it never got TOS ROMs, and still has the floppy boot ROMs. :geek:

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Yes, I have cleaned it since these photos were taken. :)

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Re: C070243 REV.C - Atari 260ST (1Mb) - Strange

Post by rubber_jonnie » Sat Jan 18, 2020 10:03 am

Not uncommon, mine is documented here: viewtopic.php?f=53&t=1379

Mine had memory issues, and removing the piggyback RAM fixed it, until I then cleaned up the pins afterwards and it died. Works well with a Marpet style upgrade, and I'm sure one of exxos' MMU/SHIFTER style upgrades would give it a nice boost to 4MB.

Mine also has TOS in ROM.

I reckon as Frank says, that's just a dealer sticker.
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Re: C070243 REV.C - Atari 260ST (1Mb) - Strange

Post by Atarian Computing » Sat Jan 18, 2020 5:07 pm

This is a RAM upgrade that Atari has known to do themselves. Whether it's through a dealer, I don't know. All I know from various sources is that it was an upgrade sanctioned by Atari, and one that I've done myself several times.

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