C103277- REV.2.2 (other)

MEGA ST motherboards.
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C103277- REV.2.2 (other)

Post by Marsupilami » Fri Jun 21, 2019 1:03 pm

Found this one in a garage sale last week with a megafile30 for...50€ 8-)

6xTOS (v1.02) and a strange black cable between C100110 and MB.
Almost everything is socketed.
The RAM banks are DILL-DRAM (not SMTs like this one).
Now i need to upgrade RAM to 4Mb and TOS. But i'm sure Exxos will have good advices for me ;)
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Re: C103277- REV.2.2 (other)

Post by exxos » Fri Jun 21, 2019 1:11 pm


Yeah various people do various hacks to upgrade the RAM.. The kit I sell which would work is this one. https://www.exxoshost.co.uk/atari/last/storenew/#0035
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: C103277- REV.2.2 (other)

Post by DoG » Fri Jun 21, 2019 1:18 pm

That black wire is from factory. Looks like mine, but I got two chip TOS version. U12 needs a chip (SN74LS) and move W2 and W3 to the middle-right position. And remove W4. Easier to get TOS 1.04 on 6 chips.

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Re: C103277- REV.2.2 (other)

Post by PhilC » Fri Jun 21, 2019 1:30 pm

Looks pretty clean to me, nice find.

The ram upgrade exxos mentioned is probably the easiest to fit as long as you can solder up the shifter adaptor.

There are other options but they aren't as straight forward. Such as dip to smt ram adaptors and robbing some smt chips from something like an 8mb 64pin sim but obviously much more complicated.
If it ain't broke, test it to Destruction.

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