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CO70789 - 001 REV. C1

Posted: Tue Sep 04, 2018 7:53 pm
by sandord
IMG_20180904_205018.jpg
IMG_20180904_205018.jpg (3.13 MiB) Viewed 9656 times

Re: CO70789 - 001 REV. C1

Posted: Tue Sep 04, 2018 7:55 pm
by sandord
I wonder what this is about:

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Re: CO70789 - 001 REV. C1

Posted: Tue Sep 04, 2018 7:56 pm
by sandord
Unlabeled TOS chips is also something I haven't seen before:

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Re: CO70789 - 001 REV. C1

Posted: Tue Sep 04, 2018 9:51 pm
by exxos
sandord wrote: Tue Sep 04, 2018 7:55 pm I wonder what this is about:
Its common bodge.. I think Atari missed 5V off a chip or something.. did look into it but cant exactly remember.

Re: CO70789 - 001 REV. C1

Posted: Tue Sep 04, 2018 10:25 pm
by rubber_jonnie
I think it needs a blitter ;)

Re: CO70789 - 001 REV. C1

Posted: Tue Sep 04, 2018 10:27 pm
by sandord
It sure does 😉😉

Re: CO70789 - 001 REV. C1

Posted: Wed Sep 05, 2018 8:36 am
by Tophe38
Your TOS rom are standard part number. It's simply mask rom, not (homemade) EPROM ;)

Tophe

Re: CO70789 - 001 REV. C1

Posted: Wed Sep 05, 2018 9:12 am
by sandord
Tophe38 wrote: Wed Sep 05, 2018 8:36 am Your TOS rom are standard part number. It's simply mask rom, not (homemade) EPROM ;)

Tophe
So that must mean that most roms I have seen were upgrades.

Re: CO70789 - 001 REV. C1

Posted: Fri Sep 07, 2018 9:46 pm
by Tophe38
If it's EPROM with sticker on glass, yes it is.
It's easy and cheap and legal. I have done it on all my STE, even with a switch to change between 1.62 and 2.06.

Re: CO70789 - 001 REV. C1

Posted: Sun Sep 01, 2019 4:29 pm
by JezC
Just noticed that one of my 1040 STFs has this PCB but has TOS 1.00 in 6x ROMs fitted...all my other STFs have the C707523 motherboards.

That's the first of my C070789 boards without the modulator & with TOS 1.00 (the others all have 2x chip TOS 1.02) so I'm guessing that this was probably a late 1040 STF (shortly before the 1040 STFM was released)?

It's still a long eject button model.

The only problem with the system is that the floppy eject spring seems to be weak (so the drive only stays in the eject position for a few seconds & then it sticks the eject button out again)...a bit of a hassle but nothing too serious (just yet).