CO70789 - 001 REV. C1

STF motherboards.
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sandord
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CO70789 - 001 REV. C1

Post by sandord » Tue Sep 04, 2018 7:53 pm

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Re: CO70789 - 001 REV. C1

Post by sandord » Tue Sep 04, 2018 7:55 pm

I wonder what this is about:

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Re: CO70789 - 001 REV. C1

Post by sandord » Tue Sep 04, 2018 7:56 pm

Unlabeled TOS chips is also something I haven't seen before:

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Re: CO70789 - 001 REV. C1

Post by exxos » Tue Sep 04, 2018 9:51 pm

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.
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
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Re: CO70789 - 001 REV. C1

Post by rubber_jonnie » Tue Sep 04, 2018 10:25 pm

I think it needs a blitter ;)
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Re: CO70789 - 001 REV. C1

Post by sandord » Tue Sep 04, 2018 10:27 pm

It sure does 😉😉

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Re: CO70789 - 001 REV. C1

Post by Tophe38 » Wed Sep 05, 2018 8:36 am

Your TOS rom are standard part number. It's simply mask rom, not (homemade) EPROM ;)

Tophe

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Re: CO70789 - 001 REV. C1

Post by sandord » Wed Sep 05, 2018 9:12 am

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.

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Re: CO70789 - 001 REV. C1

Post by Tophe38 » Fri Sep 07, 2018 9:46 pm

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.

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Re: CO70789 - 001 REV. C1

Post by JezC » Sun Sep 01, 2019 4:29 pm

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).

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