CO70789 - 001 REV. C1

STF motherboards.
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sandord
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CO70789 - 001 REV. C1

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Re: CO70789 - 001 REV. C1

Post by sandord »

I wonder what this is about:

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sandord
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Re: CO70789 - 001 REV. C1

Post by sandord »

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

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exxos
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Re: CO70789 - 001 REV. C1

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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.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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Re: CO70789 - 001 REV. C1

Post by rubber_jonnie »

I think it needs a blitter ;)
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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Re: CO70789 - 001 REV. C1

Post by sandord »

It sure does 😉😉
Tophe38
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Re: CO70789 - 001 REV. C1

Post by Tophe38 »

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 »

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 »

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 »

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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