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CO70789 - 001 REV. C1
Re: CO70789 - 001 REV. C1
I wonder what this is about:
- 1.jpg (92.34 KiB) Viewed 14018 times
Re: CO70789 - 001 REV. C1
Unlabeled TOS chips is also something I haven't seen before:
- 2.jpg (291.37 KiB) Viewed 14018 times
Re: CO70789 - 001 REV. C1
Its common bodge.. I think Atari missed 5V off a chip or something.. did look into it but cant exactly remember.
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rubber_jonnie
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Re: CO70789 - 001 REV. C1
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...
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...
Re: CO70789 - 001 REV. C1
It sure does 
Re: CO70789 - 001 REV. C1
Your TOS rom are standard part number. It's simply mask rom, not (homemade) EPROM
Tophe
Tophe
Re: CO70789 - 001 REV. C1
So that must mean that most roms I have seen were upgrades.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
Re: CO70789 - 001 REV. C1
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.
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
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).
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).