Atari ST disk TOS

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Jul 022011

My mate Sophie wanted some EPROMs burning of the early TOS version for the Atari ST.
This version boots TOS from a disk rather than being “on-chip”.
I was given a couple of links to and read how others had done it.
Because the ROM dump is only 16k and we want it on a 27c256 EPROM, we have to byte split the file into HI and LO and copy each file into itself 4 times.
Using the Windows command prompt you can type:
“copy /b disktos.lo+disktos.lo+disktos.lo+disktos.lo disktos256.lo”, and same goes for the HI file.

I originally tried this out on my STe and set the jumpers accordingly which allegedly allow a 27c256 eprom to be used but this now seems incorrect.
To throw me further in confusion, one of the EPROMs must have died somewhere between my house and my mates because it didnt work.

Feeling a bit deflated I sent an email off to user 1632 who originally started the post, asking if he could send me his files. He very kindly dumped his eproms and sent me them but they matched the ones I originally created.
All I could think of doing was burning them again and sending them off. This time they worked so a dodgy EPROM was the cause all along.

You can find the original forum post here


Thanks go to Mike (1632) for his help with this. I would have spent a lot of time looking in the wrong place without his help.