1040 STFM upgrade to TOS 1.04 two chips

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naujoks
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1040 STFM upgrade to TOS 1.04 two chips

Post by naujoks »

I'd like to upgrade my 1040 STFM's TOS to 1.04.
It has TOS on two PROMs (28 pins).

Could someone please tell me which kind of EPROMs I need to use?
thesofa2
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Re: 1040 STFM upgrade to TOS 1.04 two chips

Post by thesofa2 »

If you go to Exxoss's site https://www.exxoshost.co.uk/atari/store2/ and click on rom, then scroll down you will find TOS 1.04 ROMs. I have bought a good few bits and pieces from the site, he is very good at fast delivery and all the bits I bought from him have worked first time. His prices are good too and his boards are superb.
TT030 with Storm with 256 Mb Ram, Thunder with a CF drive and Lightning, HxC floppy emulator and one of Codekiller's magical Mono/Colour switchers, 1040 STE, upgraded to 4 MB and fitted with switchable dual TOS, also 3 STS one has TOS1.0 AND 2.06 switchable with an HD drive, the other two are untested as yet, just bought for spares!!
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DoG
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Re: 1040 STFM upgrade to TOS 1.04 two chips

Post by DoG »

There isn't any eprom that has 28 legs that will just plug in. You use 2 pcs of 27C010 or 27C1001 (or 29CXXXX). Either you buy something like a 28to32 pin adapter board or mod the eproms your self.

Or you convert your motherboard to use 6 roms instead and use 27C256 that will just slot in.

Depending on your board revision and layout you can also buy ready made stuff.
naujoks
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Re: 1040 STFM upgrade to TOS 1.04 two chips

Post by naujoks »

I have 27C1001 EPROMS. What do I need to do to mod them?
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DoG
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Re: 1040 STFM upgrade to TOS 1.04 two chips

Post by DoG »

naujoks wrote: Sat Oct 16, 2021 9:18 pm I have 27C1001 EPROMS. What do I need to do to mod them?
Here is the best I could find at the moment.
naujoks
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Re: 1040 STFM upgrade to TOS 1.04 two chips

Post by naujoks »

Thank you, that looks doable.
The ROM image splitter that I found splits the 192kb file into two parts of 96kb each. Does that sound right?
naujoks
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Re: 1040 STFM upgrade to TOS 1.04 two chips

Post by naujoks »

I got everything working now. Thanks for your help!
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