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TOS 1.04 Upgrade for STFM C070523 Rev D

Posted: 03 May 2026 22:46
by ChrisA
Hi,

Hopefully an easy question on my STFM before I order the 1.04 TOS upgrade. Am I correct in thinking my board has the 6 ROM TOS chips under the PSU (on the left) and are not the two larger chips next to each other under the floppy drive (on the right)? - I don't see HI and LO written anywhere.

Here's a picture of it to aid diagnosis.
IMG_9254_2.jpeg
Thanks,
Chris

Re: TOS 1.04 Upgrade for STFM C070523 Rev D

Posted: 03 May 2026 22:50
by exxos
You have "6 chip TOS" on that board. Yes under the PSU.

https://www.exxosforum.co.uk/atari/last ... m#TOS6CHIP

Re: TOS 1.04 Upgrade for STFM C070523 Rev D

Posted: 03 May 2026 22:59
by ChrisA
Wow :shock: That was a quick response. Thanks very much. I figured everyone would be in bed now. I'll order the ROM upgrade at the same time as the RAM upgrade. :D

Re: TOS 1.04 Upgrade for STFM C070523 Rev D

Posted: 04 May 2026 00:56
by exxos
Yeah 1am.. I don't sleep much, probably why im always cranky :)

Thanks for your order !