Custom multi TOS 1.04/2.06

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gigi92
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Custom multi TOS 1.04/2.06

Post by gigi92 »

Hello Exxos, i have Exxos muti TOS chip 1.04/2.06 on my STF.

Do you think is it possible to have special version of a chip with a patch to invert floppy drive internal to B: and external to A: and so booting for external ?

I hope you can. Thanks in advance.
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exxos
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Re: Custom multi TOS 1.04/2.06

Post by exxos »

Normally people do this by swapping the drive select signals from the YM chip IIRC.
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gigi92
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Re: Custom multi TOS 1.04/2.06

Post by gigi92 »

exxos wrote: Sun Jun 30, 2024 6:16 pm Normally people do this by swapping the drive select signals from the YM chip IIRC.
I read that but it's better for me to not cut the motherboard if it's possible to do that in TOS.

You will te me if you can do that.
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Re: Custom multi TOS 1.04/2.06

Post by exxos »

gigi92 wrote: Sun Jun 30, 2024 7:36 pm I read that but it's better for me to not cut the motherboard if it's possible to do that in TOS.

You will te me if you can do that.
Me patch TOS ? I am the wrong person to ask that. While I patched TOS for ST536 it took a very long time to figure out, and that was with the routines I needed already within TOS. I would have to charge for all my time involved to do such things, which would likely run up to 4 figures. But I don't think it's a good idea, as it would likely only work for clean GEM apps anyway.
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.
gigi92
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Re: Custom multi TOS 1.04/2.06

Post by gigi92 »

i understant , thanks for thinking.

i also read on stf : W2 on board for change external drive to DS1 (pin 2-3) to DS0 (pin 1-2) signal to pin 5.
And change on internal floppy drive jumper for DS0 (default) to DS1.

do you know this "W2" ?
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Re: Custom multi TOS 1.04/2.06

Post by rubber_jonnie »

@gigi92

I think what you're asking is impractical and out of the scope of what's possible through this forum or the store.

Essentially you're asking for two versions of TOS that allow you to select which drive to boot from on demand.

It's a lot of work for anyone to undertake, especially for one request.

If you aren't prepared or able to do the hardware mod, I'd suggest that you have a look over at 8bitchip.info as PPera does have some custom versions of TOS and may be able to help.


BTW I did this specific mod here: https://www.exxosforum.co.uk/forum/vie ... start=190
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Re: Custom multi TOS 1.04/2.06

Post by chronicthehedgehog »

AFAIK, some games may also implement their own low level disk access, avoiding the TOS calls. So doing it in software wouldn't work 100% of the time anyway
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