exxos's Atari, Amiga & retro forum

exxos wrote: 09 Oct 2019 10:17 Would ROM access speed likely break anything demo or game wise that you know of ?

It will break stuff, but it would be unknown exactly what and how many until tested. Also I think it would mostly be copy protections breaking.

/Troed

Does anyone know if demos run on suska, such as ones which do fullscreen by 50/60hz switching etc ?

If I'm not wrong, Suska isn't cycle exact

Cyprian wrote: 10 Feb 2020 00:56 If I'm not wrong, Suska isn't cycle exact

Its not no.. But mostly wondering if anyone knows if it will do 50hz and 60hz even on desktop.

Does someone know if suska had 14mb ST ram ? I seem to recall it did . But I can't remember or remember what TOS version it has.

Or does anyone know if any machines, other than the falcon, supported more than 4mb ST RAM ?

exxos wrote: 19 May 2024 16:35 Or does anyone know if any machines, other than the falcon, supported more than 4mb ST RAM ?

I know that Atari TT can have e.g. 10MB ST-RAM

ST/STE SHIFTER/MMU are limited to 4MB

Cyprian wrote: 19 May 2024 20:17 I know that Atari TT can have e.g. 10MB ST-RAM

ST/STE SHIFTER/MMU are limited to 4MB

Yeah they limited by hardware. Though I was more thinking what TOS version had more than 4MB. Not sure what OS the TT has , assume 306 ?

exxos wrote: 19 May 2024 21:01

Cyprian wrote: 19 May 2024 20:17 I know that Atari TT can have e.g. 10MB ST-RAM

ST/STE SHIFTER/MMU are limited to 4MB

Yeah they limited by hardware. Though I was more thinking what TOS version had more than 4MB. Not sure what OS the TT has , assume 306 ?

There is 'Maddalt' function: https://freemint.github.io/tos.hyp/en/g ... ml#Maddalt
" »Inform GEMDOS of alternative memory« - Register 'Alternative' RAM with GEMDOS. "
It is used to add more than 4 RAM to the TOS memory pool and it was implemented in GEMDOS 0.19 (TOS 2.x)

Cyprian wrote: 19 May 2024 21:26 There is 'Maddalt' function: https://freemint.github.io/tos.hyp/en/g ... ml#Maddalt
" »Inform GEMDOS of alternative memory« - Register 'Alternative' RAM with GEMDOS. "
It is used to add more than 4 RAM to the TOS memory pool and it was implemented in GEMDOS 0.19 (TOS 2.x)

Yes indeed, but normally that is alt-ram whch is bolted onto the 68000 and needs PRG flags set. But what I am talking about is, pure ST RAM. In that would TOS itself see more than 4MB if it was installed..

Thinking about it, you normally have to boot the system without alt-ram enabled because TOS would try and allocate video RAM in alt-ram which results in a black screen. So then Maddalt is used to allocate the RAM and the shifter still gets limited to 4MB. It is a bit messy.. But this to me basically insinuates that TOS does actually check for more than 4MB STRAM.