STOS / Reset

[mrdalliard]

Hi,

Maybe I've not been paying attention, but has anyone ever done a STOS demo that had a reset demo included?

(I'm assuming that if they did, they used ASM routines to enable it?)

Cheers,

M.

[mlynn1974]

None of the STOS demos I am aware of included a reset demo. The problem is we rely on TOS to allocate, load and release the memory where each executable is loaded. A memory resident reset demo could be over written at any time. In ASM they have more control over all that.

I think the best way would be for every demo in a multiscreen and menu demo to have a small loader routine in a memory bank and every demo screen would set the reset vector to that routine. I think that routine would need to be written in ASM.

[thomas3]

I did a "break" demo in The Interpreter Demos, where ctrl-C brought up a credits screen!

[mrdalliard]

I did a "break" demo in The Interpreter Demos, where ctrl-C brought up a credits screen!

Haha, I like this idea!

Hmmm, I think I'll have to abandon the idea of a reset demo on the basis that:

- I want it to run on a bog-standard 520 STFM and in some cases it's a bit squeaky when it comes to free memory (or even free memory banks).
- I wanted to avoid writing my own ASM. Sure, I'm using Misty/TML, but I didn't want to then write other stuff as the challenge was do it just in STOS.

Cheers,

M.

[MiggyMog]

I tinkered with such an idea before I knew about the reset vector / res valid.It was very crude and was not trapped by the reset vector but rather reloaded, and made use of a warm reboot not clearing memory. IIRC I checked a certain bit of memory and if what I had previously stored was still there it showed a digitised pic and a sample instead of the scrolltext which was shown otherwise. I had made this as an intro with some utils I was giving to my cousins then boyfriend, he had previously sent some digitised pics, one of which was of himself which I had mirrored half way through his face and it made him look like he had a mohawk...sadly I don't have the source for that one anymore which is probably just as well!

[mrdalliard]

I tinkered with such an idea before I knew about the reset vector / res valid.It was very crude and was not trapped by the reset vector but rather reloaded, and made use of a warm reboot not clearing memory. IIRC I checked a certain bit of memory and if what I had previously stored was still there it showed a digitised pic and a sample instead of the scrolltext which was shown otherwise. I had made this as an intro with some utils I was giving to my cousins then boyfriend, he had previously sent some digitised pics, one of which was of himself which I had mirrored half way through his face and it made him look like he had a mohawk...sadly I don't have the source for that one anymore which is probably just as well!

I think I'll go down this route, I think I've found a "safe" address.

Thanks,

M.