[hatari-devel] Small test to run on STE

Nicolas Pomarède npomarede at corp.free.fr
Sun Feb 12 12:11:14 CET 2012


On 14/11/2011 22:55, Nicolas Pomarède wrote:
> Hello
>
> I'm wondering if the video address on STE is masked depending on the RAM
> size ; could someone with an STE runs this small program and tell me the
> result of D0 and D1 (you need to be in supervisor mode) :
>
> stop $2300
> stop $2300
> move.b $ff8205,d0
> move.b #$ff,$ff8205
> move.b $ff8205,d1
> move.b d0,$ff8205
>
> This will briefly modify the video address high byte and restore it.
> But I'm wondering if you will read $ff after writing it to $ff8205, or
> if it will be masked depending on the max size of 4 MB (and you would
> read $03 for example).
>
> Anders maybe ? ;-)
>
> Thanks
>
> Nicolas

Ping :)

Anyone with an STE that would be able to run this small test from devpac 
or another asm ?

Thanks



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