[hatari-devel] Small test to run on STE

Nicolas Pomarède npomarede at corp.free.fr
Mon Feb 13 09:53:22 CET 2012


Le 13/02/2012 00:00, Konador, Cyprian a écrit :
> $3F on my 4MB STe
>
> Attached you can find test program and source code
>
> BR
> Cyprian

Thanks to you and roger burrows, this indeed looks like hi byte of the 
screen address is masked with the RAM's size.

Maybe someone with a 1MB or 2MB STE here could try cyprian's test 
program to be sure we get different values ?

Nicolas


>
> -----Original Message-----
> From: hatari-devel-bounces at lists.berlios.de [mailto:hatari-devel-bounces at lists.berlios.de] On Behalf Of Nicolas Pomarède
> Sent: Sunday, February 12, 2012 12:11 PM
> To: Mailing list for Hatari developers
> Subject: Re: [hatari-devel] Small test to run on STE
>
> 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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