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Atari coding BBS
| Falcon DMA frame counter |
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Posted by: Laurent Sallafranque
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May,31.2010-23:18
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Hello,
In Eko Demo, Eko writes to address $ff890d (frame count low).
Crossbar : $ff8901 (additional Sound DMA control) write: 0x01
Crossbar : $ff8903 (Sound frame start high) write: 0x0f
Crossbar : $ff8905 (Sound frame start med) write: 0x10
Crossbar : $ff8907 (Sound frame start low) write: 0xe8
Crossbar : $ff890d (Sound frame count low) write: 0x01
Crossbar : $ff890f (Sound frame end high) write: 0x0f
Crossbar : $ff8911 (Sound frame end med) write: 0x18
Crossbar : $ff8913 (Sound frame end low) write: 0x94
What is this write to frame count low for ?
Is it triggered like frame start and frame end or does it change immediatly the internal dma counter position ?
Are $ff890b and $ff8909 read only or read/write too ?
If I write to $ff8909, does it clear $ff890b and $ff890d ?
If I write to $ff890b, does it clear $ff890d ?
I really need these informations to complete hatari.
thanks in advance,
Best regards
Laurent
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