|[hatari-devel] SCSI DMA Control|
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I've found that looking at the Hatari code is often a useful way of
understanding how real hardware works, although of course I realise that it may
not always be 100% accurate.
I have been trying to figure out why bit 7 of 0xff8715 on a real TT is set
(that's part of SCSI DMA control). However, I couldn't find anywhere in Hatari
that sets it. So I have 2 questions:
(1) did I miss something?
(2) even if Hatari never sets it, apparently real hardware does set it
sometimes. Does anyone know the conditions that would set this bit? I looked
in the TT030 Hardware Reference Manual, but all it said was that it is only set
by reads, and it is cleared by a read.