On Thu, 21 Mar 2002 09:17:50 +1100, you wrote:
>Personally I find it rather odd the read/modify/write of VSYNCH and WSYNC)
>I'd just set or clear the bit with a direct write, myself.
>
>It's never actually occurred to me during my programming, but are the
>hardware registers (VSYNCH, WSYNCH, etc. reliably readable)? I would have
>expected to have used shadow registers in RAM and always write the shadow
>values to the HW regs when modifying regs.
No -- when you read a hardware register, you get a collision register, which
are from $00 to $0E and are mirrored at every %0xxx0000.
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