But first, thanks to the people who had a copy of my
.zip file.

Today I learned...

If you enable p3int, the VMU wakes up faster from
sleep.
...
If you enable p3int and don't process it, button
response is
not good.
...
The firmware sleep routine enables p3int.

mcr and vccr can be turned off with bit instructions,
but
want mov instructions to turn back on.

In a very quiet room, if you hold it to your ear, you
can
hear a sleeping VMU ticking. If you hold down a key,
it
will buzz.

Things would be a lot easier for me if Sega had
released
complete specs for the VMU - especially for all the
SFRs.
The websites I can find with info don't match up in
many
places. The source code I have found is at best, less
than
optimal - likely due to inadequate information.

MY VMUs clock at 6.051MHz, 870KHz, and 32.2KHz -
The emulators clock at 3.6MHz, 3.6MHz, and 19.6KHz.

Does anyone know....

If you can use P1 like a parallel port?
If you can set VSEL for auto-decrement?
Any fun hardware things to do with a VMU?

Harry





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