Changes
/* 8255 */
===8255===
* When switching port A of ASICs emulated 8255 to input, FF is present on the emulated 8255's port A outputs.
This will cause FF to be output and an invalid PSG register to be selected:
ld bc,&f400
ld bc,&f792
out (c),c
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;; At this point FF appears in
Therefore use this:
ld bc,&f792
out (c),c
* When switching input/output of port A, on a normal 8255, the outputs are all cleared to 0. This doesn't happen on the emulated 8255. This is another source of keyboard reading bugs.
===Automatic feeding of sound generator===
