Caple C871i Manual do Utilizador descarregar pdf (Página 292)

100

101

Apple II Computer Info

Notice that each Function sub ends by setting the PSG control lines to

Inactive.

Similarly, to do a Reset (set all PSG regs to zero) ...

Reset 1016: A9 00 8D 00 C4 A9 04 8D 00 C4 60

To put the value $55 in PSG Register 02 (Channel B Freq. fine) ....

1080: A9 02 put Reg# in A

1082: 8D 01 C4 store A at the Data address ORA1

1085: 20 00 10 JSR to Set Reg# (sets "current register" to Register

1088: A9 55 put the value $55 in A

108A: 8D 01 C4 store A at the Data address ORA1

108D: 20 0B 10 JSR to Write Data ($55 goes into PSG Register 2)

1090: 60 Exit from subroutine

Good luck!

Rubywand

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Apple II Computer Technical Information : Apple II Family Hardware Info

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