Changes

 == Programming Examples== === Reading a value from a PSG register. === 

ld b,&f4 ;} Setup register index on PPI port Aout (c),c ;}

ld bc,&f6c0 ;} Tell PSG to select register using data on PPI port Aout (c),c ;}

ld bc,&f600 ;} Put PSG into inactive stateout (c),c ;

;** Set PPI port A to input mode. **

ld c,%10010010 ; mode and port configurationout (c),c ; Port A input, Port B input, Port C output ; All operating in mode 0. (see Programming ; 8255 PPI)

ld bc,&f640 ;} Tell PSG to put the data of the selected register to PPI port A toout (c),c ;}

ld b,&f4 ;} Read data from PPI port Ain a,(c) ;}

;** Set PPI port A to output mode. *ld b,&f7 ;8255 PPI control

out (c),c ;Port A output, Port B input, Port C output

ld bc,&f600 ;} Return PSG to inactive mode.out (c),c ;}