Changes
/* Automatic feeding of sound generator */
*0RDDh LOAD R,DD Load 8 bit data DD to PSG register R (0R015)
*1NNNh PAUSE N Pause for N prescaled ticks (0<No4095N < 4095)*2NNNh REPEAT N Set loop counter to N for this stream (0<No4095N < 4095)and mark next instruction as loop start.
*3xxxh (reserved) Do not use
*4000h NOP No operation (64us 64 us idle)
*4001h LOOP If loop counter non zero, loop back to the first instruction after REPEAT instruction and decrement loop counter.
*4010h INT Interrupt the CPU (see section 2.7 below)
