10  *= $600
20  LDX #$2C
30  LDY #0
40  STY $CB
50  LDA #$50
60  STA $CC
70  LDA #$90
80  STA $CD
90 INTM1 LDA ($CB),Y
0100  EOR $CD
0110  CLC
0120  ADC $CD
0130  STA ($CB),Y
0140  INC $CD
0150  INC $CD
0160  INY
0170  BNE INTM1
0180  INC $CC
0190  DEX
0200  BNE INTM1
0210  BRK
