System information

A>DDT SCAN. HEX Start debugger using hex format machine code
DDT VER 1.0
NEXT PC Next instruction
0121 0000 to execute at
-X PC = 0
|
COZOMOEOIO A=00 B=0000 D=0000 H=0000 S=0000 P=0000 OUT 7F
-XP \ Examine registers before debug run
P=0000 100 Change PC to 100
-X Look at registers again
COZOMOEOIO A=00 B=0000 D=0000 H=0000 S=0100 P=00120 MVI B,08
-L100
PC changed Next instruction
to execute at PC = 100
0100 MVI B,08
0112 MVI C,00
0104 LXI H,0119
0107 MOV A,M
0108 SUB C
0109 JNC 010D
010C MOV C,A
010D INX H
010E DCR B
010F JNZ 0107
0112 MOV A,C
-L
4.4 A Sample Program CP/M Operating System Manual
4-15