Compilation of small questions

evangeline

The error I got when assembling the program was Must have instruction after prefix
What does it mean

www_james

The source program is not the same as the debug. The prefix and the modified instructions in the source program are together, such as rep movsw. The debug is displayed as two instruction lines:
-a 100
1375: 0100 rep movsw
1375: 0102
-r
AX = 0000 BX = 0000 CX = 0000 DX = 0000 SP = FFEE BP = 0000 SI = 0000 DI = 0000
DS = 1375 ES = 1375 SS = 1375 CS = 1375 IP = 0100 NV UP EI PL NZ NA PO NC
1375: 0100 F3 REPZ
1375: 0101 A5 MOVSW