Edit code in RAM one byte at a time.
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2 REM **************************
3 REM MCEDIT
4 REM **************************
10 INPUT "ENTER START ADDR OF CHNGS: ";A
20 FOR I=A TO 65367
30 PRINT I;TAB 7;PEEK I
40 INPUT "ENTER CHANGE ELSE C/R";C$: IF C$<>"" THEN POKE I,VAL C$: GO TO 30
50 NEXT INote: Type-in program listings on this website use ZMAKEBAS notation for graphics characters.