640 PRINT "*CATALOG (See current directory)": PRINT "*CAT,D2 (See directory for drive 2)": PRINT "*PREFIX (See current prefix)": PRINT "*PREFIX,D2 (Set prefix to drive 2)"
650 PRINT CHR$(25): RETURN
660 REM ERROR HANDLER
670 PRINT CHR$(4)"CLOSE": IF PEEK(222) >21 OR PEEK(222) = 16 THEN PRINT "ERROR # " PEEK(222)" IN LINE " PEEK(218) +256 * PEEK(219): GOTO 240
690 IF EF = 0 THEN HOME : PRINT "Unable to load program files.": PRINT : PRINT "The following files must all": PRINT "be in the same directory:": PRINT "NIBBLE.ASM": PRINT "NIBBLE.ASM2": PRINT "NIBBLE.ASM.ML"; CHR$(7): END
700 PRINT : PRINT PM$(ER): PRINT
710 IF EF = 2 THEN PRINT "Place disk with "PF$"NIBBLE.ASM2 in drive and press <RET>": PRINT "or press <SPACE> to abort program";: GET T$: ON (T$ = CHR$(13)) GOTO 220