10 REM FILE TEST
20 OPEN 1, 8, 4, "TESTFILE,SEQ,W"
30 IF ST <> 0 THEN PRINT "FILE ERROR"
40 IF ST = 0 THEN PRINT "FILE EXISTS"
50 CLOSE 1

DEVICE NOT PRESENT

ERROR: #FUTHHPW8C9VAHW7YFX2LMV7OM2LM6PJZ