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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

ILLEGAL DEVICE NUMBER

ERROR: #B37JN39DD4F0RLT5F6NWUY54RKCR1L49