Commodore 1581 - File Status Variable Meanings

POSSIBLE VALUES OF THE FILE STATUS VARIABLE
IFST =
0
1
2
4
8
16
32
64
128
"ST," AND THEIR MEANINGS
THEN
All is OK
Receiving device was not available
(time out on talker)
Transmitting device was not available
(time out on listener)
Cassette data file block was too short
Cassette data file block was too long
Unrecoverable read error from cassette, verify error
Cassette checksum error—one or more faulty
characters were read
End of file reached (EOI detected)
Device not present, or end of tape mark found
on cassette
50