Texas Instruments 990 Operation Manual page 241

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945255-9701
7.
In direct mode, the contents of a physical block on tape are transferred to the user's
buffer without conversion. Parity bits are reset.
C.2.4 733 ASR TERMINAL CASSETTE OUTPUT. Refer to figure C-I.
Peripheral device: 733 ASR terminal cassette output (ASCII, direct).
Physical organization: Record, file.
Record and file ending characters:
End of record: Depletion of character count (83 characters maximum).
End of file: DC3.
Character set: As shown.
Control character functions:
I. HT, FF and characters in the range 20
16
to 7E
16
are output as is.
2. CR in the user's buffer is translated to ETB and output.
3. End of block character sequence is CR, LF, DC4, DEL. These characters are auto-
matically output to control the cassette and are not user data characters.
4. BEL and BS are output unchanged.
5. End of file character sequence is DC3, CR, DC4, DEL.
6. DC3 is allowed wjithin a record for compatibility with
sta~d-alone
software. It may not
be written, however, as the first data character
in
the record.
C-7/C-8
Digital Systems Division .