Texas Instruments 990 Operation Manual page 240

~----~--
~
945255-9701
Character set: As shown.
Control character functions:
1. HT prints as a space.
2.
FF prints as eight LFs.
3. CR prints as CR.
4. LF prints as LF.
5.
Characters in the range 20
16
to 7E
16
are printed as is.
6.
BEL is output as BEL.
7. BS is output as BS.
8.
All other characters are ignored.
C.2.3 733 ASR TERMINAL CASSETTE INPUT. Refer to figure C-1.
Peripheral device: 733 ASR terminal cassette input (ASCII,- direct).
Physical organization: Record, file.
Record and file ending characters:
End of record: CR.
End of file: DC3.
Character set: As shown.
Control character functions:
1. HT and FF as well as characters in the range 20
16
to 7E
16
are stored in the user's
buffer.
2. ETB is translated to CR and stored in the user's buffer.
3. CRindicates end of record. CR is not placed in the user's buffer.
4. DC3 received as the first valid character ofa record indicates end of file. When DC3 is
read, the block is restarted by performing a block forward. End of. file status is
returned after completion of the block. DC3 is riot placed in the user's buffer.
5. BEL and BS are input unchanged.
6. The sequences LF, DEL or DEL at the beginning of a record are ignored if present.
The first character following such a sequence is considered the first valid character in
the record.
C-6
Digital Systems Division