Commodore 128 Programmer's Reference Manual page 434

424 COMMODORE 128
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15. $FFAB UNTLK ;serial: send untalk
PREPARATION:
Registers: none
Memory: system map
Flags: none
Calls: none
RESULTS:
Registers: .A used
Memory: STATUS ($90)
Flags: none
EXAMPLE: U
JSR $FFAB ;UNTALK serial device
UNTLK is a low-level Kernal serial bus routine that sends an UNTALK
command to all serial bus devices. It commands all TALKing devices to stop
sending data. (Most applications should use the higher-level I/O routines; see
CLRCH.)
16. $FFAE UNLSN ;serial: send unlisten
PREPARATION: j I
Registers: none LJ
Memory: system map
Flags: none i i
Calls: none |J
RESULTS:
Registers: .A used
Memory: STATUS ($90)
Hags: none
EXAMPLE:
JSR $FFAE ;UNLISTEN serial device
UNLSN is a low-level Kernal serial bus routine that sends an UNLISTEN
command to all serial bus devices. It commands all LISTENing devices to stop
reading data. (Most applications should use the higher-level I/O routines; see
ICLRCH.)
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