Commodore 128 Programmer's Reference Manual page 428

418 COMMODORE 128
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6. $FF90 SETMSG ;Kernal messages on/off
PREPARATION: j
Registers: .A = message control ^J
Memory: system map
Hags: none j j
Calls: none |J
RESULTS:
Registers: none \
Memory: MSGFLG ($9D) updated {j
Flags: none
EXAMPLE: j
LDA #0 U
JSR $FF90 ;turn OFF all Kernal messages
SETMSG updates the Kernal message flag byte MSGFLG ($9D) that deter- U
mines whether system error and/or control messages will be displayed. BASIC
normally disables error messages always and disables control messages in Run [ i
mode. Note that the Kernal error messages are not the verbose ones printed by j
BASIC, but simply the I/O ERROR # message that you see when in the Monitor,
for example. Examples of Kernal control messages are LOADING, FOUND, and
PRESS PLAY ON TAPE. The MSGFLG control bits are: } I
MSGFLG bit 7 = 1 -» enable CONTROL messages
bit 6 = 1 -> enable ERROR messages
7. $FF93 SECND ;serial: send SA after LISTN
PREPARATION:
Registers:
Memory:
Flags:
Calls:
RESULTS:
Registers:
Memory:
Flags:
EXAMPLE:
LDA #8
JSR $FF81
LDA #15
JSR $FF93
.A = SA (secondary address)
system map
none
LISTN
.A used
STATUS ($90)
none
;LISTN device 8
;pass it SA #15
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