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SETMSG

     Purpose:  Control system message output
Call address:  $FF90 (hex)  65424 (decimal)
Communication registers:  A
Preparatory routines:  None
Error returns:  None
Stack requirements:  2
Registers affected:  A

Description:

This routine controls the printing of error and control messages by the KERNAL. Either print error messages or print control messages can be selected by setting the accumulator when the routine is called. FILE NOT FOUND is an example of an error message. PRESS PLAY ON CASSETTE is an example of a control message.

Bits 6 and 7 of this value determine where the message will come from. If bit 7 is 1, one of the error messages from the KERNAL is printed. If bit 6 is set, control messages are printed.

How to Use:

  1. Set accumulator to desired value.
  2. Call this routine.

EXAMPLE:

     LDA #$40
     JSR SETMSG    ;TURN ON CONTROL MESSAGES
     LDA #$80
     JSR SETMSG    ;TURN ON ERROR MESSAGES
     LDA #0
     JSR SETMSG    ;TURN OFF ALL KERNAL MESSAGES
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