qdosmsq:traps:trap_3:sula [QDOS Internals]

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====== SD_SETFL/IOW_SFLA & SD_SETUL/IOW_SULA ======


These traps set on or off flashing and underlining.
^Trap^Value in D0.B^Action^
|SD_SETFL/IOW_SFLA|$2A|Set flash mode|
|SD_SETUL/IOW_SULA|$2B|Set underline mode|

^Call Parameters^^Return Parameters^^
|D0.B|See above|D0.L|Error return.|
|D1.B|Set mode |D1.L|Corrupted.|
|D3.W|Timeout |D3.L|Preserved.|
|A0.L|Channel ID |A0.L|Preserved.|
|A1.L| |A1.L|Corrupted.|

===== Errors =====


|ERR_NC|Not complete.|
|ERR_NO|Channel not open.|


===== Notes =====
  * All registers not shown above are not used on entry and are preserved on exit.
  * The value in D1.B determines whether the mode is to be on or off. A value of 0 sets it off. Other values set it on.

===== Example =====
The example below shows the use of this trap call to print As with the A underlined. It is assumed that A0 contains the window's ID.

<code>
udline  moveq   #-1,d3          ; Timeout
        moveq   #1,d1           ; To set underlining on
        bsr     ul              ; Call sd_setul
        moveq   #"A",d1         ; To print A
        bsr     prt             ; Call io_sbyte
        moveq   #0,d1           ; To set underlining off
        bsr     ul
        moveq   #"s",d1         ; To print s
        bsr     prt


ul      moveq   #sd_setul,d0
ul_1    trap    #3
        tst.l   d0              ; OK? . .
        bne     error           ; . . no!
        rts

prt     moveq   #io_sbyte,d0
        bra     ul_1
       
</code>