File: revers.s

package info (click to toggle)
cc65 2.19-2
  • links: PTS
  • area: main
  • in suites: forky, sid, trixie
  • size: 20,268 kB
  • sloc: ansic: 117,151; asm: 66,339; pascal: 4,248; makefile: 1,009; perl: 607
file content (28 lines) | stat: -rw-r--r-- 900 bytes parent folder | download | duplicates (3) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
 

        .include        "gamate.inc"
        .include        "extzp.inc"

        .export _revers

.proc   _revers

        ldx     #$00            ; Assume revers off
        tay                     ; Test onoff
        beq     L1              ; Jump if off
        ldx     #$ff            ; Load on value
        ldy     #$00            ; Assume old value is zero
L1:     lda     RVS             ; Load old value
        stx     RVS             ; Set new value
        beq     L2              ; Jump if old value zero
        iny                     ; Make old value = 1
L2:     ldx     #$00            ; Load high byte of result
        tya                     ; Load low byte, set CC
        rts

.endproc

;-------------------------------------------------------------------------------
; force the init constructor to be imported

        .import         initconio
conio_init      = initconio