some more simple fixes, make targettest(s) work

2025-06-25 02:38:40 +02:00
parent 79b2d25840
commit db49432561
19 changed files with 930 additions and 2 deletions
--- a/libsrc/mega65/revers.s
+++ b/libsrc/mega65/revers.s
@@ -0,0 +1,27 @@
+;
+; Ullrich von Bassewitz, 07.08.1998
+;
+; unsigned char revers (unsigned char onoff);
+;
+
+        .export         _revers
+
+        .include        "mega65.inc"
+
+.proc   _revers
+
+        ldx     #$00            ; Assume revers off
+        tay                     ; Test onoff
+        beq     L1              ; Jump if off
+        ldx     #$80            ; 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
+