Switched to using tmp1 instead of self-mod to store the jiffies value

2024-12-23 04:30:10 +00:00 · 2022-08-08 15:17:28 -05:00 · 2022-08-08 15:17:28 -05:00 · 9b3b652fa5
commit 9b3b652fa5
parent 78870219a4
1 changed files with 3 additions and 3 deletions
--- a/libsrc/cx16/waitvsync.s
+++ b/libsrc/cx16/waitvsync.s
@ -10,15 +10,15 @@
 ;

        .export         _waitvsync
+        .importzp       tmp1

 .proc _waitvsync: near
      RDTIM = $FFDE  ; Kernal API for reading the jiffy timer
      jsr RDTIM
-      sta lastjiffy
+      sta tmp1
 keep_waiting:
      jsr RDTIM
-      cmp #$FF       ; self-mod the value returned by RDTIM to save memory
-      lastjiffy=(*-1)
+      cmp tmp1
      beq keep_waiting
      rts
 .endproc