implement waitvsync for plus4/c16

2017-07-17 23:55:18 +02:00
parent 33791c6efd
commit fe850fece8
2 changed files with 13 additions and 1 deletions
--- a/libsrc/plus4/waitvsync.s
+++ b/libsrc/plus4/waitvsync.s
@@ -0,0 +1,12 @@
+
+        .export         _waitvsync
+
+        .include        "plus4.inc"
+
+_waitvsync:
+@l1:
+        lda     TED_VLINEHI
+        and     #$01
+        ora     TED_VLINELO
+        bne     @l1
+        rts