add waitvsync() for atari and atari5200

2020-10-27 22:25:58 +01:00
parent 79cf1e13a7
commit 3537210674
6 changed files with 36 additions and 1 deletions
--- a/libsrc/atari/waitvsync.s
+++ b/libsrc/atari/waitvsync.s
@@ -0,0 +1,15 @@
+;
+; Written by Christian Groessler <chris@groessler.org>
+;
+; void waitvsync (void);
+;
+
+        .include        "atari.inc"
+        .export         _waitvsync
+
+.proc   _waitvsync
+        lda     RTCLOK+2
+@lp:    cmp     RTCLOK+2
+        beq     @lp
+        rts
+.endproc