From 178968cc2fc4c32fb918ebb4ccd24d78b64cd73f Mon Sep 17 00:00:00 2001
From: Javier Degirolmo
Date: Fri, 7 Oct 2011 12:17:54 -0300
Subject: Initial upload, Echo 0.8 UNSTABLE VERSION

---
 src-68k/video/vsync.68k | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 src-68k/video/vsync.68k

(limited to 'src-68k/video/vsync.68k')

diff --git a/src-68k/video/vsync.68k b/src-68k/video/vsync.68k
new file mode 100644
index 0000000..ed5ac17
--- /dev/null
+++ b/src-68k/video/vsync.68k
@@ -0,0 +1,19 @@
+;****************************************************************************
+; VSync
+; Waits until the next frame
+;****************************************************************************
+
+VSync:
+    lea     ($C00004), a6
+
+@Loop1:                             ; Wait until current VBlank is over
+    move.w  (a6), d7
+    btst.l  #3, d7
+    bne.s   @Loop1
+
+@Loop2:                             ; Wait until next VBlank starts
+    move.w  (a6), d7
+    btst.l  #3, d7
+    beq.s   @Loop2
+
+    rts                             ; End of subroutine
-- 
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