changed CPU speed handling for MEGA65

2020-10-11 20:56:30 +02:00
1 parent 121f49b763
commit 47b9676ca9
@@ -0,0 +1,18 @@
+;; #LAYOUT# M65 KERNAL_0 #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+;
+; Helper routine for setting VIC-IV control registers A and C
+;
+
+
+mega65_viciv_setctrl_AC:
+
+	sta VIC_CTRLA
+
+	lda VIC_CTRLC
+	and #%01101000
+	ora #%01000000  ; make C65/C128 fast modes switch to max MEGA65 CPU speed
+	sta VIC_CTRLC
+
+	rts