begin implementing IEC serial protocol.

2019-05-01 21:40:32 +09:30
1 parent 27b33c2b26
commit 16dcfbe22b
@@ -0,0 +1,14 @@
+	;; 16 rasters = 16 x 63 cycles = ~1ms
+	;; (Probably 2 will be bad lines, so we will over-estimate the delay a bit)
+	
+wait1ms:
+	ldx #16
+	lda $d012
+*
+	cmp $d012
+	beq -
+	lda $d012
+	dex
+	bne -
+	rts
+