From ea7f1d5948a86e94180d399d88b2d7eac0047799 Mon Sep 17 00:00:00 2001
From: Vince Weaver <vince@deater.net>
Date: Fri, 8 Nov 2024 01:27:53 -0500
Subject: [PATCH] driven: work on horiz scroll

---
 demos/driven/part05_atrus/big_horiz_scroll.s      | 15 +++++++++++++++
 .../{old => other}/big_horiz_scroll.s             |  0
 2 files changed, 15 insertions(+)
 rename demos/driven/part05_atrus/{old => other}/big_horiz_scroll.s (100%)

diff --git a/demos/driven/part05_atrus/big_horiz_scroll.s b/demos/driven/part05_atrus/big_horiz_scroll.s
index 03c8d520..b95f6260 100644
--- a/demos/driven/part05_atrus/big_horiz_scroll.s
+++ b/demos/driven/part05_atrus/big_horiz_scroll.s
@@ -7,6 +7,21 @@
 	; even frames, like normal
 	; odd frames, start with odd
 
+	; X6543210 XDCBA987
+
+	; 0123456 789ABCD	X		Y	Z
+	; 	lda X, sta Y  lda X+1, sta Y+1
+	; 2345678 9ABCDef	X<<2 | Y<<2
+	;	lda X, sta Y  lda X+1 and #$fc lda Y+1, and #$3 ora, sta Y+1
+	; 456789A BCDefgh	X<<4 | Y<<4
+	;	lda X, sta Y  lda X+1 and #$fc lda Y+1, and #$3 ora, sta Y+1
+	; 6789ABC Defghij	X<<6 | Y<<6
+	; 89ABCDe fghijkl	Y<<1 | Z<<1
+	; ABCDefg hijklmn	Y<<3 | Z<<3
+	; CDefghi jklmnop	Y<<5 | Z<<6
+	; efghijk lmnopqr	Z
+
+
 
 do_scroll:
 	lda	#0
diff --git a/demos/driven/part05_atrus/old/big_horiz_scroll.s b/demos/driven/part05_atrus/other/big_horiz_scroll.s
similarity index 100%
rename from demos/driven/part05_atrus/old/big_horiz_scroll.s
rename to demos/driven/part05_atrus/other/big_horiz_scroll.s