megademo: start arranging the files

megademo/c64_opener.s

@@ -2,12 +2,15 @@
 ; all good demos start with the C64 boot screen, right?
 
 ; Apple II has a lot of trouble making clear text with bluish background
-; would be a lot clearer if I used black and white
+; it looks a lot cleaner in black+white
 
-TOP = $F0
-BOTTOM = $F1
+; Zero page addresses
+
+TOP	= $F0
+BOTTOM	= $F1
 
 c64_opener:
+
 	;===================
 	; init vars
 	;===================
@@ -16,34 +19,16 @@ c64_opener:
 	sta	BOTTOM
 
 	;===================
-	; set graphics mode
+	; setup graphics
 	;===================
 
+	; We assume that the c64 image was put in $2000 by the loader
+
 	bit	PAGE0                   ; first graphics page
 	bit	FULLGR			; full screen graphics
 	bit	HIRES			; hires mode !!!
 	bit	SET_GR			; graphics mode
 
-;	lda	#<c64
-;	sta	LZ4_SRC
-;	lda	#>c64
-;	sta	LZ4_SRC+1
-
-;	lda	#<(c64_end-8)		; skip checksum at end
-;	sta	LZ4_END
-;	lda	#>(c64_end-8)		; skip checksum at end
-;	sta	LZ4_END+1
-
-
-
-;	lda	#<$2000
-;	sta	LZ4_DST
-;	lda	#>$2000
-;	sta	LZ4_DST+1
-
-;	jsr	lz4_decode
-
-
 	jsr	wait_until_keypress
 
 	;==============================

megademo/megademo.s

@@ -6,15 +6,7 @@
 .include "hardware.inc"
 
 
-        ;===================
-        ; graphics
-        ;===================
-;c64:					; this should end up at $2000-$4000
-;.incbin "c64.img"
-;c64_end:
-
-
-real_start:				; this should end up at $4000
+megademo_start:				; this should end up at $4000
 
 	;===================
 	; Check for Apple II and patch