# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1547095093 -7200
# Node ID 216bdbc75cf489560706ee34c34fd610e510f39e
# Parent  d7c6e1165028bf64afb2a0e4c3e4aeca99194496
optionally use the generated chessboard instead of the logo to fit in my 2k
test ROM

diff -r d7c6e1165028 -r 216bdbc75cf4 Makefile
--- a/Makefile	Thu Jan 10 06:05:21 2019 +0200
+++ b/Makefile	Thu Jan 10 06:38:13 2019 +0200
@@ -28,3 +28,10 @@
 
 sin.inc: gensine
 	./gensine >$@
+
+test2k.rom: $(img)
+	dd if=$< of=$@ bs=1 count=2048
+
+.PHONY: program
+program: test2k.rom
+	minipro -p 'AT28C16E @DIP24' -w $<
diff -r d7c6e1165028 -r 216bdbc75cf4 test.asm
--- a/test.asm	Thu Jan 10 06:05:21 2019 +0200
+++ b/test.asm	Thu Jan 10 06:38:13 2019 +0200
@@ -1,4 +1,11 @@
 ; vi:ft=rgbasm:
+; -------- build options ----------
+BUILD_CHESS equ 1
+BUILD_LOGO equ 2
+
+BUILD = BUILD_LOGO
+; ---------------------------------
+
 include "hw.inc"
 
 xoffs_center equ 4
@@ -177,7 +184,8 @@
 	or c
 	jp nz, .copytiles
 
-	; copy tilemap
+IF BUILD == BUILD_LOGO
+	; copy logo tilemap
 	ld hl, $9800
 	ld de, tilemap
 	ld b, 21
@@ -197,6 +205,24 @@
 
 	dec b
 	jr nz, .copymap
+ELSE
+	; generate chessboard tilemap
+	ld hl, $9800
+	ld b, 32
+.fillscr:
+	ld c, 32
+.fillrow:
+	ld a, b
+	add a, c
+	and a, 1
+
+	ld [hl+], a
+	dec c
+	jr nz, .fillrow
+
+	dec b
+	jr nz, .fillscr
+ENDC
 
 	; center viewport
 	ld a, yoffs_center
@@ -253,9 +279,33 @@
 sintab:
 include "sin.inc"
 
+IF BUILD == BUILD_LOGO
 tiles:
 incbin "logo.tiles"
 tiles_end:
 tilemap:
 incbin "logo.tilemap"
 tilemap_end:
+
+ELSE
+; chessboard tiles
+tiles:
+	db $55,$00
+	db $aa,$00
+	db $55,$00
+	db $aa,$00
+	db $55,$00
+	db $aa,$00
+	db $55,$00
+	db $aa,$00
+
+	db $ff,$aa
+	db $ff,$55
+	db $ff,$aa
+	db $ff,$55
+	db $ff,$aa
+	db $ff,$55
+	db $ff,$aa
+	db $ff,$55
+tiles_end:
+ENDC