diff --git a/gameboy/makefile b/gameboy/makefile
index 18b19d3..7bf172a 100644
--- a/gameboy/makefile
+++ b/gameboy/makefile
@@ -114,7 +114,8 @@ objlisto := $(foreach o,$(objlist),obj/gb/$(o).o)
 
 $(title).gb: $(objlisto)
 	$(RGBLINK) -w -p 0xFF -m$(title).map -n$(title).sym -o$@ $^
-	$(RGBFIX) -p0 -v $@
+	cp $(title).gb $(title).beforefix
+	$(RGBFIX) -p 0xFF -m 'ROM' -vjcst '144P TEST' -kP8 -l0x33 $@
 
 #obj/gb/%.o: obj/gb/%-dedent.z80 src/gb.inc src/hardware.inc src/global.inc
 #	$(RGBASM) -o $@ $<
diff --git a/gameboy/src/header.z80 b/gameboy/src/header.z80
index 04bfaa9..02aa7f7 100644
--- a/gameboy/src/header.z80
+++ b/gameboy/src/header.z80
@@ -33,57 +33,11 @@ SECTION "rst00", ROM0[$0000]
 
 ; $18-$38 and $50-$60 not used and omitted to save space
 ; Caution: If you set a bit in IE, you MUST have a handler for that
-; interrupt.  VisualBoyAdvance is known to call interrupt handlers
-; on DI HALT.
+; interrupt.  VisualBoyAdvance calls interrupt handlers on DI HALT.
 
 SECTION "header", ROM0[$0100]
   ; All licensed games begin with NOP JP.  It may have had to do with
   ; the debugger used in the era.
   nop
   jp reset_handler
-
-  ; IPL uses this header to ensure D7-D0, A15, A5-A0, and /RD are
-  ; connected before calling something in the game that might
-  ; corrupt battery-backed save RAM.  The data inserted by RGBFIX
-  ; spells "Nintendo" when deinterleaved to tiles.
-  ds 48,$00
-
-  ; TODO: Figure out how much of this RGBFIX can fill in for me
-
-  ; 11-character title
-  DB "144P TEST"
-  DS 2,$00
-
-  ; Serial code (is ADME Doom or Animal Crossing?)
-  DS 4,$00
-
-  ; Execution mode (GBC runs in GBC mode if bit 7 is true)
-  DB CART_COMPATIBLE_DMG_GBC
-
-  ; $0144: Developer ID
-  DB "OK"
-
-  ; SGB mode
-  DB CART_INDICATOR_SGB
-
-  ; Mapper
-  DB CART_ROM
-
-  ; $0148: ceil(log2(ROM size / 32768))
-  DB $00
-  
-  ; log2(RAM size / 512)/2
-  DB $00
-
-  ; Region code
-  DB CART_DEST_NON_JAPANESE
-
-  ; Old hex developer ID: $33 means "see $0144"
-  ; Must be $33 for SGB support
-  DB $33
-  
-  ; ROM version number
-  DB $00
-
-  ; Leave space for header checksum to be filled in by rgbfix
-  DS 3
+  ds 76, $00