ref: a40ddc4668622c9068c3bf832e804ca7c9b6b4d7
parent: 10909e6b437f6c137c794337e94f32cdc7fe9eb4
author: Rangi <remy.oukaour+rangi42@gmail.com>
date: Mon Apr 6 09:35:38 EDT 2020
Ensure that the cartridge header is patched over all $00s, and comment on the entry point format
--- a/home/header.asm
+++ b/home/header.asm
@@ -56,14 +56,15 @@
jp Joypad
-; Game Boy cartridge header
-
SECTION "Header", ROM0[$0100]
Start::
+; Nintendo requires all Game Boy ROMs to begin with a nop ($00) and a jp ($C3)
+; to the starting address.
nop
jp _Start
-; The cartridge header data is filled in by rgbfix.
-; This makes sure it doesn't get used.
- ds $0150 - @
+; The Game Boy cartridge header data is patched over by rgbfix.
+; This makes sure it doesn't get used for anything else.
+
+ ds $0150 - @, $00