https://gbdev.gg8.se/wiki/index.php?action=history&feed=atom&title=ASM_Init 2026-04-18T08:19:35Z Revision history for this page on the wiki MediaWiki 1.25.1 https://gbdev.gg8.se/wiki/index.php?title=ASM_Init&diff=519&oldid=prev 2012-12-08T16:06:08Z

<p>Created page with &#039;&lt;pre&gt; ; GB Initialization example ; RGBDS asm source ; David Pello 2012 INCLUDE &quot;gbhw.inc&quot; ; include GB hardware definitions ; vBlank interrupt SECTION &quot;Vblank&quot;,HOME[$…&#039;</p> <p><b>New page</b></p><div>&lt;pre&gt;<br /> <br /> ; GB Initialization example<br /> ; RGBDS asm source<br /> ; David Pello 2012<br /> <br /> <br /> INCLUDE &quot;gbhw.inc&quot; ; include GB hardware definitions<br /> <br /> ; vBlank interrupt<br /> SECTION &quot;Vblank&quot;,HOME[$0040]<br /> reti ; nothing, return<br /> <br /> ; Program starts here:<br /> SECTION &quot;start&quot;,HOME[$0100]<br /> nop<br /> jp start<br /> <br /> ; ROM Header (gbhw.inc macro)<br /> ; MBC1 mapper, 64K rom, 8K RAM<br /> ROM_HEADER ROM_MBC1_RAM_BAT, ROM_SIZE_64KBYTE, RAM_SIZE_8KBYTE<br /> <br /> ; program begins<br /> start:<br /> nop<br /> di ; disables interrupts<br /> ld sp, $fffe ; stack points to top of the high ram<br /> <br /> init:<br /> ; palletes<br /> ld a, %11100100 ; pallete colors from darker to<br /> ; lighter, 11 10 01 00<br /> ld [rBGP], a ; write this at the background pallete register<br /> ld [rOBP0], a ; and at the first sprites pallete<br /> <br /> ; scroll<br /> ld a, 0 ; write 0 to scroll registers X and Y<br /> ld [rSCX], a ; so visible screen is<br /> ld [rSCY], a ; at the top left of the background.<br /> <br /> ; now, you can turn off the LCD and load tiles, sprites, maps, etc<br /> <br /> <br /> <br /> <br /> &lt;/pre&gt;</div>

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