Hello GB

hello
General
Author	Damian Yerrick
Type	Demos
Version	0.03
License	zlib
System	CGB
Last Updated	2018/05/12
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This is a port of an NES sprite demo by Damian Yerrick to the Game Boy using RGBDS.

Screenshots

Compatibility

Tested by the author on mGBA 0.7-5026-1a6b47a2 and Game Boy Color with an EverDrive GB X5.

Changelog

v0.03 2018/05/12

• Switch to de facto standard hardware.inc (requested by gbdev Discord members).
• makefile: Use target name for rgbfix instead of hardcoding hello.gb.
• Hide BG and sprites before game loop to avoid sprite garbage (reported by nitro2k01).
• Use palette registers instead of LCDC to hide BG and sprites for GBC friendliness (requested by ISSOtm).
• Fade out Nintendo logo while detecting Super Game Boy on DMG.
• Add GBC palette approximating that used by nrom-template on NES.

v0.02 2018/03/27

• Split into separate files paralleling those of nrom-template.
• Use RLA SBC A sign extension idiom (suggested by ISSOtm).
• Remove unnecessary and broken OAM clearing.
• Add optional zealous memory clearing to satisfy BGB exceptions.
• Add doc comments to most subroutines.
• lcd_*: Don't push HL so much.
• Put global variables and the DMA routine's run address under SECTION control.
• Try RSSET/RB to allocate local variables, nearly but not fully eliminating EQU allocation.
• Display frame count and initial A, B contents at top.
• Change frame count in vblank IRQ, and HALT until it changes.
• Explicitly mark MMIO port and local variable accesses as LDH because RGBDS lacks a counterpart to ca65 .importzp. What is this, NESASM? Ref.
• Add indentation correction to the build process.
• Change padding value to $FF.
• makefile: Add BGB as secondary emulator for "make debug".

v0.01 2018/03/22

• Initial release.

External links

• NesDev forums - https://forums.nesdev.org/viewtopic.php?t=17174