Zachary Wassall runer112

Senior software engineer at Globus Medical. Master of CS from Northeastern University. Hobbyist low-level programmer of TI graphing calculators.

runer112 / roundf.src

Last active March 26, 2022 04:22

EZ80 implementation of roundf

	assume adl=1

	section .text
	public _roundf
	_roundf:
	; exponent_biased >= 0 && exponent_biased < 256
	; && exponent_biased = exponent + 127
	; = exponent + 127 >= 0 && exponent + 127 < 256
	; = exponent >= -127 && exponent < 129

runer112 / gist:aa317e6b8325e9292e9d9ed6f0e8a0f4

Last active November 8, 2020 09:01

*Really* fast GB sample playback through $FF1C writes

	; Response to https://gist.github.com/nitro2k01/e45e47f8469009b8a43ad5e48d951442,
	; which is nitro2k01's response to RGME about Pokemon Yellow sample playback.
	; For this to make any sense, you'll definitely want to watch the video and
	; then read nitro2k01's response.

	; With the restriction that the sound data must end at the end of a page (which
	; seems fine, you're probably not fitting multiple of these onto a page), 24
	; cycles per sample is achievable:

	; hl = data

runer112 / memset_fast.asm

Last active September 2, 2016 16:02

Optimized memset_fast to 25 bytes

	; (c) Copyright 2016 Matt Waltz
	;-------------------------------------------------------------------------
	; Faster memset variation
	; Reasons faster:
	; 1) uses ldir to memset
	; 2) executes in RAM to avoid flash wait states
	;-------------------------------------------------------------------------
	.def _memset_fast
	.assume adl=1