SN76489 TestRom - Homebrew

Tool for Game Gear

Version	Date	By	Download
1.00	27 Mar 2024	JoppyFurr	SN76489TestRom-GG-1.00.zip (113KB) (includes source)

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Competition Entry

This was a competition entry in 2024

Seeing as my first entry is for testing a somewhat uncommon piece of hardware, I figured I'd make a second entry, for the SN76489/compatible sound chip available in all Master Systems.

This tool is intended to help testing real hardware against emulators to help spot differences in behaviour.

Seeing as the SN76489 doesn't have a key-on register, the volume of each channel is held at 15 (silent) until a button/key is pressed. The 'const' mode allows the volume to be passed to the chip without a key/button being pressed.

A Game Gear version is also included which adds toggles for the stereo bits.