drhelius/Gearsystem

SG-1000 SN76489 PSG chip noise generation

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siriokds commented

Hi,
SMS (1 and 2), Genesis and Game Gear have and integrated PSG and, in the noise channel implementation, the tapped bits are bits 0 and 3 ($0009), fed back into bit 15.

For the SG-1000, Othello Multivision, SC-3000(H) and Colecovision, the tapped bits are bits 0 and 1 ($0003), fed back into bit 14.

drhelius commented

This is an easy fix.
Thanks for reporting!