Changes
PSG
,/* Noise Generator */
According to [https://github.com/mamedev/mame/blob/master/src/devices/sound/ay8910.h MAME]: The input to the shift register is bit0 XOR bit3. Bit0 is the output. This was verified on AY-3-8910 and YM2149 chips.
However, the algorithm is described in detail in the [[Media:Microchip ay8930.pdf|AY-8930 datasheet]]. And it disagrees with MAME, the input to the shift register is bit0 XOR bit2. And it seems bit1 is the output.
[[File:AY38910A noise block diagram.png]]
