Talk:CPU pinout

Pin 30

The signal from pin 30 goes through the exact same "processing" as the chip's /RESET signal, at which point it goes to the output logic for the M2 pin (don't know exactly what it does) and then through an inverter which goes to the enables for $4018-$401A and to some other spots (seemingly related to the data buffer used for Sprite DMA). Bit 7 of the writable register at $401A seems to propagate to numerous locations within the sound channels and thus might be responsible for the observation of all writable registers disappearing. --Quietust 16:49, 29 April 2011 (UTC)