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AY-3-8912 Programmable Sound Generator

All Oric models make use of a General Instruments AY-3-8910 programmable sound generator (PSG) for audio output.

The chip provides audio output to the internal speaker and also exposes audio signals on two pins of the Cassette DIN port.


  • The PSG is also used to manage keyboard input.
  • It uses a clock derived from that of the 6502 CPU which is slightly delayed compared to the CPU phi2 clock.

Many people opt to disconnect the internal speaker, preferring instead to connect the Oric to an external amplifier in order to obtain much improved audio quality.

Technical Guide

Detailed information about the PSG operation and programming is available in the AY-3-8912 Technical Guide.

oric/hardware/ay-3-8912.txt · Last modified: 2019/03/31 01:32 by nekoniaow