Sets fixed volumes or enables dynamic envelope modulation for Channels A, B, and C.
Are you using this to (like an MSX, ZX Spectrum, or arcade cabinet)?
The KC89C72 matches the exact footprint of the General Instrument AY-3-8910 . The pin distribution allows for straightforward Drop-In replacement on legacy circuit boards: kc89c72 datasheet
Determines the frequency period for the noise channel.
Compatible with standard 8-bit CPUs via a simple bus interface. Cross-Reference and Equivalents Sets fixed volumes or enables dynamic envelope modulation
: Set both BC1 = 0 and BDIR = 0 to release the shared bidirectional data lines.
f=Fclock16×Register Valuef equals the fraction with numerator cap F sub c l o c k end-sub and denominator 16 cross Register Value end-fraction kc89c72 datasheet
is frequently utilised in sectors requiring consistent, low-power control logic: Dashboard controllers and engine sensors.
(Channel A Tone Period) : 12-bit value split across two registers to control Channel A's pitch.
(Stressing beyond these may destroy the chip):
The KC89C72 was widely used in during the 1990s. It acted as a cost-effective alternative to controllers from larger manufacturers like Intel, National Semiconductor, or NEC.