Kc89c72 Datasheet [repack] Jun 2026

LD A, 0x08 ; Select R8 (Amplitude A) OUT (0x80), A LD A, 0x0F ; Max volume (16-level) OUT (0x81), A

The is a 40-pin DIP (Dual In-line Package) integrated circuit that functions as a Programmable Sound Generator (PSG) . It is widely recognized as a clone of the classic General Instrument AY-3-8910 and is commonly found in retrocomputing systems like the MSX, ZX Spectrum, and various arcade machines. Core Technical Specifications kc89c72 datasheet

A hardware envelope generator that provides automated amplitude (volume) control, allowing sounds to fade in or out without constant CPU intervention. I/O Ports: LD A, 0x08 ; Select R8 (Amplitude A)

The is primarily known for being a 100% software-compatible clone of the legendary General Instrument AY-3-8910 Programmable Sound Generator (PSG). This means it can be used as a direct "drop-in" replacement in vintage hardware, such as MSX computers or arcade machines, without requiring any software modifications. Key Features and Specifications I/O Ports: The is primarily known for being

: It features three independently programmable sound channels, a noise generator, and an envelope generator.

What makes the KC89C72 datasheet truly interesting, however, is what it omits. It does not tell you that this chip, when overclocked, produces a gritty, aliased distortion that modern musicians covet. It does not mention that the envelope generator has a quirk—a hold time that is slightly shorter than the Western original, giving Soviet-made music a unique rhythmic lilt. It provides no history of the factory workers who assembled these chips with outdated lithography machines, breathing microscopic dust that would later be diagnosed as a rare lung disease.

: The chip uses a bus-based protocol (BDIR and BC1 pins) to receive data, which can be managed via shift registers (like the 74HC595) to save Arduino pins.