Datasheet !!better!! — Kc89c72
: Programmable envelope generator with various shapes (sawtooth, triangle, etc.).
: Parts should be kept in dry storage cabinets with humidity protection to maintain lead integrity.
The KC89C72 uses three control pins – – to select read/write operations and address/data latches. kc89c72 datasheet
The is a CMOS Programmable Sound Generator (PSG) designed as a direct, 100% software-compatible clone of the classic General Instrument AY-3-8910 . Primarily used in vintage arcade machines, slot machines, and home computers, it remains in production today as a reliable alternative for repairs and retro-hardware development. Core Specifications & Features
Due to its exact pinout and software compatibility with the AY-3-8910, the KC89C72 has been used in a variety of legacy systems and specialized hardware: The is a CMOS Programmable Sound Generator (PSG)
| Register (A8 = 0-15) | Name | Function | | :--- | :--- | :--- | | 0 | Channel A Fine Tune | Lower 8 bits of tone period | | 1 | Channel A Coarse Tune | Upper 4 bits of tone period | | 2 | Channel B Fine Tune | Lower 8 bits | | 3 | Channel B Coarse Tune | Upper 4 bits | | 4 | Channel C Fine Tune | Lower 8 bits | | 5 | Channel C Coarse Tune | Upper 4 bits | | 6 | Noise Period | 5-bit noise frequency control | | 7 | Mixer / I/O Enable | Enable/disable tone/noise per channel, I/O control | | 8 | Channel A Volume | 4-bit volume (or envelope enable) | | 9 | Channel B Volume | Same as above | | 10 | Channel C Volume | Same as above | | 11 | Envelope Fine | Lower 8 bits of envelope period | | 12 | Envelope Coarse | Upper 8 bits (total 16-bit envelope period) | | 13 | Envelope Shape | Cycle, hold, alternate, attack patterns | | 14 | I/O Port A | Not used on KC89C72 (read returns 0xFF) | | 15 | I/O Port B | Not used |
The datasheet reveals a 40-pin DIP (Dual In-line Package) chip designed as a . It is 100% software-compatible with its ancestors, meaning code written for a 1983 arcade machine will run identically on this modern silicon. It is 100% software-compatible with its ancestors, meaning
The is a highly integrated programmable sound generator (PSG), most famously known as a cross-reference or clone of the legendary General Instrument AY-3-8910 . It is a staple in vintage arcade hardware, such as Nintendo's Popeye and Sky Skipper , as well as 8-bit home computers.
