; Assume KC89C72 base address = 0x80 ; Write to address register LD A, 0x00 ; Select R0 (Tone A low byte) OUT (0x80), A ; Write data to selected register LD A, 0x7E ; Low byte value for 440Hz at 1MHz OUT (0x81), A LD A, 0x01 ; Select R1 (Tone A high byte) OUT (0x80), A LD A, 0x02 ; High byte value OUT (0x81), A
A: Tie both directly to GND for normal operation. Leaving them floating may cause erratic behavior.
| Feature | AY-3-8910 (NMOS) | KC89C72 (CMOS) | YM2149 (Yamaha) | |-------------------------|------------------|------------------|----------------------| | Technology | NMOS | CMOS | NMOS | | Power consumption | ~100 mA | ~15 mA | ~50 mA | | Output type | Open-drain | Push-pull | Push-pull (different voltage swing) | | Pinout | 40-pin DIP | 40-pin DIP | 40-pin DIP, pin-compatible | | Noise generator | Yes | Yes | Yes (different PRNG) | | Envelope shapes | 16 | 16 | 16 | | I/O ports | 8+8 bits | 8+8 bits | 8+8 bits |
A: Start with a Google search for “kc89c72 datasheet PDF”. The top results often include Alldatasheet and Datasheet4U. Be careful of subscription walls — many sites offer free previews. Conclusion The kc89c72 datasheet is more than just a pinout diagram — it is the key to unlocking the capabilities of a classic sound chip that defined an era of computing and gaming. Whether you are repairing a vintage arcade board, building a chiptune synthesizer, or learning about retro hardware programming, the KC89C72 remains a relevant and rewarding component.
LD A, 0x08 ; Select R8 (Amplitude A) OUT (0x80), A LD A, 0x0F ; Max volume (16-level) OUT (0x81), A
This article serves as an — combining available public data, pinout diagrams, electrical characteristics, and application notes — for anyone who needs the critical information typically found in a KC89C72 datasheet. Part 1: What is the KC89C72? The KC89C72 is a 3-voice programmable sound generator (PSG) IC. It was manufactured by Microchip Technology (after acquiring GI’s semiconductor division) and also under license by other vendors like GoldStar (now LG) and UMC .
A: No. The analog outputs (ANOD, BNOD, CNOD) are current outputs that directly drive a speaker or amplifier through a simple resistor and capacitor.
The datasheet provides frequency calculation formulas: [ \textTone Period = \frac\textClock Frequency16 \times \textDesired Frequency - 1 ] Q: Is the KC89C72 still in production? A: No. It has been obsolete since the late 1990s. Only NOS (new old stock) or used pulls are available on eBay or surplus electronics sites.
Kc89c72 Datasheet May 2026
; Assume KC89C72 base address = 0x80 ; Write to address register LD A, 0x00 ; Select R0 (Tone A low byte) OUT (0x80), A ; Write data to selected register LD A, 0x7E ; Low byte value for 440Hz at 1MHz OUT (0x81), A LD A, 0x01 ; Select R1 (Tone A high byte) OUT (0x80), A LD A, 0x02 ; High byte value OUT (0x81), A
A: Tie both directly to GND for normal operation. Leaving them floating may cause erratic behavior.
| Feature | AY-3-8910 (NMOS) | KC89C72 (CMOS) | YM2149 (Yamaha) | |-------------------------|------------------|------------------|----------------------| | Technology | NMOS | CMOS | NMOS | | Power consumption | ~100 mA | ~15 mA | ~50 mA | | Output type | Open-drain | Push-pull | Push-pull (different voltage swing) | | Pinout | 40-pin DIP | 40-pin DIP | 40-pin DIP, pin-compatible | | Noise generator | Yes | Yes | Yes (different PRNG) | | Envelope shapes | 16 | 16 | 16 | | I/O ports | 8+8 bits | 8+8 bits | 8+8 bits | kc89c72 datasheet
A: Start with a Google search for “kc89c72 datasheet PDF”. The top results often include Alldatasheet and Datasheet4U. Be careful of subscription walls — many sites offer free previews. Conclusion The kc89c72 datasheet is more than just a pinout diagram — it is the key to unlocking the capabilities of a classic sound chip that defined an era of computing and gaming. Whether you are repairing a vintage arcade board, building a chiptune synthesizer, or learning about retro hardware programming, the KC89C72 remains a relevant and rewarding component.
LD A, 0x08 ; Select R8 (Amplitude A) OUT (0x80), A LD A, 0x0F ; Max volume (16-level) OUT (0x81), A ; Assume KC89C72 base address = 0x80 ;
This article serves as an — combining available public data, pinout diagrams, electrical characteristics, and application notes — for anyone who needs the critical information typically found in a KC89C72 datasheet. Part 1: What is the KC89C72? The KC89C72 is a 3-voice programmable sound generator (PSG) IC. It was manufactured by Microchip Technology (after acquiring GI’s semiconductor division) and also under license by other vendors like GoldStar (now LG) and UMC .
A: No. The analog outputs (ANOD, BNOD, CNOD) are current outputs that directly drive a speaker or amplifier through a simple resistor and capacitor. The top results often include Alldatasheet and Datasheet4U
The datasheet provides frequency calculation formulas: [ \textTone Period = \frac\textClock Frequency16 \times \textDesired Frequency - 1 ] Q: Is the KC89C72 still in production? A: No. It has been obsolete since the late 1990s. Only NOS (new old stock) or used pulls are available on eBay or surplus electronics sites.