Kc89c72 Datasheet Verified Online

(Mixer / I/O Enable) : Multi-functional register. Enables or disables tones and noise for all three channels. It also sets the direction of I/O Ports A and B.

The reveals a classic, elegant PSG that defined the sound of countless arcade machines (like Pac-Man and Galaxian ), home computers (MSX, Sinclair ZX Spectrum 128), and synthesizers. Its CMOS construction offers low power consumption, and its 28-pin form factor makes it relatively breadboard-friendly.

If a KC89C72 is unavailable, several other chips offer the same functionality and pin-for-pin compatibility, including the Yamaha YM2149 , the Winbond WF19054 , and the original GI AY-3-8910. For purchase, they are often available through specialized electronics retailers like UTSource or eBay . Go to product viewer dialog for this item. Googlehttps://www.google.com KC89C72 in-line DIP-40 89C72 #96-9

Since the original is missing, use these resources: kc89c72 datasheet

: Three independent internal generators divide the main system clock down to produce crisp square-wave frequencies.

// Write register function void writeReg(uint8_t reg, uint8_t value) digitalWrite(A8_PIN, reg & 0x01); // Only A8 matters for 2-register mode // Address mode: digitalWrite(BC1_PIN, HIGH); digitalWrite(BDIR_PIN, HIGH); delayMicroseconds(1); digitalWrite(BC1_PIN, LOW); // Write mode: PORTC = value; // Data out digitalWrite(BDIR_PIN, HIGH); delayMicroseconds(1); digitalWrite(BDIR_PIN, LOW);

Since it is a direct replacement for the AY-3-8910, it shares the following technical characteristics: : 3 independent sound channels (A, B, and C). Package : 40-pin DIP (Dual In-line Package). Operating Voltage : Standard +5V DC. Clock Frequency : Typically runs between 1 MHz and 2 MHz. (Mixer / I/O Enable) : Multi-functional register

Each channel has a dedicated 4-bit amplitude control, allowing for 16 different volume levels. The volume can be set directly or controlled via the envelope generator. 4. Envelope Generator

// Silence all channels and disable noise (Reg 7 = 0b00111111) writeReg(7, 0x3F); // Set Channel A volume max (Reg 8 = 0b1111) writeReg(8, 0x0F); // Set Channel A tone period (440 Hz) – calculate accordingly writeReg(0, 0xAF); // Fine writeReg(1, 0x06); // Coarse

: Bus Control and Bus Direction signals used to manage data flow from a host CPU. DA0-DA7 : The 8-bit bidirectional data bus. The reveals a classic, elegant PSG that defined

Place a 100 nF ceramic capacitor close to pins 40 (VCC) and 21 (GND) to minimize noise.

These original chips are no longer in production, making the KC89C72 a valuable component for the restoration and repair of classic hardware, and for use in new retro-inspired projects. In the retro community, it's well-known that the for the AY-3-8910, and is also interchangeable with Yamaha's related SSG (Software-controlled Sound Generator) chip, the YM2149.

Despite the age of this component, several sources still host scanned PDFs of the original datasheet: