Kc89c72 Datasheet Fixed Link

The KC89C72 is a 40-pin DIP (Dual Inline Package) integrated circuit that functions as a . It is a clone of the original AY-3-8910 sound chip first designed by General Instrument in 1978, which was widely used in arcade games and personal computers like the ZX Spectrum and MSX.

The chip continuously produces analog sound based on these register values until changed. Application Areas

| /BC1 | /BDIR | Mode | Operation | | :--- | :--- | :--- | :--- | | 0 | 0 | Inactive | Data bus high impedance | | 0 | 1 | Write | Write data from DA0-7 to the selected register (address from A8) | | 1 | 0 | Read | Read value from selected register | | 1 | 1 | Address | Latch address from A8, prepare for read/write |

Controls the overall timing duration and shape characteristics (such as sustained, sawtooth, or triangle forms). kc89c72 datasheet

For those building hardware, these specifications are vital.

The is a highly versatile, 3-channel Programmable Sound Generator (PSG) integrated circuit designed by Korea Electronics Co. (KEC). It functions as a direct CMOS clone and exact software/hardware equivalent of the legendary General Instrument AY-3-8910 and Yamaha YM2149 sound chips. Highly favored in retro computing, arcade repair, and custom modern chiptune projects, the KC89C72 modernizes vintage 8-bit sound architecture using CMOS technology. This design delivers lower power consumption, increased chip stability, and superior compatibility with modern microcontrollers like the Arduino compared to original NMOS hardware. Technical Specifications Overview

Common integrated peripherals you’d expect in this class: The KC89C72 is a 40-pin DIP (Dual Inline

Note: Always verify that the datasheet you download is for the 28-pin DIP version. Some sellers mistakenly list the KC89C72 as a 40-pin device – that is an error.

// 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

Are you using this to (like an MSX, ZX Spectrum, or arcade cabinet)? Application Areas | /BC1 | /BDIR | Mode

The KC89C72 reads registers using three primary steering pins: , Bus Clock 2 (BC2) , and Bus Direction (BDIR) . Microcontrollers write to the sound generator by modulating these pins into three distinct phases: Latch Address (

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A digital mixer allows for the selective mixing of tone and noise on each of the three channels.

In a typical motherboard schematic, the KC89C72 sits between the ISA bus (or local bus) and the 34-pin floppy connector. It requires very few external supporting components—usually just a 24MHz crystal oscillator and a few decoupling capacitors. This high level of integration helped lower the Bill of Materials (BOM) cost for budget motherboard manufacturers.