A multi-functional control byte used to selectively enable/disable tone and noise components per channel.
+---\/---+ GND | 1 40| VCC (+5V) N.C. | 2 39| TEST 1 Analog Ch. B| 3 38| Analog Ch. A Analog Ch. C| 4 37| DA7 DA6 | 5 36| DA5 DA4 | 6 35| DA3 DA2 | 7 34| DA1 DA0 | 8 33| BC2 BC1 | 9 32| BDIR N.C. |10 31| /RESET CHIP |11 30| CLOCK IOA7|12 29| IOB7 IOA6|13 28| IOB6 IOA5|14 27| IOB5 IOA4|15 26| IOB4 IOA3|16 25| IOB3 IOA2|17 24| IOB2 IOA1|18 23| IOB1 IOA0|19 22| IOB0 TEST |20 21| N.C. +--------+ Bus Control Logic kc89c72 datasheet
When working directly with modern development architectures like Arduino or retro PCBs, adhering to the standard absolute ratings outlined below prevents component failure. Recommended Value / Range +5.0V DC ( ±plus or minus Standard TTL logic rail Input Clock Frequency 1.0 MHz to 2.0 MHz Typically driven at 1.77 MHz or 2.0 MHz Package Format DIP-40 (Dual In-line Package) Through-hole format Logic Thresholds TTL Compatible ≤is less than or equal to 0.8V, High: ≥is greater than or equal to Register Mapping & Sound Synthesis Control B| 3 38| Analog Ch
) to filter out digital switching noise from showing up in the analog audio channels. |10 31| /RESET CHIP |11 30| CLOCK IOA7|12
The that serves as a 100% software-compatible clone of the classic General Instrument AY-3-8910 . Originally manufactured by File Telecom (Taiwan) and frequently distributed through channels like UTSOURCE or Veswin , this integrated circuit (IC) is a staple in vintage computing preservation, arcade repair, and modern microelectronic hobby projects.