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The KC89C72 is frequently utilized in systems where it is paired with microcontrollers or processors to enhance overall system functionality. While it is sometimes listed as an "obsolete" or "hard-to-find" component, it is currently stocked by specialized distributors:
While exact pinouts vary by package type (commonly found in or QFP packages), the functional groups of the KC89C72 are standard for storage controllers. kc89c72 datasheet
On the KC89C72, pins 25 and 26 (/IOA, /IOB) are not functional as general-purpose I/O (unlike the AY-3-8910). Pull them to Vdd through 10k resistors. The KC89C72 is frequently utilized in systems where
Below is the standard pin configuration as described in the original manufacturer’s datasheet: pins 25 and 26 (/IOA