Datasheet for Intel 82077AA single‑chip floppy disk controller with specifications, pinout, registers and programming guidelines.
The Intel 82077AA is a single‑chip floppy disk and tape drive controller designed for PC‑AT, PS/2 and Model 30 systems. It integrates drive and data‑bus buffers, a high‑speed processor interface, and supports both standard and perpendicular recording modes.
Key features include a 24 MHz crystal oscillator, 16‑byte FIFO, 40 mA drive buffers, and selectable data rates from 250 Kbps up to 1 Mbps. The device is offered in a 68‑lead PLCC plastic package and provides a comprehensive register set for microprocessor interfacing and command control.
| Crystal Frequency | 24 MHz |
|---|---|
| Package Type | 68‑lead PLCC (plastic) |
| FIFO Size | 16 bytes |
| Drive Buffer Current | 40 mA |
The controller is offered in a 68‑lead PLCC plastic package.
The device includes a 16‑byte FIFO.
A 24 MHz crystal is used for the controller.