Before revision: High-pass filter Keyboard scan (up to 64 keys) + 2 modifier bits (Shift, Control) + Break Potentiometer ports (8 independent ports, each with 8-bit resolution) High Resolution Timers (audio channels 1, 2, and 4 can be configured to cause timer interrupts when they cross zero) Random number generator (8 bits of a 17-bit polynomial counter can be read) Serial I/O port Eight IRQ interrupts Versions By part number: C012294 — Used in all Atari 8-bit family computers, including the Atari XEGS, as well as the Atari 5200 console.
After revision: High-pass filter Keyboard scan (up to 64 keys) + 2 modifier bits (Shift, Control) + Break Potentiometer ports (8 independent ports, each with 8-bit resolution) High Resolution Timers (audio channels 1, 2, and 4 can be configured to cause timer interrupts when they cross zero) Random number generator (8 bits of a 17-bit polynomial counter can be read) Serial I/O port Eight IRQ interrupts Versions By part number: C012294 — Used in all Atari 8-bit family computers, including the Atari XEGS, and the Atari 5200 console.