Standalone low-cost interface, controller and emulator for the apple II

Abstract An I/O Interface card for the Apple II microcomputer is described. The card provides a 6522 versatile interface adaptor and a 2716 EPROM. An onboard 6502 microprocessor and 1 k RAM enable the interface card to be used independently of the Apple II as a standalone microcomputer controller. The card thus serves as a simple incircuit emulator for itself when it is in the Apple II.