Flash EPROM programmer/emulator

The most comfortable as well as expensive way of developing microcontroller circuits is to emulate the relevant controller with the aid of an in-circuit emulator. Among the less costly options are a monitor program and an EPROM emulator. Unfortunately, a monitor program uses up some of the controller's resources. This serious disadvantage is avoided by using an EPROM emulator which behaves basically like a dual-ported RAM: one side has an interface like that of an EPROM, while the other provides the logic that pumps a datastream into the RAM.