The HY29F800A can be programmed and erased in-system with a single 5-volt VCC supply. Internally generated and regulated voltages are provided for program and erase operations, so that the device does not require a high voltage power supply to perform those functions. The device can also be programmed in standard EPROM programmers. Access times as fast as 55 ns over the full operating voltage range of 5.0 volts 10% are offered for timing compatibility with the zero wait state requirements of high speed microprocessors. A 50 ns Preliminary