EPROM emulator for selectively simulating a variety of different

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365201, 3652381, 371 211, 364578, 3649338, 36492781, 36496576, 364965, G11C 700, G11C 2900

Patent

active

050035070

ABSTRACT:
An EPROM emulator makes use of a simple device with a housing connected to a eprom header which serves to connect the device to a circuit board in conjunction with a microprocessor emulator. Inside the housing are paging and data select circuits and a set of SRAM which are used in place of a traditional EPROM to hold the programming information. To program the device, the EPROM simulator is connected to the circuit board in place of an eprom. A switch on the housing is then turned to place the device in programming mode. The same switch also determines how the device is programmed by accessing the appropriate data lines for the number of pages of EPROM memory which are being emulated. After the switch is properly selected, the emulator is programmed by sending the data through the eprom socket on the circuit board via the microprocessor emulator. After the device is programmed, the switch on the housing is turned to place the device in read-only mode so that it can simulate an EPROM. In addition to the external switch, there are internal jumpers which are set to determine the type of EPROM which is to be emulated.

REFERENCES:
patent: 4319341 (1982-03-01), Fukushima
patent: 4363109 (1982-12-01), Gardner
patent: 4368515 (1983-01-01), Nielsen
patent: 4441167 (1984-04-01), Principi
patent: 4451903 (1984-05-01), Jordan
patent: 4485457 (1984-11-01), Balaska et al.
patent: 4578751 (1986-03-01), Ervin
patent: 4654829 (1987-03-01), Jiang et al.
patent: 4698790 (1987-10-01), Davis
patent: 4725983 (1988-02-01), Terada
Ball, Stuart R., "Build The Emulo-8", Byte, Apr. 1986, pp. 105-110.
Page Addressing Expands Addressable Memory in Up Systems, EDN, Apr. 30, 1987, pp. 189-197.

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