Data processing system integrated circuit having modular memory add-on capacity
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United States of America Patent
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May 8, 1984
Grant Date -
N/A
app pub date -
May 29, 1980
filing date -
May 29, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of designing and manufacturing a modular integrated circuit for a 4 bit microcomputer family utilizing a modular concept which is adaptable for a variety of applications and specific circuit desgins. The modular circuit is designed as a large block of cells which contains an ALU, instruction decoder, bus structure and a small amount of RAM and ROM as well as ROM control logic. In addition, the block contains attachment points for additional ROM and RAM and for special input/output devices such as I/O bus, timekeeping, A-D, D-A, display drive, communication ports and general purpose control lines.
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