Memory access control apparatus

Details Memory access control apparatus Memory access control apparatus

1982-07-07

1986-11-11

Shaw, Gareth D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

G06F 900

Patent

active

046225471

ABSTRACT:
In a microcomputer system with an asynchronous working central processing unit (CPU) and a cathode ray tube (CRT) display, a memory access control apparatus includes a memory, particularly a video RAM, a CRT controller connected to the CRT for accessing the memory, a system clock for generating system clock pulses which are supplied to the CPU, a multiplexing clock for generating multiplexing clock signals based on the system clock and having a frequency which is one-half the frequency of the system clock pulses, and a multiplexer connected to the CPU and the CRT controller through which the CPU and the CRT controller selectively access the memory in a time sharing manner according to the multiplexing clock signals.

REFERENCES:
patent: 4117469 (1978-09-01), Levine
patent: 4121283 (1978-10-01), Walker
patent: 4482979 (1984-11-01), May
patent: 4511965 (1965-04-01), Rajaram

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