Computer apparatus and method for replacing programs between mem

Details Computer apparatus and method for replacing programs between mem Computer apparatus and method for replacing programs between mem

1993-07-02

1997-01-07

Kim, Matthew M.

395488, 395442, G06F 1216

Patent

active

055926509

ABSTRACT:
A program replacement device is incorporated in a computer system having a CPU and a program memory in which first programs to be executed by the CPU are stored. The program replacement device includes a RAM employed as the program memory and having a write enable terminal, and a protection circuit interposed between the write enable terminal of the program memory and a write signal outputted from the CPU. The protection circuit includes a push switch for instructing program replacement with respect to the program memory, a pulse generating circuit for generating a pulse signal having a given time interval in response to an instruction from the push switch, and a gate circuit for making, only when the pulse signal is generated, the write signal outputted from the CPU valid with respect to the write enable terminal of the program memory. The program replacement device further includes an interruption generating circuit for generating in the CPU an interruption required to write second programs in the program memory in response to the instruction from the instruction section, thereby replacing the first programs by the second programs.

REFERENCES:
patent: 4229804 (1980-10-01), Kobayashi et al.
patent: 4725977 (1988-02-01), Izumi et al.
patent: 4796181 (1989-01-01), Wiedemer
patent: 4984193 (1991-01-01), Nakagawa
patent: 5131091 (1992-07-01), Mizuta
patent: 5150455 (1992-09-01), Morikawa et al.
patent: 5245582 (1993-09-01), Kimura
patent: 5276903 (1994-01-01), Shinagawa
patent: 5293601 (1994-03-01), Tsuyuguchi et al.
patent: 5349669 (1994-09-01), Arai et al.
patent: 5359726 (1994-10-01), Thomas
patent: 5377357 (1994-12-01), Nishigaki et al.
patent: 5386539 (1995-01-01), Nishi
patent: 5386541 (1995-01-01), Moridara
patent: 5410707 (1995-04-01), Bell
patent: 5426762 (1995-06-01), Nakagawa

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