Data processing systems

Details Data processing systems Data processing systems

1975-07-01

1977-08-09

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 916, G06F 300

Patent

active

040414647

ABSTRACT:
Several forms of scanner are known: exception reporting, 3-cycle scanning with block exception reporting and response-mode reporting. Additionally positive-edge reporting is now required. The present invention enables the achievement of all these requirements within a rationalized scheme involving a considerably extended field size, and therefore, using a "last-look" 256 or 512 bit shift-register. This is employed in conjunction with a pre-programmed read-only memory, which stores for each different field-type served by the scanner a program relevant to that field. Each program address is formed by injecting the state of the scanned point as a least significant bit carry into an adder fed with (i) the N-1 most significant bits of the previous address in a sequence control register and (ii) an address increment value read from the location previously addressed while the current state of the last-look shift register is used as the least significant bit. Each program location stores an address increment value and last-look shift register update bit.

REFERENCES:
patent: 3673577 (1972-06-01), Edstrom
patent: 3737869 (1973-06-01), Trelut et al.
patent: 3768079 (1973-10-01), Bittermann et al.
patent: 3922644 (1975-11-01), Borbas et al.

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