Interface card for scanner

Details Interface card for scanner Interface card for scanner

1991-09-30

1994-04-12

Harrell, Robert B.

Boots, shoes, and leggings

364DIG2, 3649207, G06F 1564

Patent

active

053033663

ABSTRACT:
An interface card communicates a scanner with a MACINTOSH computer. The scanner previously sends status value and 8-byte redundant data to the interface card before transmitting the image data. The 8-byte redundant data is not acceptable to the MACINTOSH computer and is converted into irregular image on the screen. In addition to a CPU, a memory, an address decoder, a counter and status registers, a S-to-P converter and an image data receiver, the interface card also has a circuit which consists of four AND gates, four flip-flops and a counter. The scanner sends a step trigger signal *ST and a synchronous signal *AR before sending data to the interface card. Therefore, the circuit processes the *ST and *AR signals and counts the clock pulses for transmitting redundant data so as to delete these data from the interface card.

REFERENCES:
patent: 4760467 (1988-07-01), Marazz et al.
patent: 5034967 (1991-08-01), Cox et al.

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