Data transfer error check

Details Data transfer error check Data transfer error check

1975-03-06

1976-07-20

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

G06F 1110

Patent

active

039709892

ABSTRACT:
A business machine for communicating with remote and/or local data devices. A multiplexer selects the device to communicate with the business machine and sequences the operation of the machine through its several steps under control of a central processing unit. Those data devices with which the business machine communicates on a party line are coupled to the multiplexer through a communications controller which detects Attention signal, requests access to the memory, and in response to acknowledgement of access, transfers characters between the data device and the memory. The controller receives a block check character but generates a modified block check character which simplifies the utilization of that check. A video display can be provided with the business machine. The business machine is organized to permit clearing of the display screen independently of clearing of the corresponding memory locations and to permit rapid scrolling of text on the display screen, even when a relatively low speed microprocessor is utilized for the central processing unit.

REFERENCES:
patent: 2977047 (1961-03-01), Bloch
patent: 3147460 (1964-09-01), Scott
patent: 3418630 (1968-12-01), Van Duuren
patent: 3831144 (1974-08-01), En

Affiliated with

Also associated with

Rating

Data transfer error check does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data transfer error check, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data transfer error check will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-560422