Communications: electrical – Digital comparator systems
Patent
1973-11-19
1976-02-03
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 304
Patent
active
039368033
ABSTRACT:
A data processing system where transfers of information are made between I/O devices and system storage through channels is a channel unit having common apparatus shared among all the channels. The common apparatus includes a sequentially accessed state memory and a plurality of processors. The state memory includes a memory location for each channel. The processors have access to different parts of the state memory and perform functions in response to stored information. A data access processor controls transfers between system storage and the channel unit. A controller interface processor controls transfers between the channel unit and I/O devices. The quantity of information to be transferred for each channel is stored in the state memory. Each time a portion of the total transfer is completed, a count field in the state memory is updated. In one embodiment, only the low-order bits of the total count are stored in the state memory and the balance or high-order bits of the count are stored in channel memory.
REFERENCES:
patent: 3587044 (1971-06-01), Jenkins
patent: 3680057 (1972-07-01), Blessin et al.
patent: 3699530 (1972-10-01), Capowski et al.
patent: 3786435 (1974-01-01), Sherman
Katzman James A.
Yoshioka Yoshiro
Amdahl Corporation
Sachs Michael C.
Shaw Gareth D.
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