Channel and control unit having a first I/O program protocol for

Details Channel and control unit having a first I/O program protocol for Channel and control unit having a first I/O program protocol for

1991-11-26

1992-11-17

Fleming, Michael R.

Boots, shoes, and leggings

395325, 3642842, 3642291, 3642383, 364228, 3642408, 364DIG1, G06F 1310, G06F 1342

Patent

active

051650223

ABSTRACT:
A computer system has a universal channel and control unit to interface, with a minimum complexity, to a plurality of different I/O adapters such as a Token Ring adapter or an Ethernet adapter. The system comprises a main processor with main memory, an I/O processor coupled to the main processor by a bus, and a channel program which runs on the I/O processor. The channel program accesses the processor and main memory. The channel program and main processor communicate with a first I/O program protocol. A control unit program also runs on the I/O processor and interfaces the channel program to a plurality of different I/O adapters with a second relatively simple, universal I/O program protocol. Each of the I/O adapters also has a different I/O program protocol than the other I/O adapters and the first I/O protocol, for communication with their respective device.

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