Boots – shoes – and leggings
Patent
1977-01-05
1980-08-19
Nusbaum, Mark E.
Boots, shoes, and leggings
340147R, G06F 300
Patent
active
042187400
ABSTRACT:
A peripheral interface adaptor (PIA) circuit for data processing systems contains memory elements or control registers allowing modification under program control of the logical functions of the PIA.
The peripheral interface adaptor includes a plurality of system data bus buffer circuits coupled to a system data bus and further includes peripheral interface buffer circuits coupled to a bidirectional peripheral data bus. The direction of data flow in the peripheral data bus is controlled by a data direction register. Data from the system data bus buffer is entered into an input register, and is transferred from there to an input bus coupled to the control register, a data direction register and a data register. Data from the peripheral data bus, the data direction register and the control register are transferred via an output bus to the system data bus buffers. Control signals are generated by select, read/write control, and register select logic which provides signals on a control bus coupled to the input register, the data register, the control register, and the data direction register to control data transfers between the various buses, registers, and buffer circuits.
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Bennett Thomas H.
Carlow Earl F.
Hepworth Edward C.
Mensch, Jr. William D.
Peddle Charles I.
Motorola Inc.
Nielsen Walter W.
Nusbaum Mark E.
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