The IEEE-488 interface bus, also known as the General Purpose Interface Bus 'GPIB' is an 8 bit wide byte serial, bit parallel interface system which incorporates: 5 control lines 3 handshake lines 8 bi-directional data lines.
The entire bus consists of 24
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http://www.interfacebus.com/Design_Connector_GPIB.html
02/18/2003