New Console Attachments to the USCB Host (RFC0311)
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2019-Feb-12
Internet Society Requests For Comment (RFCs)
UCSB Computer NETWORK WORKING GROUP Research Lab. REQUEST FOR COMMENTS # 311 Roland F. Bryan NIC #9341 29 February 1972
NEW CONSOLE ATTACHMENTS TO THE UCSB HOST
The MLC/360M ---------------
The UCSB 360-75 is equipped with an interface unit that allows attachment of any type of I/O device to the Multiplexor Channel and for that device to be operated by program control as though it were a standard IBM Control Unit. The interface, referred to as the Multi-Line Controller/360M (MLC/360M), operates on the Multiplexor Channel and provides 32 independently addressed I/O connections that are grouped into 16 pairs to accommodate full- duplex I/O operation. Each input group has a 16-bit input buffer plus related synchronizing and control logic to make it a stand-alone control unit on the 360 channel. Similarly, each output group has a 32-bit buffer plus logic. Attachment is achieved by connection through a data-set type connector and I/O signal levels conform to EIA standards (RS-232 Spec.).
Both the I/O group hardware and the supporting software for the MLC/360M are readily modified to produce any variations required for attachment and operation of non-standard devices.
Since our primary support was for 201B data-sets at 2400 baud, we first implemented the 16 I/O group pairs to accommodate this type of modem in our time-shared user environment. The I/O groups have now been variously modified to support a wide range of applications, from 300 baud acoustic coupled use to 9600 baud for multi-station classroom operation.
New Consoles ---------------
In addition to our...