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                                                UCSB Computer

NETWORK WORKING GROUP Research Lab. REQUEST FOR COMMENTS # 311 Roland F. Bryan NIC #9341 29 February 1972

 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
 New Consoles
 In addition to our standard attachments, which are mostly Culler-Fried
 graphic display consoles and educational classrooms
                                                              [Page 1]
 using such consoles, we have a Tektronix 4002A and an NIH General
 Purpose Graphics Terminal (GPGT).
 The Tektronix terminal can now be operated on the ARPANET and will
 provide our users with upper and lower case ASCII for easier operation
 with other sites.  A report on this console's capability will be
 The GPGT was developed by the University of IOWA for use in
 Bio-Medical applications.  The unit is a delay-line refreshed video
 display with graphic capability and is the only dynamic type display
 in use on our host computer at present.  We are evaluating its
 performance in our On-Line System environment.  Since a user at this
 terminal is also able to reach into the network, we will have some
 future comments on its operation for interested persons.
     [ This RFC was put into machine readable form for entry ]
     [ into the online RFC archives by BBN Corp. under the   ]
     [ direction of Alex McKenzie.                   12/96   ]
                                                              [Page 2]
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