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                                                  UCSB ComputerNETWORK WORKING GROUP                             Research Lab.REQUEST FOR COMMENTS # 311                        Roland F. BryanNIC #9341                                         29 February 1972NEW 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 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   forthcoming.   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]