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- UCSB Computer
- NETWORK WORKING GROUP Research Lab.
- REQUEST FOR COMMENTS # 311 Roland F. Bryan
- NIC #9341 29 February 1972
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- NEW CONSOLE ATTACHMENTS TO THE UCSB HOST
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- The MLC/360M
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- 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.).
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- 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.
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- 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.
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- New Consoles
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- In addition to our standard attachments, which are mostly Culler-Fried
- graphic display consoles and educational classrooms
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- [Page 1]
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- using such consoles, we have a Tektronix 4002A and an NIH General
- Purpose Graphics Terminal (GPGT).
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- 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.
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- 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.
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- [ 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 ]
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- [Page 2]
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