Browse Prior Art Database

New Console Attachments to the USCB Host (RFC0311) Disclosure Number: IPCOM000003507D
Original Publication Date: 1972-Feb-29
Included in the Prior Art Database: 2000-Sep-13
Document File: 2 page(s) / 3K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R.F. Bryan: AUTHOR


The MLC/360M ---------------

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 92% of the total text.

UCSB Computer


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

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 o...