Accession Number:

ADA224007

Title:

Project for Development of New Protocol Hardware and Software for LSI-II to Accommodate AUTODIN II ADCCP-HDLC, and X.25

Descriptive Note:

Final rept.

Corporate Author:

ASSOCIATED COMPUTER CONSULTANTS SANTA BARBARA CA

Personal Author(s):

Report Date:

1983-02-09

Pagination or Media Count:

6.0

Abstract:

ACC produces a plug-in microprocessor for the PDP-11 UNIBUS, referred to as the UMC, which has been programmed to operate as an X.25 controller levels 1, 2, and 3. ACC has an IO driver for this X.25 controller for use on the RSX-11M operating system. ACC also produces a Multi-Channel Direct Memory Access MDMA controller for the LSI-11. The MDMA allows the attachment and servicing, by the LSI-11, of subordinate interface cards. These are an XQ1822 board for ARPANET connection, and a pair of boards XQNTDSI, XQNTDSO for 32- bit NTDS operations. ARPA has the requirement for operation of both the X.25 protocol and an HDLC type of connection on the LSI-11. ACC was contracted to develop a method for implementing an LSI-11 version of the UMC hardware. This LSI-11 based device was to be capable of operating with the software presently in use on the PDP-11 and UMC. To accomplish this ACC designed and implemented a working prototype of such a system for ARPANET use.

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE