Project for Development of New Protocol Hardware and Software for LSI-II to Accommodate AUTODIN II ADCCP-HDLC, and X.25
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 I/O 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 XQ/1822 board for ARPANET connection, and a pair of boards (XQ/NTDSI, XQ/NTDSO) 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 09, 1983
- Accession Number
- ADA224007