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This commit extends the existing DUP11/DPV11 support to add support for HDLC framing. There is no requirement to support bit/byte stuffing, so the aim is simply to encapsulate/decapsulate the datalink frame provided by the host driver. DDCMP has been regression tested on VMS, RSX and TOPS20, and the HDLC mode was developed and tested with VAX/VMS DECnet Phase V, only using the HDLC datalink implementation. In theory this support is sufficient to allow Phase IV/V P.S.I and even VMS/SNA to be used, but these remain to be demonstrated.
Open SIMH machine simulator
This is the codebase of SIMH, a framework and collection of computer system simulators.
SIMH was created by Bob Supnik, originally at Digital Equipment Corporation, and extended by contributions of many other people. It is now an open source project, licensed under an MIT open source license (see LICENSE.txt for the specific wording). The project gatekeepers are the members of the SIMH Steering Group. We welcome and encourage contributions from all. Contributions will be covered by the project license.
The Open SIMH code base was taken from a code base maintained by Mark Pizzolato as of 12 May 2022. From that point onward there is no connection between that source and the Open SIMH code base. A detailed listing of features as of that point may be found in SIMH-V4-status.