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On macOS, tap devices for L2 networking are not supported out of the box. While a kext can be added to provide tap support, the kext experience is not very good; Apple has strongly recommended against their usage. As a replacement that's documented and recommended, Apple introduced the vmnet framework, intended for emulators and virtualization software explicitly. This API requires macOS 10.10, with bridged network support coming in macOS 10.15. This introduces basic support for vmnet.framework in SIMH. I've tested it by booting an emulated MicroVAX 3800 from an emulated InfoServer 150, where it was able to reach OpenVMS 7.3 standalone BACKUP.
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.
PLEASE NOTE
Do not contribute material taken from github.com/simh/simh unless you are the author of the material in question.
