mirror of
https://github.com/open-simh/simh.git
synced 2026-01-17 00:34:02 +00:00
100f351575
Recent analysis of the 2.9BSD kernel revealed that RP11 was expected to interrupt on control RESET function if IE bit was also set. Documentation was not very clear of the fact, saying in one place that RESET+GO does not interrupt (which is not contradictory with the above because it does not mention IE). In other place, however, it says that IE always causes interrupt when DONE is asserted. Thus, since RESET does assert DONE, an interrupt should be posted if IE is set. The autoconfig binary from 2.9BSD uses this feature of RP11 to check the presence of the controller. Formerly RESET was always clearing RPCS with DONE unconditionally, and that reset IE as well. This patch makes sure that the IE bit is preserved, and if set, it posts an interrupt when RESET asserts DONE.
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.
