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The disk type mask width (UNIT_W_DTYPE) was increased to six (6) bits, doubling the possible number of disk types definable to sixty-four (64). The RF35 was not entered in either the drv_tab or drv_types tables, causing any set command issued for the drive type defined after the RF35 -- the RF71 through RF73, as well as any disk defined after the RF73 -- to act incorrectly. The ESE20 solid state disk and ESE50 series of solid state disks are added based on simple drive geometry and size information without any parameters for bad block management (not that it is used in the simulation anyways). The ESE50 series drives are labelled as they are in the MSCP specification document, the Ultrix-32 v4.5 disktab, and the Media Type noted in the "ESE50 SDI Solid State Disk User Guide" (EK-ESE50-UG.B01): * ESE50-A: ESE52 * ESE50-B: ESE56 * ESE50-D: ESE58 The RD33 is added based on the geometry of the Microscience HH-1090 hard disk drive, with the bad block management information calculated from the bad block information for the other RDxx series drives. The RX18 is added based on the geometry of the RX180 floppies in the VT-180 "Robin" CP/M system, which are noted in the MSCP specification document as a possible device. Specific information is taken from the "VT-180 Series Technical Manual" (EK-VT18X-TM-001).
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.