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SIMH is a highly portable, multi-system emulator
Emulator

An emulator duplicates the functions of one system using a different system, so that the second system behaves like the first system. This focus on exact reproduction of external behavior is in contrast to some other forms of computer simulation, which can concern an abstract model of the system being simulated....
 which runs on Windows
Microsoft Windows

Microsoft Windows is a series of software operating systems and graphical user interfaces produced by Microsoft. Microsoft first introduced an operating environment named Windows in November 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces ....
, Linux
Linux

Linux is a generic term referring to Unix-like computer operating systems based on the Linux kernel. Their development is one of the most prominent examples of free and open source software collaboration; typically all the underlying source code can be used, freely modified, and redistributed by anyone under the terms of the GNU GPL license...
, Mac OS X
Mac OS X

Mac OS X is a line of computer operating systems developed, marketed, and sold by Apple Inc., and since 2002 has been included with all new Macintosh computer systems....
, FreeBSD
FreeBSD

FreeBSD is a Unix-like free software operating system descended from AT&T Unix via the Berkeley Software Distribution branch through the 386BSD and Berkeley Software Distribution#4.4BSD and descendants operating systems....
, OpenBSD
OpenBSD

OpenBSD is a Unix-like computer operating system descended from Berkeley Software Distribution , a Unix derivative developed at the University of California, Berkeley....
, NetBSD
NetBSD

NetBSD is a freely redistributable, open source version of the Unix-derivative Berkeley Software Distribution computer operating system. It was the second open source BSD descendant to be formally released, after 386BSD, and continues to be actively developed....
, OpenVMS
OpenVMS

OpenVMS , previously known as VAX-11/VMS, VAX/VMS or VMS, is the name of a high-end computer server operating system that runs on the VAX and DEC Alpha families of computers, developed by Digital Equipment Corporation of Maynard, Massachusetts, Massachusetts , and most recently on Hewlett-Packard systems built around the In...
, and other operating systems. It is maintained by Bob Supnik, a former DEC
Digital Equipment Corporation

Digital Equipment Corporation was a pioneering United States company in the computer industry. It is often referred to within the computing industry as DEC ....
 engineer & DEC vice president and has been in development in one form or another since the 1960s.

was based on a much older systems emulator called MIMIC
Mimic

Biology mimicry occurs when a group of organisms, the mimics, have evolution to share common perception characteristics with another group, the models, through the selection action of a signal-receiver or dupe....
, which was written in the late 1960s at Applied Data Research.






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Encyclopedia


SIMH is a highly portable, multi-system emulator
Emulator

An emulator duplicates the functions of one system using a different system, so that the second system behaves like the first system. This focus on exact reproduction of external behavior is in contrast to some other forms of computer simulation, which can concern an abstract model of the system being simulated....
 which runs on Windows
Microsoft Windows

Microsoft Windows is a series of software operating systems and graphical user interfaces produced by Microsoft. Microsoft first introduced an operating environment named Windows in November 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces ....
, Linux
Linux

Linux is a generic term referring to Unix-like computer operating systems based on the Linux kernel. Their development is one of the most prominent examples of free and open source software collaboration; typically all the underlying source code can be used, freely modified, and redistributed by anyone under the terms of the GNU GPL license...
, Mac OS X
Mac OS X

Mac OS X is a line of computer operating systems developed, marketed, and sold by Apple Inc., and since 2002 has been included with all new Macintosh computer systems....
, FreeBSD
FreeBSD

FreeBSD is a Unix-like free software operating system descended from AT&T Unix via the Berkeley Software Distribution branch through the 386BSD and Berkeley Software Distribution#4.4BSD and descendants operating systems....
, OpenBSD
OpenBSD

OpenBSD is a Unix-like computer operating system descended from Berkeley Software Distribution , a Unix derivative developed at the University of California, Berkeley....
, NetBSD
NetBSD

NetBSD is a freely redistributable, open source version of the Unix-derivative Berkeley Software Distribution computer operating system. It was the second open source BSD descendant to be formally released, after 386BSD, and continues to be actively developed....
, OpenVMS
OpenVMS

OpenVMS , previously known as VAX-11/VMS, VAX/VMS or VMS, is the name of a high-end computer server operating system that runs on the VAX and DEC Alpha families of computers, developed by Digital Equipment Corporation of Maynard, Massachusetts, Massachusetts , and most recently on Hewlett-Packard systems built around the In...
, and other operating systems. It is maintained by Bob Supnik, a former DEC
Digital Equipment Corporation

Digital Equipment Corporation was a pioneering United States company in the computer industry. It is often referred to within the computing industry as DEC ....
 engineer & DEC vice president and has been in development in one form or another since the 1960s.

History


The Origin of SIMH

SIMH was based on a much older systems emulator called MIMIC
Mimic

Biology mimicry occurs when a group of organisms, the mimics, have evolution to share common perception characteristics with another group, the models, through the selection action of a signal-receiver or dupe....
, which was written in the late 1960s at Applied Data Research.

SIMH on the PC

SIMH was started in 1993 with the purpose of preserving minicomputer
Minicomputer

A minicomputer is a class of multi-user computers that lies in the middle range of the computing spectrum, in between the largest multi-user systems and the smallest single-user systems ....
 hardware and software which was fading into obscurity.

Emulated Hardware

SIMH emulates the following hardware from the following companies.

Data General

  • Nova
    Data General Nova

    The Data General Nova was a popular 16-bit minicomputer built by the United States company Data General starting in 1969. The Nova was packaged into a single rack mount case and had enough power to do most simple computing tasks....
  • Eclipse
    Data General Eclipse

    The Data General Eclipse line of computer by Data General were 16-bit minicomputer released in early 1974 and sold until 1988. The Eclipse was based on many of the same concepts as the Data General Nova, but included support for virtual memory and multitasking more suitable to the small office than the lab....


Digital Equipment Corporation

  • PDP-1
    PDP-1

    The PDP-1 was the first computer in Digital Equipment Corporation's Programmed Data Processor series and was first produced in 1960. It is famous for being the computer most important in the creation of Hacker culture, at Massachusetts Institute of Technology, Bolt, Beranek and Newman and elsewhere....
  • PDP-4
    Programmed Data Processor

    Programmed Data Processor was the name of a series of minicomputers made by Digital Equipment Corporation. The name 'PDP' intentionally avoided the use of the term 'computer' because at the time of the first PDPs, computers had a reputation of being large, complicated, and expensive machines, and the venture capitalists behind Digital would...
  • PDP-7
    PDP-7

    The Digital Equipment Corporation PDP-7 is a minicomputer produced by Digital Equipment Corporation. Introduced in 1965, the first to use their Flip Chip technology, with a cost of only $72,000 USD, it was cheap but powerful....
  • PDP-8
    PDP-8

    The PDP-8 was the first successful commercial minicomputer, produced by Digital Equipment Corporation in the 1960s. DEC introduced it on 22 March 1965, and sold more than 50,000 systems, the most of any computer up to that date....
  • PDP-9
    Programmed Data Processor

    Programmed Data Processor was the name of a series of minicomputers made by Digital Equipment Corporation. The name 'PDP' intentionally avoided the use of the term 'computer' because at the time of the first PDPs, computers had a reputation of being large, complicated, and expensive machines, and the venture capitalists behind Digital would...
  • PDP-10
    PDP-10

    The PDP-10 was a mainframe computer manufactured by Digital Equipment Corporation from the late 1960s on; the name stands for "Programmed Data Processor model 10"....
  • PDP-11
    PDP-11

    The PDP-11 was a series of 16-bit minicomputers sold by Digital Equipment Corporation from 1970 into the 1990s. Though not explicitly conceived as successor to DEC's PDP-8 computer in the Programmed Data Processor series of computers , the PDP-11 replaced the PDP-8 in many Real-time computing....
  • PDP-15
    Programmed Data Processor

    Programmed Data Processor was the name of a series of minicomputers made by Digital Equipment Corporation. The name 'PDP' intentionally avoided the use of the term 'computer' because at the time of the first PDPs, computers had a reputation of being large, complicated, and expensive machines, and the venture capitalists behind Digital would...
  • VAX
    VAX

    VAX was an instruction set architecture developed by Digital Equipment Corporation in the mid-1970s. A 32-bit complex instruction set computer ISA, it was designed to extend or replace DEC's various Programmed Data Processor ISAs....


GRI Corporation

  • GRI-909


IBM

  • 1401
    IBM 1401

    The IBM 1401, the first member of the IBM 1400 series, was a variable wordlength decimal computer that was announced by International Business Machines on October 5, 1959....
  • 1620
    IBM 1620

    The IBM 1620 was announced by International Business Machines on October 21, 1959 and marketed as an inexpensive "scientific computer". After a total production of about two thousand machines, it was withdrawn on November 19, 1970....
  • 1130
    IBM 1130

    The IBM 1130 Computing System was introduced in 1965. It was IBM's least-expensive computer to date, and was aimed at price-sensitive, computing-intensive technical markets like education and engineering....
  • 7090/7094
    IBM 7090

    The IBM 7090 was a second-generation transistorized version of the earlier IBM 709 vacuum tube mainframe computers and was designed for "large-scale scientific and technological applications"....
  • System/3
    System/3

    File:IBM System3.JPGThe IBM System/3 was a low-end business computer aimed at new customers and organizations that still used IBM 1400 series computers or unit record equipment....


Interdata

  • 16-bit series
  • 32-bit series
    Interdata 7/32 and 8/32

    The Model 7/32 and Model 8/32 were 32-bit minicomputers developed by Interdata, Inc. of Oceanport, new jersey during the 1970s. They are primarily remembered for being the first 32-bit minicomputers, and the first non-Programmed Data Processor computers to run Version 6 Unix....


Hewlett-Packard

  • 2116
  • 2100
    HP 2100

    The HP 2100 was a series of minicomputers produced by Hewlett-Packard from the mid 1960s to early 1990s. The 2100 was also a specific model in this series....
  • 21MX


Honeywell

  • H316
    Honeywell 316

    The Honeywell 316 was a popular 16-bit minicomputer built by Honeywell starting in 1969. It is part of the Series 16 which includes the Models 116, 316, 416, 516 and 716....
  • H516


MITS

  • Altair 8800
    Altair 8800

    The Micro Instrumentation and Telemetry Systems Altair 8800 was a microcomputer design from 1975, based on the Intel 8080 central processing unit and sold as a mail-order kit through advertisements in Popular Electronics, Radio-Electronics and other hobbyist magazines....
     both Intel 8080
    Intel 8080

    The Intel 8080 was an early microprocessor designed and manufactured by Intel. The 8-bit microprocessor was released in April 1974 running at 2 megahertz , and is generally considered to be the first truly usable microprocessor....
     and Zilog Z80
    Zilog Z80

    The Zilog Z80 is an 8-bit microprocessor designed and sold by Zilog from July 1976 onwards. It was widely used both in desktop and embedded computer designs as well as for military purposes....
     versions


Royal-Mcbee

  • LGP-30
    LGP-30

    The LGP-30, standing for Librascope General Purpose and then Librascope General Precision, was an early "off the shelf" computer manufactured by the Librascope company of Glendale, California , and sold and serviced by the Royal Precision Electronic Computer Company, a joint venture with the Royal McBee division of the Royal Typew...
  • LGP-21


Scientific Data Systems

  • SDS 940
    SDS 940

    The SDS 940 was Scientific Data Systems' first machine designed to support time sharing directly, and was based on the SDS 930's 24-bit CPU built primarily of integrated circuits....


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