page_title: SIMH
section_title: Emulated hardware
hierarchical_section_title: SIMH / Emulated hardware
caption_attribution_description: English: Version 6 Unix for the PDP-11, running in the SIMH PDP-11 simulator. The user ("ken") and home directory ("/usr/ken") for Ken Thompson are still present. Version 6 is considered an "Ancient Unix" and is no longer proprietary.
context_page_description: SIMH is a highly portable, multi-system emulator which runs on Windows, Linux, macOS, FreeBSD, OpenBSD, NetBSD and OpenVMS. It is maintained by Bob Supnik, a former DEC engineer and DEC vice president, and has been in development in one form or another since the 1960s.
context_section_description: SIMH emulates hardware from the following companies.
caption: Version 6 Unix for the PDP-11, running in SIMH
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