Editing PDP-10 (section)

== Emulation or simulation ==
The software for simulation of historical computers, [[SIMH]], contains modules to emulate all the PDP-10 CPU models on a Windows or Unix-based machine. Copies of DEC's original distribution tapes are available as downloads from the Internet so that a running TOPS-10 or TOPS-20 system may be established. ITS and WAITS are also available for SIMH.<ref>{{Cite web|url=http://github.com/PDP-10/its|title = Incompatible Timesharing System|website = [[GitHub]]|date = January 5, 2022}}</ref><ref>{{Cite web|url=http://sky-visions.com/dec/waits/|title=Index of /Dec/Waits}}</ref> A PDP-10 front panel<ref>{{Cite web|url=https://obsolescence.wixsite.com/obsolescence/pidp10|title = PiDP-10: Recreating the PDP-10 at the MIT Lab|date = September 23, 2024}}</ref> replica for the KA10 processor is available for the [[SIMH]] emulation running on a [[Raspberry Pi]].

Ken Harrenstien's KLH10 software for Unix-like systems emulates a KL10B processor with extended addressing and 4 MW of memory or a KS10 processor with 512 KW of memory. The KL10 emulation supports v.442 of the KL10 microcode, which enables it to run the final versions of both TOPS-10 and TOPS-20. The KS10 emulation supports both ITS v.262 microcode for the final version of KS10 ITS and DEC v.130 microcode for the final versions of KS TOPS-10 and TOPS-20.<ref>Tim Shoppa [http://www.columbia.edu/kermit/ftp/e/klh10.txt "Announcing KLH10"], November 10, 2001. Retrieved April 4, 2009.</ref>

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