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Ersatz-11 is a simulator for the PDP-11; it runs under either Windows, Linux, MS-DOS, OS/2, or directly on PC hardware.

Although it is principally oriented toward commercial use (for users who want to migrate existing applications from aging PDP-11 hardware), there is a free 'Demo' version, which may be used for unlimited personal/hobby use.

It supports a very wide range of simulated disks, tapes, serial lines; and there is even a simulated PDP-11/74 (experimental feature provided without support)

Limits of the Demo version

  • 30-day limit on commercial use
  • One of each disk/tape controller type
  • 256 MB maximum total size of all disks
  • No support for QBUS and UNIBUS hardware adapters

External links