Ersatz-11
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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
