PDP 8E Simulator for Mac

By Bernhard Baehr Free

Developer's Description

The PDP-8/E Simulator is an emulator for the Digital Equipment Corporation PDP-8/E minicomputer, a famouse computer of the early 1970 years. The simulator, first released 1994, provides a comfortable user interface for running, writing and debugging PDP-8 software on a Mac and to learn about the internal functioning of a computer. It has a console with switches and flashing lights enabling the user to operate the PDP-8 like a hardware machine.
Maybe the simulator is of interest for a larger audience using it for educational purposes or as a remembrance to the good old time of the computer age. The simulator and its source code are published under the GNU General Public License.

Full Specifications

What's new in version 2.2

This is the 25th anniversary of the PDP-8/E Simulator, and version 2.2 contains the following improvements:

  • The PDP-8/E Simulator now has a Real Time Clock plug-in with various clock models and frequencies
  • Improved real time performance (finally without any busy waiting) enables the simulator to pass the MAINDEC-8E-D8AC-PB DK8-E Clocks Diagnostics for all clock frequencies
  • An improved plug-in API enables plug-ins to be written in Swift
  • A Swift version of the Memory Content demo plug-in was added
  • For the RK05 disk drives, now a gauge indicates the last accessed track of the disk and the kind of access (Read, Write or Seek)
  • The ASR-33 no longer replaces "--" with "-" when "Use smart quotes and dashes" is enabled in the "Keyboard" System Preferences
  • Fixed a very rare situation that could cause two PDP-8/E run threads to run simultaneously, causing total confusion
  • Many minor bugs fixed, including typographic errors and visual glitches with Dark Mode
  • Improved compatibility with macOS 10.14 "Mojave" and macOS 10.15 "Catalina"


Release December 9, 2019
Date Added December 9, 2019
Version 2.2

Operating Systems

Operating Systems Macintosh
Additional Requirements
  • macOS Catalina
  • macOS Mojave
  • macOS High Sierra
  • macOS Sierra
  • OS X El Capitan
  • OS X Yosemite
  • OS X Mavericks
  • OS X Mountain Lion
  • OS X Lion
  • OS X Snow Leopard


Total Downloads 357
Downloads Last Week 0
Report Software

Related Software





ConverTable Planets

ConverTable Planets

G Power

G Power

User Reviews

4 User Votes
5 Star
4 Star
3 Star
2 Star
1 Star

Get the best price on everything

Shop your favorite products and we’ll find the best deal with a single click. Designed to make shopping easier.