Fig D-1: A PDP-11/70 Console.These display and switch consoles were the hallmark of the PDP-11 computers in the 70ties. Picture courtesy of Henk Gooijen, see also Henk's PDP-11 collection.


The project contains the VHDL code for a complete DEC PDP-11 system: a PDP-11/70 CPU with memory management unit, but without floating point unit, a complete set of mass storage peripherals (RK11/RK05, RL11/RL02, RK70/RP06, TM11/TU10) and a basic set of UNIBUS peripherals (DL11, LP11, PC11), and last but not least a cache and memory controllers for SRAM and PSRAM. The design is FPGA proven, runs currently on Digilent Arty , Basys3 , Nexys4 DDR , Nexys4 , Nexys3 , Nexys2 and S3board boards. See section Complete Systems for more information.

5th Edition UNIX and 2.11BSD UNIX are known to boot, see section Running Systems for more information.

This is a retrocomputing project, rebuilding hardware from the late 70s and running historical software. To get into the tune see Figure D-1, a 11/70 console, and Figure F-2, a baseline system setup.

Detailed Information

For more details see the sections:

Latest News

For project news look into the w11 blog, the latest items are:

The work on the CPU and SoC triggered several related activities

Major Milestones

Being a 'leisture time project' things evolve at a modest pace. Key milestone so far were:

Date Milestone
Dec-2016 moved project from OpenCores to GitHub, now under wfjm/w11.
Jun-2015 added RH70 + RP/RM disks; TM11/TU10 tapes; now complete mass storage system.
Mar-2015 use Vivado; Artix-7 ports added (for Basys3 and Nexys4); added RL01/RL02 disks.
Apr-2013 new C++/Tcl backend server, w11a designs operate with rlink over USB.
Jan-2012 Cypress FX2 USB controller support added, rlink and config over USB.
Dec-2011 Spartan-6 port of w11a added (for Digilent Nexys3 board).
Jul-2010 OpenCores project w11 created; w11a V0.5 tagged and released.
May-2010 w11a systems ported to Digilent Nexys2 board; lots of cleanup.
Sep-2009 2.11BSD UNIX boots to multi-user mode on w11a on FPGA.
Aug-2009 UNIX 5th Edition boots on w11a on FPGA.
Jun-2009 Found 11/70MP system manual on bitsavers. Most of IIST implemented. Too early, but fun.
Dec-2008 Finished the last of three 2.11BSD patches, now 2.11BSD boots of a RK05 disk set and runs on a 11/70 without FPP in simh.
Mar-2008 Full system with CPU, cache, and minimal I/O system runs on FPGA.
Sep-2007 rri (rbus+rlink) implemented, w11a runs on FPGA (Digilent S3BOARD).
Sep-2006 CPU and MMU implemented, simple test codes run.
Jun-2006 Re-discovered a pile of PDP-11 manuals in a forgotten box full of old paper work. This triggered the idea, and with simh, ghdl and bitsavers at hand, 2.11BSD as target OS and a 11/74 picture as desktop background it quickly became a project.