# w11: PDP 11/70 CPU and SoC

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### Overview
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 rather complete set of UNIBUS peripherals
(DL11, LP11, PC11, and DEUNA),
and last but not least a cache and memory controllers for SRAM, PSRAM and
SDRAM (via Xilinx MIG core).
The design is **FPGA proven**, runs currently on
Digilent Arty, Basys3, CmodA7, Nexys4, Nexys3, Nexys2 and S3board boards
and boots 5th Edition UNIX and 2.11BSD UNIX. 

For more information look into:
- w11 project [home page](https://wfjm.github.io/home/w11/)
  and [blog](https://wfjm.github.io/blogs/w11/)
- [change log](doc/CHANGELOG.md)
  and [installation notes](doc/INSTALL.md)
- guides to build bit files and test benches
  with [Xilinx Vivado](doc/README_buildsystem_Vivado.md)
  and [Xilinx ISE](doc/README_buildsystem_ISE.md)
- guides to [run test benches](doc/w11a_tb_guide.md)
  and to [boot operating systems](doc/w11a_os_guide.md)
- known issues [general](doc/README_known_issues.md)
  and [w11a CPU](doc/w11a_known_issues.md)
- the impatient readers can try their luck with the
  [quick start guide](doc/INSTALL_quickstart.md)

A short description of the directory layout
[is provided separately](https://wfjm.github.io/home/w11/impl/dirlayout.html),
the top level directories are

| Directory | Content |
| --------- | ------- |
| [doc](doc)     | documentation |
| [rtl](rtl)     | HDL sources (mostly vhdl) |
| [tools](tools) | many tools |

### Note on freecores/w11
The [freecores team](http://freecores.github.io/) created in 2014 a
copy of almost all OpenCores cores in Github under
[freecores](https://github.com/freecores). This created
[freecores/w11](https://github.com/freecores/w11)
which is 
[*outdated* and *not maintained*](https://github.com/freecores/w11/issues/1).
***Only [wfjm/w11](https://github.com/wfjm/w11) is maintained***.

### License
This project is released under the 
[GPL V3 license](https://www.gnu.org/licenses/gpl-3.0.html),
all files contain the disclaimer:

    This program is free software; you may redistribute and/or modify
    it under the terms of the GNU General Public License version 3.
    See License.txt in distribition directory for further details.

The full text of the GPL license is in this directory as
[License.txt](License.txt).