SPACEWAR! Switch Boxes for a PDP-12

[Christian Corti]

On Sun, 23 Sep 2018, Michael Thompson wrote:
> We modified the source
> <http://www.ricomputermuseum.org/Home/equipment/dec-pdp-12/dec-pdp-12-source-code/SPCWR3.12?attredirects=0&d=1>
> from D.E. WREGE
> <http://www.pdp8.net/pdp8cgi/os8_html/SPCWR3.PA?act=file;fn=images/jby/jbyos8.tu56;to=ascii;blk=510,131,0;plain=1>
> to use the LINC SXL instruction to read the PDP-12 GPIO signals, and
> prototyped two switch boxes using recycled toggle switches. This works
> great, so now we need to make better switch boxes.
[...]

We did something similar for our LAB-8/E, but much simpler. We just hooked 
up two ordinary game joysticks (digital ones like for the C64 or Amiga) to 
the parallel input interface and modified the code to also read that 
input :-)

Christian