PDP-11 SPACEWAR running again!

On May 10, 2021, at 11:26 AM, Mattis Lind via cctalk <cctalk at classiccmp.org> wrote: Today I finally got the SPACEWAR version for PDP-11/10 running again on my PDP-11/05 with AR11 board. I played a couple of rounds together with my daughter. She was better than me. Quite hard game IMHO. https://youtu.be/fTiHRAKjyho Bill Seiler and Larry Bryant wrote this version in 1974 and submitted it to DECUS. It was believed to have been lost to history. But Bill had saved the printouts from the PAL11 assembler. He sent me scans of these printouts as pdf files. I then transcribed it into source files and iterated several times in SimH to get a clean build and link. I got some help from people here doing OCR on some files. But the lines mostly confused the OCR process so a lot of errors was introduced. It turned out that it was easier to just transcribe the whole lot by hand than finding and correcting errors. The AR11 is somewhat different to the AD01 and AA11 that Bill and Larry used. AA11 has a 12 bit 2?s complement D/A while the AR11 is only 10 bits and not 2?s complement. I did some patches and eventually got everything right. I also connected a couple of analogue joysticks. The fire button is just short ciruiting the viper of the potentiometer to the 5V supply lead. The screen is a HP1332A vector screen. All the transcribed code, AR11 patches and build instructions are available on github. https://github.com/MattisLind/SPACEWAR It should be possible to adapt it to orher types of A/D and D/A hardware if anyone wishes to do so. However the gameplay might be harder when running on a faster PDP-11? Have fun! /Mattis