That is very cool! George
> On May 10, 2021, at 11:26 AM, Mattis Lind via cctalk <cctalk@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