Post #1268829

2026-02-02 17:32 UTC

@larsbrinkhoff got into the act with Javascript and PDP-10 assembler versions. The sources are on Github, and a video of the PDP-10 is on YouTube. (Lars, what display are you emulating on the '10?) https://github.com/larsbrinkhoff/bubble-universe https://www.youtube.com/watch?v=hIU7iYWZWSY 🧵 4/N #BubbleUniverse #Javascript #PDP10

Replies (2)

@kbob@chaos.social 2026-02-02 17:36

Several others have implemented it; it seems to be popular with the retrocomputing crowd. I found out about it when @PaulaMaddox ported it to her FPGA 6502 simulator a few days ago. 🧵 5/N #BubbleUniverse #FPGA https://mastodon.social/@PaulaMaddox/115984089839706205

Open ##1268830
@larsbrinkhoff@mastodon.sdf.org 2026-02-02 18:01

@kbob It's not a standard PDP-10 thing for sure. The display is the "color scope" by DEC. The story goes (not confirmed) that two were made as an experiment, and one was given to MIT's AI lab (apparently a popular dumping ground for DEC hardware). This would have been around 1970, give or take a few years. You can think of it as a point-plotting device, similar to the Type 30 used with the PDP-1, except lower resolution and four bits each for RGB. The tube was supposedly a regular NTSC.

Open ##1268882