Topic summary
GE 635
Extracted from the Wikipedia article GE-600 series.
Unix
In 1969, Ken Thompson had also written a video game, Space Travel, under the GECOS operating system on the smaller GE 635 machine. This had the problem that a typical game cost $75 ($658.50 in 2025) worth of billable CPU runtime. When he learned that Visual and Acoustics Research department had a small PDP-7 that was largely unused, he began to rewrite the game for this machine. This was initially performed by building a binary for the PDP-7 using a cross compiler on the 635, and then moving the resulting code to the PDP-7 using paper tape.