He talks a bit about the psuedo-random generator [1] they used, including showing some code, but doesn't mention how the seed is set. Given this is an 8088 and in 1982, I guess there isn't a RTC and they wouldn't use persistent storage for that, so the seed is going to be taken based on startup ticks or something like that -- does anyone know?
If you were to plug in the cabinet and record it, is it going to make the identical sounds every time? (and if not, why not? that implies some external source of randomness)