This is a more difficult request than I had thought it would be. I will keep thinking about it. I hope someone thinks of something because games tend to be the demos everyone uses.
There were some less games such as bounce which simulated bounce of a ball, 3d plot to plot a function.
Went back last weekend. I never found the adjustment procedure for the tape reader so was doing it like I remembered for my 8/E. 8/I doesn't use the feed hole for strobing the data. It uses it for end of tape detection so during normal operation you shouldn't see feed holes. It uses stepper phase to strobe the data.
Tried to load over the console port from my laptop and tape wouldn't load. Tried echo toggle in program and found most of the time it detected the character being sent but received it as all 0's. Switched to teletype and it had similar faults but when the character was received it wasn't right. Switched to local and found the teletype had a stuck bit. Control did clear the stuck bit.
The 8/I problem was IOP4 pulse was not generated most of the time. Traced it to bad M310 in F16. The output pulse was misshaped. Tried the reader but it didn't want to work. Decided to check how my 8/I reader worked when I got back home so moved on to the LINC power supply for the rest of the day. Figured out on my machine that 8/I reader adjustment is different that 8/E. Adjusted System Source reader and still didn't behave. Since test equipment was with LINC supply decided to continue on with LINC. Ran out of time so didn't get to troubleshoot reader further.
Traced the inability to adjust the -18V supply to a bad transistor in the differential pair use to compare the voltage to the reference. With it replaced worked fine. -3V problem was their was too much leakage so the final transistor was turning on when the regulator had it off. I swapped the transistor I though was causing it without improving it. Added a resistor to bleed off the leakage into the base and that fixed the regulator. Did some reading up later on germanium transistor leakage and likely misidentified the transistor causing the problem. Next time we have supply out we will check the other transistor and replace if it is the cause.
Load tested all output and check ripple under load to verify reasonable and symmetric at 120 Hz showing all rectifiers were good. One was a little asymmetric but decided wasn't that bad so didn't try to replace it. When we finished it was too late to install. They put it in later and it looked good. End of January is next workshop to do further work on LINC and 8/I. The bearings in the LINCtapes were replaced previously but sealed bearings were used. The drag was too much so couldn't get the drives adjusted according to the manual. We will replace with shielded and hopefully can then adjust then run diagnostics to see what more needs fixing.