[mongol]

When I was a kid, early 80s, my mom's job had bought some IBM computer. Not PCs, but some kind of large computer in a room to help with accounting / book keeping. Terminals with green text screens were attached to this computer. They had text based menus, and somewhere in this menu system, there were games. One game was a kind of horse race I remember, where digits were racing from left to right on the screen. Another was probably a lunar lander, but memory is lacking. Can someone tell from this description what kind of computer this was, and what OS it was running?

[fer]

System/34 or System/36, the game was RACE. Here you go: https://www.youtube.com/watch?v=mYRuTHz-wwk

[mongol]

Yes, that is how it looked like! Such nostalgia

[sertyu]

Unfamiliar but probably System/34 or System/36 running SSP (System Support Program) with IBM 5250 series terminals.

Unsure about the games. Here’s an early lunar lander:

https://www.cs.brandeis.edu/~storer/LunarLander/LunarLander....

Another Lunar version:

https://undefinedvalue.com/lunar-for-c-and-rust.html

System/36 guide:

https://archive.org/details/bitsavers_ibmsystem3rogrammingWi...

Possible source for games in David H. Ahl in his book 101 BASIC Computer Games.

[ThrowawayR2]

IBM System/34, System/36, or System/38 perhaps? Those are IBM's minicomputers available in that timeframe.