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?
