Thanks for playing!
There is tons of bugs in this game. But don't think this is a bug. It's a memory problem.
I tried it with 040 and no Cycle exact. Same happens for me everytime if i only have 2 MB chip RAM and no fast RAM. So try add some fast RAM! Fast RAM also speeds up the game a bit.
I found out that the game interrupts and quits to Workbench when the screen goes black. But you don't see it because of the system-configuration file in devs folder. Anyway, there is a message saying "out of memory".