First post, by darry
Sorry if this is not the most appropriate forum, but it felt like the best place for this, since the PC is newer than the affected game .
I have a "retro" PC (Pentium 3) on which I use a mechanical USB keyboard . This usually works fine in DOS thanks to the BIOS routines for legacy keyboard emulation .
Doom, Duke Nukem 3D and others work fine under DOS too. BUT, when I tried Jazz Jackrabbit, I realized that any time a key is pressed, the animation starts to stutter . I plugged in a spare PS/2 keyboard (did not even bother unplugging the USB one), tried using it instead of the USB one and everything worked fine .
Moral of the story : PS/2 keyboard emulating BIOS code is not always perfect and having an actual PS/2 keyboard is better .