I just got two old Olivetti PS/2 keyboards:

Olivetti ANK 27-102 N
Olivetti ANK 27-102

The problem with both of these, that when entering numbers, wrong characters are sent to the computer. The problem appears in DOS and Windows.

The guy who I got them from, told that the clock speed of the keyboards could be too slow.

If someone here has knowledge about how to fix this problem, please let me know! I don't know if it is possible to do anything, or should there just be a slower computer like 286 CPU for it to work correctly.