I picked up a Honeywell manual several years ago, it's titled "Fokker 100 Flight Management System Pilot's Guide", directly from Honeywell.
In the US, their phone number is 602.436.2313 , or try 602.436.1446.
If you have a F70/F100 AOM, the section titled "Flight Management Systems" is pretty much a reprint of the Honeywell manual.