"KESYS" is a global short-term for all KE-programs:
  HEX-WORK85, KEMM88..93, KXMM92..95, KESYS97..99, KESYS001..010
 "KESYS" also stands for an alternate programming philosophy, 
  and is not related to any company which may have registered
 "KESYS" for a company's name or brand.

 Re-engineering of existing code may sound like a criminal act,
 but if you lost the source of your ROM-program or cannot get
 all required information for a modification from your vendor,
 then we may be able to help by analyse and modify as desired: 

 ROM/EPROM-,USB- or DISK-stored code based on almost any CPU:
 Z-80,Z-280,NSC800,M6800+,M68000+,6502+,1802/04,HC11+,x86,...
 (x86-64, Infineon and ARM on request only yet)

 But please don't ask for modification on Windows or Linux code!