Part Number	Description
8066820	SOFTWARE UPGRADE KIT MK6.XE4 (BASIC) HEDS / SPDS
8066840	SOFTWARE UPGRADE DISK MK6.xE4 (BA) FO35/5x/HEDS
8066930	SOFTWARE UPGRADE DISKS MK6.xE4 (QCRi) FO35/55
8517560	64A UPGRADE KIT FOR MODULAR FO5X/FO4X