FF INT FF - AT/XT286/PS50+ - destroyed by return from protected mode
FF INT FF - Z100 - WARM BOOT
FF INT FF - Sanyo MBC-550/555 - IRQ7 - USER INTERRUPT FOR EXTERNAL INTERRUPT
FF INT FF U - QEMM-386.SYS v6.0+ - internal
FF INT FF - VIRUS - "Violetta" - ???
FF----BX0000 INT FF - PC/FORTH - GRAPHICS API - VIDEO STATUS CHANGE
FF INT FF - PC/FORTH - GRAPHICS API