Splitting the Atom back exit forward page 25
FFB2 to FFBD Determines the kind of IRQ (true interrupt or BRK), and executes it.
FFC0 to FFC6 Executes BRK.
FFC7 to FFCA Executes non-maskable interrupt (NMI).
FFCB to FFF9 Jump tables for major operating system routines
ADDRESS JUMP(x) CODE     NORMAL VALUE
FFCB    021A    OSSHUT - normally C278
FFCE    0218    OSFIND - normally FC38
FFD1    0216    OSBPUT - normally FC7C
FFD4    0214    OSBGET - normally FBEE
FFD7    0212    OSSTAR - normally C2AC (BRK)
FFDA    0210    OSRDAR - normally C2AC  -"-
FFDD    020E    OSSAVE - normally FAE5
FFE0    020C    OSLOAD - normally F96E
FFE3    020A    OSRDCH - normally FE94
FFE6            OSECHO - normally FE94 then FE52
FFE9            OSASCI - 0D causes CR LF
FFEB            OSCRLF - causes CR LF
FFF4    0208    OSWRCH - normally FE52
FFF7            OSCLI - normally F8EF
FFFA            RESET Jump Address
FFFE            IRQ/BRK Jump Address

back exit forward