INT &40 0000:0100 OSFIND F000:1DAC
INT &41 0000:0104 OSGBPB F000:1DCF
INT &42 0000:0108 OSBPUT F000:1F1F
INT &43 0000:010C OSBGET F000:1F3B
INT &44 0000:0110 OSARGS F000:1F4F
INT &45 0000:0114 OSFILE F000:1F93
INT &46 0000:0118 OSRDCH F000:19B0
INT &47 0000:011C OSASCI F000:19D8
INT &48 0000:0120 OSNEWL F000:19DD
INT &49 0000:0124 OSWRCH F000:19E5
INT &4A 0000:0128 OSWORD F000:1E6D
INT &4B 0000:012C OSBYTE F000:1E10
INT &4C 0000:0120 OSCLI  F000:1A11
INT &4D 0000:0134 unused 0000:0000
INT &4E 0000:0138 unused 0000:0000
INT &4F 0000:013C ERROR  F000:2048

        0000:05F0 Escape flag
        0000:05F4 Error pointer
        0000:05F8 Error handler
        0000:05FC