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 Int 08h                 System Timer
 Int 09h                 Keyboard
 Int 10h                 Video and Screen Services
 Int 11h                 Read Equipment-List
 Int 12h                 Report Memory Size
 Int 13h                 Disk I/O Services, Floppy and Hard Disks
 Int 14h                 Serial I/O Services (Communications Ports)
 Int 15h                 Cassette and Extended Services
 Int 16h                 Keyboard I/O Services
 Int 17h                 Printer I/O Services
 Int 18h                 BASIC Loader Service
 Int 19h                 Bootstrap Loader Service
 Int 1Ah                 System Timer and Clock Services
 Int 1Bh                 Keyboard Break
 Int 1Ch                 User Timer Tick
 Int 4Ah                 User Alarm
 Int 70h                 Real-Time Clock