INT 00h (0)             Divide by 0 
 INT 01h (1)             Single Step 
 INT 02h (2)             Non-Maskable Interrupt (NMI) 
 INT 03h (3)             Breakpoint 
 INT 04h (4)             Overflow 
 INT 05h (5)             Print Screen 
 INT 08h (8)             System Timer 
 INT 09h (9)             Keyboard 
 INT 10h (16)            Video and Screen Services 
 INT 11h (17)            Read Equipment-List 
 INT 12h (18)            Report Memory Size 
 INT 13h (19)            Disk I/O Services, Floppy and Hard Disks 
 INT 14h (20)            Serial I/O Services (Communications Ports) 
 INT 15h (21)            Cassette and Extended Services 
 INT 16h (22)            Keyboard I/O Services 
 INT 17h (23)            Printer I/O Services 
 INT 18h (24)            BASIC Loader Service 
 INT 19h (25)            Bootstrap Loader Service 
 INT 1Ah (26)            System Timer and Clock Services 
 INT 1Bh (27)            Keyboard Break 
 INT 1Ch (28)            User Timer Tick 
 INT 4Ah (74)            User Alarm 
 INT 70h (112)           Real-Time Clock