Interrupt Vectors - Zenith Z-100 Reference Manual

Interrupt Vectors

The interrupt vectors recognized by the microprocessor in your computer allow
the different devices on the I/O bus to halt CPU operation when an operation
related to the device requires service.
Table 2.8 lists the interrupt vectors which may occur as the result of various
assembly level programming operations.
Table 2.8. Program Interrupt Vectors
VECTOR
Table 2.9 lists the interrupts recognized by the Intel 8259 Programmable Interrupt
Controller.
Table 2.9. 8259 Programmable Controller Interrupts
VECTOR FUNC T ION
Time-of-day
8 9
Keyboard
Reserved for Z-319 card
A B C
Communications (COMI)
Communications (COM2)
D Winchester disk drive
Floppy disk drive
Parallel printer interrupt
FUNCTION
Divide by 0
Single Step
Non-Maskable Interrupt
Breakpoint
Overflow
Print Screen
Not used
Not used
System Operating Features
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