8086 Interrupt Vector Table

8086 Interrupt Vector Table

 –

 The first 1Kbyte of memory of 8086 (00000 to003FF) is set aside as a table for storing thestarting addresses of Interrupt Service Procedures(ISP).

 –

Since 4-bytes are required for storing startingaddresses of ISPs, the table can hold 256 Interruptprocedures.

 –

 The starting address of an ISP is often called the

Interrupt Vector

or

Interrupt Pointer

. Thereforethe table is referred as

Interrupt Vector Table.

 –

In this table, IP value is put in as low word of thevector & CS is put in high vector.

8086 Interrupt Vector Table