INT              Interrupt                           Flags: O D I T S Z A P C
0 0
INT interrupt-num

Logic:    PUSHF                  ; Push flags onto stack
TF   0                 ; Clear Trap Flag
IF   0                 ; Disable Interrupts
CALL FAR (INT*4)       ; Call the interrupt handler

INT pushes the flags register, clears the Trap and Interrupt-enable
Flags, pushes CS and IP, then transfers control to the interrupt
handler specified by the interrupt-num.  If the interrupt handler
returns using an IRET instruction, the original flags are restored.

Operands                  Clocks   Transfers  Bytes   Example
immed8 (type = 3)           52         5        1     INT 3
immed8 (type <> 3)          51         5        2     INT 21

Notes:         The flags are stored in the same format as that used
by the PUSHF instruction.

The address of the interrupt vector is determined by
multiplying the interrupt-num by 4. The first word
at the resulting address is loaded into IP, and the
second word into CS.

All interrupt-nums except type 3 generate a two-byte
opcode; type 3 generates a one-byte instruction
called the Breakpoint interrupt.

See also: IRET
See also: INTO
See also: PUSHF
See also: CALL
See also: PUSHF
See also: INT 03h
See also: Flags

INT Interrupt