CALL - Call Instruction

The CALL instruction is used to pass control to a sub routine. The memory address of the destination is supplied in the operand.
This command has 2 parts, Instruction, then either a Register, Immediate value, Label, Routine Name or a memory address.

Examples show how to call a sub routine at:
000007D4 SubPressAnyKey:

Assembly
Sample Description 16 bit Machine
Code

CALL 0x07D4 ; Call using an immediate memory
; address E8 D4 07

CALL SubPressAnyKey ; Call using a routine name or label E8 A2 06

MOV BX, 0x0020 ; Assign a memory location BB 20 00

MOV [BX], 0x07D4 ; Assign a valid sub routine address C7 07 D4 07

CALL [BX] ; Call using a direct memory address FF 17

Assembly Sample	Description	16 bit Machine Code
CALL 0x07D4	; Call using an immediate memory ; address	E8 D4 07
CALL SubPressAnyKey	; Call using a routine name or label	E8 A2 06
MOV BX, 0x0020	; Assign a memory location	BB 20 00
MOV [BX], 0x07D4	; Assign a valid sub routine address	C7 07 D4 07
CALL [BX]	; Call using a direct memory address	FF 17