Here are some examples of the allowed addressing modes:

	xor	cx, [59507]	 ; Direct mode (XOR CX with word at DS:E873)
	push	word [bx]	 ; Register-indirect mode (Push word at DS:BX onto stack)
	mov	ax, [bp-4]	 ; Base mode (Move word at SS:(BP-4) into AX)
	sub	[si+2], bx	 ; Indexed mode (Subtract BX from word at DS:(SI+2))
	not	byte [bp+di]	 ; Base-indexed mode (Invert bits of byte at SS:(BP+DI))
	add	[bx+si+2], dx	 ; Base-indexed mode with dispacement (Add DX to word at DS:(BX+SI+2))
The five addressing modes available are outlined more precisely for your reference below:
  Direct Mode: [constant]
    constant: 16-bit unsigned value

  Register-Indirect Mode: [register]
    register: bx, si, or di
    Note: bp technically isn't allowed. If used, assembler will generate [bp+0] instead.

  Base Mode: [constant + baseReg]
    constant: 8-bit or 16-bit signed value
    baseReg: bp or bx

  Indexed Mode: [constant + indexReg]
    constant: 8-bit or 16-bit signed value
    indexReg: si or di

  Base-Indexed Mode: [baseReg + indexReg]
    baseReg: bp or bx
    indexReg: si or di

  Base-Indexed Mode with Displacement: [constant + baseReg + indexReg]
    constant: 8-bit or 16-bit signed value
    baseReg: bp or bx
    indexReg: si or di