8086 16-bit helloworld in GNU assembly

hello.asm

# as --32 hello.s -o hello.o
# ld -melf_i386 -Ttext=0x100 --oformat=binary hello.o -o hello.com

.code16
.globl _start
.section .text

_start:
	# print question
	movw	$ask, %dx
	movb	$0x09, %ah
	int	$0x21

	# input string
	movw	$name, %dx
	movb	$0x0a, %ah
	int	$0x21

	# append '$' to the end of user string
	movw	$name + 2, %bx
	addb	(nmlen), %bl
	movb	$'$', (%bx)

	# put ", " between 'Hello' and user input
	movw	$0x202c, %ax
	movw	%ax, (name)

	# print 'Hello, %user-input'
	movw	$msg, %dx
	movb	$0x09, %ah
	int	$0x21

	ret

ask:	.ascii "What is your name? $"
msg:	.ascii "\nHello"
name:	.byte 0xff # allow up to 255 symbols
nmlen:	.byte    0 # input string length