toupper.asm

来自「dos下的网卡驱动程序。支持一般通用网卡」· 汇编 代码 · 共 13 行

;put into the public domain by Russell Nelson, [e-mail]

	public	to_upper
to_upper:
	cmp	al,'a'
	jb	to_upper_1
	cmp	al,'z'
	ja	to_upper_1
	sub	al,20h
to_upper_1:
	ret