用VHDL语言编写的自动售货机程序，下载到EDA实验板上可实现基本的买货售货找零显示总钱等功能。-VHDL prepared by the vending machine procedures, Experimental downloaded to EDA board can achieve basic placing orders showed total sales through irregular money functions.

自动售货机：1、通过开关选择购买6角或8角的邮票；2、按下购买键，开始购买；3、按相应键，输入1角、5角、1元硬币；4、当输入硬币总值大于等于欲买邮票价值时，相应邮票输出并找零（邮票输出，找零均用LED灯表示，找零也有1角、5角、1元三种）5、若想终止交易，可按退钱键，退出已输硬币，交易结束。-Vending machines: one, through the switch to choose to buy six cents or 8 corner stamps 2, press the