This is a standard electronic bell-source version of the procedure, the 8255,8253,8259 devices designed to achieve. May be worth using.

Packet : 105230335dianzizhongbiaozhunban.rar filelist
电子钟标准版_微机原理课程设计.txt

• We are an exchange download platform that only provides communication channels. The downloaded content comes from the internet. Except for download issues, please Google on your own.
• The downloaded content is provided for members to upload. If it unintentionally infringes on your copyright, please contact us.
• Please use Winrar for decompression tools
• If download fail, Try it againg or Feedback to us.
• If downloaded content did not match the introduction, Feedback to us，Confirm and will be refund.
• Before downloading, you can inquire through the uploaded person information

Nothing．