利用8255可编程并行口做一个扫描键盘实验，把按键输入的键码，显示在由8279控制的七段数码管上。8255PA口做键盘输入线，PB口作扫描线-8255 programmable parallel port using a scanning keyboard to do the experiment, the button input keys code, displayed in the control of the team respectively by 8279 digital tube. 8255PA I make the keyboard input line, PB mouth for scan line
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001004s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.065577s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000960s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000952s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003234s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000874s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014153s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001444s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 120360 [ RunTime:0.012181s ]
