https://pauljmac.com/projects/index.php?action=history&feed=atom&title=Jeopardy_PIC_buzzer 2026-04-21T14:06:30Z Revision history for this page on the wiki MediaWiki 1.42.3 https://pauljmac.com/projects/index.php?title=Jeopardy_PIC_buzzer&diff=5&oldid=prev 2024-12-08T16:06:15Z

<p>Created page with &quot;== Assembly Code == &lt;pre&gt; ; Header --------- list p=16f84a __config h&#039;3ff1&#039; radix hex ; equates -------- portb equ 0x06 ;inputs porta equ 0x05 ;outputs status equ 0x03 ; Program -------- org 0x00 start movlw 0xff tris portb ;port b as inputs movlw 0x00 tris porta ;port a as outputs loop movlw 0xff movwf portb btfsc portb,6 ;probe portb 6 to see if its down goto loop goto poll poll movlw 0x07 movwf porta probe btfss portb,0 ;poll player 1 goto player1 btfs...&quot;</p> <p><b>New page</b></p><div>== Assembly Code ==<br /> &lt;pre&gt;<br /> ; Header ---------<br /> list p=16f84a<br /> __config h&#039;3ff1&#039;<br /> radix hex<br /> ; equates --------<br /> portb equ 0x06 ;inputs<br /> porta equ 0x05 ;outputs<br /> status equ 0x03<br /> <br /> ; Program --------<br /> org 0x00<br /> start movlw 0xff<br /> tris portb ;port b as inputs<br /> movlw 0x00<br /> tris porta ;port a as outputs<br /> loop movlw 0xff <br /> movwf portb<br /> btfsc portb,6 ;probe portb 6 to see if its down<br /> goto loop<br /> goto poll<br /> poll movlw 0x07<br /> movwf porta<br /> probe btfss portb,0 ;poll player 1<br /> goto player1<br /> btfss portb,1 ;poll player 2<br /> goto player2<br /> btfss portb,2 ;poll player 3<br /> goto player3<br /> btfss portb,3 ;poll player 4<br /> goto player4<br /> btfss portb,4 ;poll player 5<br /> goto player5<br /> btfss portb,5 ;poll player 6<br /> goto player6<br /> goto probe<br /> player1 movlw 0x01<br /> movwf porta<br /> return<br /> player2 movlw 0x02<br /> movwf porta<br /> return<br /> player3 movlw 0x03<br /> movwf porta<br /> goto loop<br /> player4 movlw 0x04<br /> movwf porta<br /> return<br /> player5 movlw 0x05<br /> movwf porta<br /> return<br /> player6 movlw 0x06<br /> movwf porta<br /> return<br /> end<br /> &lt;/pre&gt;<br /> <br /> == Notes ==<br /> Pretty code, yes I realize this. This was my first attempt at using a PIC to actually do something useful. Each contestant got their own input line on the PIC for a total of 6 contestants. An input line was used as a reset button to reset the game. The outputs drove BCD chips to display which contestant buzzed in first.</div>

Paul