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mister_rf

Un alt proiect simplu cu PIC 12F629: "AT-to-XT-Keyboard-Converter"

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Am achizitionat o clona de calculator IBM-XT si am  avut nevoie si de o tastatura  “XT” cu 83 taste.
La aceste tastaturi, ce se ataseaza la sistem prin intermediul unui conector DIN cu 5 contacte, protocolul de comunicatie  este  total diferit fata de variantele   actuale, 101/104 key, ce dispun de un conector mini-DIN cu 6 contacte, introdus prima oara de IBM PS/2. Am fost tentat ca sa improvizez un circuit de conversie, de la protocolul AT la XT, si am fost placut surprins sa constat ca problema a fost solutionata deja de un grup de amatori, aici:
http://www.vcfed.org/forum/showthread.php?15907-AT-to-XT-Keyboard-Converter
Schema este simpla, un  PIC 12F629, cateva rezistente, un condensator si un LED pentru vizualizarea conexiunii.
Prototipul se poate realiza repede pe o placa de test.
Probabil ca proiectul va avea in viitor  si o versiune de cablaj dedicata, asa ca am schitat o varianta de cablaj.:)

ATtoXTconv.jpg

k8.jpg

k8b.jpg

k3.jpg

k4.jpg

k2.jpg

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