Yin aiki tare da tsofaffin kwamfutoci galibi yana da wahala saboda ba su dace da kayan aikin zamani ba. Idan kun lura cewa farashin tsohon CRT (cathode ray tube) TV da masu saka idanu sun yi tashin gwauron zabi kwanan nan, zaku iya gode wa al'ummar wasan kwamfyuta na retro da retro. Ba wai kawai zane-zane masu ƙarancin ƙima sun fi kyau akan CRTs ba, amma yawancin tsofaffin tsarin kawai ba za su iya sake fitar da bidiyon da ke karɓuwa akan masu saka idanu na zamani ba. Magani ɗaya shine a yi amfani da adaftan don canza tsohuwar siginar RF ko haɗaɗɗen siginar bidiyo zuwa sigina mafi na zamani. Don taimakawa wajen haɓaka irin waɗannan adaftan, dmcintyre ya ƙirƙiri wannan ƙaddamarwar bidiyo don oscilloscopes.
Yayin canza bidiyo, dmcintyre ya ci karo da matsala inda guntun bidiyo na TMS9918 bai haifar da iyaka ba. Wannan ya sa kusan ba zai yiwu a bincika siginar bidiyo ba, wanda zai zama dole ga waɗanda ke ƙoƙarin canza su. The Texas Instruments TMS9918 VDC (Video Display Controller) jerin kwakwalwan kwamfuta sun shahara sosai kuma ana amfani da su a cikin tsofaffin tsarin kamar ColecoVision, kwamfutocin MSX, Texas Instruments TI-99/4, da dai sauransu. . Haɗin USB yana ba ku damar ɗaukar nau'ikan igiyoyi da sauri akan oscilloscopes da yawa, gami da dmcintyre's Hantek oscilloscopes.
Da'irar faɗakarwar bidiyo galibi tana da hankali kuma tana buƙatar ƴan haɗe-haɗe kawai: Microchip ATmega328P microcontroller, 74HC109 flip-flop, da LM1881 mai raba bidiyo tare. Ana siyar da duk abubuwan haɗin gwiwa zuwa daidaitaccen allo na burodi. Da zarar an aika lambar dmcintyre zuwa ATmega328P, yana da sauƙin amfani. Haɗa kebul daga tsarin zuwa shigar da Bidiyon Trigger da kebul daga fitowar Fitar Bidiyo zuwa na'ura mai jituwa. Sannan haɗa kebul na USB zuwa shigar da oscilloscope. Saita iyaka don kunnawa a gefen madaidaici tare da madaidaicin kusan 0.5V.
Tare da wannan saitin, yanzu zaku iya ganin siginar bidiyo akan oscilloscope. Danna maɓallin juyi akan na'urar kunna bidiyo tana jujjuyawa tsakanin tashi da faɗuwar siginar faɗaɗa. Juya encoder don matsar da layin faɗakarwa, latsa ka riƙe mai rikodin don sake saita layin jawo zuwa sifili.
A zahiri baya yin kowane juyi na bidiyo, yana bawa mai amfani damar tantance siginar bidiyo da ke fitowa daga guntuwar TMS9918. Amma binciken ya kamata ya taimaka wa mutane su haɓaka masu sauya bidiyo masu jituwa don haɗa tsofaffin kwamfutoci zuwa masu saka idanu na zamani.
Lokacin aikawa: Nuwamba-17-2022