La shaqaynta kombiyuutarada da'da ah inta badan way adag tahay sababtoo ah maaha kuwo ku habboon qalabka casriga ah. Haddii aad dareentay in qiimaha TV-yadii hore ee CRT (cathode ray tube) iyo kormeerayaashu ay cirka isku shareereen dhawaan, waxaad u mahadcelin kartaa ciyaaraha retro iyo bulshada kombayuutarka retro. Ma aha oo kaliya in garaafyada xallinta hooseeya ay si fiican uga muuqdaan CRT-yada, laakiin nidaamyo badan oo da' weyni si fudud uma soo saari karaan muuqaal la aqbali karo kormeerayaasha casriga ah. Mid ka mid ah xalku waa in la isticmaalo adabtarada si loogu beddelo RF-gii hore ama calaamada fiidiyooga ee isku dhafan ee signalada casriga ah. Si ay gacan uga geysato horumarinta adapters-ka noocan oo kale ah, dmcintyre waxay u samaysay fiidyowgan soo-bandhigidda oscilloscopes.
Intii lagu guda jiray beddelka fiidiyowga, dmcintyre waxay la kulantay arrin meesha TMS9918 chip-ga fiidiyaha uusan u kicin baaxadda si la isku halleyn karo. Tani waxay ka dhigaysaa mid aan macquul ahayn in la falanqeeyo calaamadaha muuqaalka, taas oo lagama maarmaan u ah kuwa isku dayaya inay beddelaan. Qalabka Texas Instruments TMS9918 VDC (Video Display Controller) ee taxanaha ah waa kuwo aad loo jecel yahay waxaana loo adeegsadaa nidaamyada da'da ah sida ColecoVision, kombiyuutarada MSX, Texas Instruments TI-99/4, iwm . Isku xirka USB wuxuu kuu oggolaanayaa inaad si dhakhso leh ugu qabato mowjadaha mowjadaha oscilloscopes badan, oo ay ku jiraan dmcintyre's Hantek oscilloscopes.
Wareegga kicinta fiidiyaha inta badan waa kala go'an wuxuuna u baahan yahay oo keliya dhowr wareegyo isku dhafan: Microchip ATmega328P microcontroller, 74HC109 flip-flop, iyo LM1881 fiidiyoow iskuxiran. Dhammaan qaybaha waxa lagu iibiyaa roodhida caadiga ah. Marka koodka dmcintyre loo gudbiyo ATmega328P, aad bay u fududahay in la isticmaalo. Ku xidh fiilada nidaamka ilaa gelinta Fiidiyowga Kiciya iyo fiilada ka soo-saarka Fiidiyowga iyo kormeeraha ku habboon. Kadibna ku xidh fiilada USB gelinta oscilloscope-ka. Deji baaxadda si aad u kiciso cidhifka daba-socda oo leh xaddi gaadhaya 0.5V.
Habayntan, waxaad hadda ku arki kartaa calaamada muuqaalka oscilloscope-ka. Ku dhejinta cod-bixiyaha rotary ee aaladda fiidyaha ee kiciya ayaa u dhexaysa kor u kaca iyo cidhifka soo dhacaya ee calaamada kiciya. U rog furaha si aad u dhaqaajiso xariiqda kiciya, taabo oo qabo codeeyaha si aad xariiqda kiciya ugu celiso ebe eber.
Dhab ahaantii ma samaynayso beddelka fiidiyooga, kaliya waxay u ogolaataa isticmaaluhu inuu falanqeeyo calaamada fiidiyowga ee ka imanaya chip TMS9918. Laakiin falanqayntu waa inay dadka ka caawisaa inay horumariyaan beddelayaasha fiidiyooga ee ku habboon si ay ugu xidhaan kombuyuutarrada hore ilaa kormeerayaasha casriga ah.
Waqtiga boostada: Nov-17-2022