Ua haujlwm nrog cov khoos phis tawj qub feem ntau nyuaj vim tias lawv tsis sib xws nrog cov khoom siv niaj hnub no. Yog tias koj tau pom tias cov nqi ntawm CRT qub (cathode ray tube) TVs thiab cov saib tau nce siab tsis ntev los no, koj tuaj yeem ua tsaug rau retro gaming thiab retro computer zej zog. Tsis tsuas yog ua cov duab daws teeb meem qis zoo dua ntawm CRTs, tab sis ntau lub tshuab qub tsuas tsis tuaj yeem tsim cov yeeb yaj kiab uas tsim nyog rau cov saib niaj hnub no. Ib qho kev daws teeb meem yog siv lub adapter los hloov cov qub RF lossis cov teeb liab sib xyaw ua ke rau cov teeb liab niaj hnub. Txhawm rau pab txhim kho cov kev hloov pauv zoo li no, dmcintyre tau tsim lub vev xaib video no rau oscilloscopes.
Thaum converting video, dmcintyre ntsib ib qho teeb meem qhov twg lub TMS9918 video nti tsis ua rau muaj kev ntseeg siab. Qhov no ua rau nws yuav luag tsis tuaj yeem txheeb xyuas cov teeb liab video, uas yuav tsim nyog rau cov neeg sim hloov lawv. Lub Texas Instruments TMS9918 VDC (Video Display Controller) series chips yog nrov heev thiab siv nyob rau hauv cov laus systems xws li ColecoVision, MSX computers, Texas Instruments TI-99/4, thiab lwm yam. Qhov no video trigger muab composite video bandwidth thiab interface USB rau oscilloscopes. . Kev sib txuas USB tso cai rau koj kom ceev nrooj ntes waveforms ntawm ntau oscilloscopes, suav nrog dmcintyre's Hantek oscilloscopes.
Lub tshuab hluav taws xob video feem ntau yog qhov tsis sib xws thiab tsuas yog yuav tsum muaj qee qhov kev sib txuas ua ke: Microchip ATmega328P microcontroller, 74HC109 flip-flop, thiab LM1881 video sync splitter. Tag nrho cov khoom yog soldered mus rau ib tug standard breadboard. Thaum tus lej dmcintyre tau xa mus rau ATmega328P, nws yooj yim heev rau siv. Txuas lub cable los ntawm lub kaw lus mus rau Video Trigger input thiab lub cable los ntawm Video Trigger tso zis mus rau lub saib tau tshaj. Tom qab ntawd txuas lub USB cable rau cov tswv yim ntawm oscilloscope. Teem lub Scope los ua rau ntawm ntug kev nrog rau qhov pib ntawm 0.5V.
Nrog rau kev teeb tsa no, tam sim no koj tuaj yeem pom cov teeb liab video ntawm oscilloscope. Nias lub teb encoder ntawm lub video trigger ntaus ntawv toggles ntawm qhov nce thiab ntog ntug ntawm lub teeb liab tshwm sim. Tig lub encoder kom txav cov kab kab, nias thiab tuav lub encoder kom rov pib dua txoj kab ua rau xoom.
Nws tsis tau ua ib qho kev hloov pauv video, nws tsuas yog tso cai rau tus neeg siv los tshuaj xyuas cov teeb liab video los ntawm TMS9918 nti. Tab sis qhov kev tsom xam yuav tsum pab tib neeg tsim cov video converters sib xws los txuas cov khoos phis tawj qub rau cov saib niaj hnub.
Lub sij hawm xa tuaj: Nov-17-2022