Nkhani

Kugwira ntchito ndi makompyuta akale nthawi zambiri kumakhala kovuta chifukwa sagwirizana ndi zipangizo zamakono. Ngati mwawona kuti mitengo yama TV akale a CRT (cathode ray chubu) ndi oyang'anira akwera posachedwa, mutha kuthokoza gulu lamasewera apakompyuta ndi retro. Sikuti zithunzi zotsika kwambiri zimangowoneka bwino pa CRTs, koma machitidwe ambiri akale sangathe kupanganso makanema omwe amavomerezedwa ndi oyang'anira amakono. Njira imodzi ndiyo kugwiritsa ntchito adaputala kuti musinthe RF yakale kapena siginecha yamavidiyo ophatikizika kukhala chizindikiro chamakono. Pofuna kuthandizira kupanga ma adapter ngati amenewa, dmcintyre yapanga choyambitsa vidiyoyi cha ma oscilloscopes.
Ndikusintha kanema, dmcintyre idakumana ndi vuto pomwe chip kanema wa TMS9918 sichinayambitse kukula kwake modalirika. Izi zimapangitsa kuti zikhale zosatheka kusanthula ma siginecha a kanema, zomwe zingakhale zofunikira kwa omwe akuyesera kuwatembenuza. Tchipisi ta Texas Instruments TMS9918 VDC (Video Display Controller) ndizodziwika kwambiri ndipo zimagwiritsidwa ntchito m'makina akale monga ColecoVision, makompyuta a MSX, Texas Instruments TI-99/4, ndi zina zotero. . Kulumikizana kwa USB kumakupatsani mwayi wojambula mafunde mwachangu pama oscilloscopes ambiri, kuphatikiza ma oscilloscope a dmcintyre a Hantek.
Kanema woyambitsa mavidiyo nthawi zambiri amakhala osasunthika ndipo amangofunika mabwalo ochepa ophatikizika: Microchip ATmega328P microcontroller, 74HC109 flip-flop, ndi LM1881 sync splitter. Zigawo zonse zimagulitsidwa ku boardboard yokhazikika. Khodi ya dmcintyre ikatsitsidwa ku ATmega328P, ndiyosavuta kugwiritsa ntchito. Lumikizani chingwe kuchokera padongosolo kupita ku Video Trigger input ndi chingwe kuchokera pa Video Trigger linanena bungwe ku chowunikira chogwirizana. Kenako gwirizanitsani chingwe cha USB ndikulowetsa kwa oscilloscope. Khazikitsani kuchuluka kuti muyambitse m'mphepete mwa njira yomwe ili pafupi ndi 0.5V.
Ndi kukhazikitsidwa uku, tsopano mutha kuwona chizindikiro cha kanema pa oscilloscope. Kukanikiza makina osindikizira a vidiyo pachipangizo choyambitsa vidiyo kumasintha pakati pa kukwera ndi kutsika kwa chizindikiro choyambitsa. Tembenuzirani encoder kuti musunthe mzere woyambitsa, kanikizani ndikugwirizira encoder kuti mukhazikitsenso mzere woyambitsa mpaka ziro.
Sichichita kutembenuka kwamavidiyo, zimangolola wogwiritsa ntchito kusanthula chizindikiro cha kanema chochokera ku TMS9918 chip. Koma kuwunikaku kuyenera kuthandiza anthu kupanga zosinthira makanema kuti azilumikiza makompyuta akale ndi oyang'anira amakono.