Iindaba

Ukusebenza kunye neekhompyuter ezindala kuhlala kunzima kuba azihambelani nehardware yanamhlanje.Ukuba uye waqaphela ukuba amaxabiso e-CRT endala (i-cathode ray tube) iiTV kunye nabahloli baye banyuka ngokukhawuleza, unokubulela umdlalo we-retro kunye noluntu lwekhompyutha ye-retro.Ayipheleli nje ekujongeni imizobo enesombululo esisezantsi ijongeka ngcono kwiiCRT, kodwa iinkqubo ezininzi ezindala azikwazi nje ukuvelisa ividiyo eyamkelekileyo kubahloli banamhlanje.Esinye isisombululo kukusebenzisa iadaptha ukuguqula iRF endala okanye isignali yevidiyo edibeneyo ibe ngumqondiso wale mihla.Ukuncedisa ekuphuhliseni ezo adapters, idmcintyre yenze esi siqalisi sevidiyo se-oscilloscopes.
Ngelixa uguqula ividiyo, i-dmcintyre idibene nengxaki apho i-chip yevidiyo ye-TMS9918 ingazange ibangele umda ngokuthembekileyo.Oku kwenza ukuba kube nzima ukuhlalutya imiqondiso yevidiyo, enokuba yimfuneko kwabo bazama ukuyiguqula.I-Texas Instruments TMS9918 VDC (I-Video Display Controller) iitshiphusi zechungechunge zithandwa kakhulu kwaye zisetyenziswa kwiinkqubo ezindala ezifana ne-ColecoVision, iikhompyutha ze-MSX, i-Texas Instruments TI-99/4, njl. .Uqhagamshelo lwe-USB likuvumela ukuba ubambe ngokukhawuleza iifom zamaza kwii-oscilloscopes ezininzi, kubandakanya i-dmcintyre's Hantek oscilloscopes.
I-video trigger circuit ininzi i-discrete kwaye idinga kuphela iisekethe ezimbalwa ezidibeneyo: i-Microchip ATmega328P microcontroller, i-74HC109 flip-flop, kunye ne-LM1881 yevidiyo yokuvumelanisa i-sync splitter.Onke amacandelo athengiswa kwibreadboard eqhelekileyo.Nje ukuba ikhowudi ye-dmcintyre ifakwe kwi-ATmega328P, kulula kakhulu ukuyisebenzisa.Qhagamshela intambo ukusuka kwisistim ukuya kwigalelo leVideo Trigger kunye nekhebula ukusuka kwisiphumo seVidiyo yeNtshukumo ukuya kwimonitha ehambelanayo.Emva koko qhagamshela intambo ye-USB kwigalelo le-oscilloscope.Cwangcisa umda wokuqalisa kumda wokulandela ngomda omalunga ne-0.5V.
Ngolu seto, ngoku unokubona umqondiso wevidiyo kwi-oscilloscope.Ukucofa i-encoder ejikelezayo kwisixhobo sokuqalisa ividiyo sitshintsha phakathi komphetho onyukayo nowayo wesiginali yesiqhushumbisi.Jika i-encoder ukuhambisa umgca wetrigger, cofa kwaye ubambe i-encoder ukuseta kwakhona umgca wesitshisi uye kwi-zero.
Ayenzi nakuphi na ukuguqulwa kwevidiyo, ivumela umsebenzisi ukuba ahlalutye umqondiso wevidiyo ovela kwi-TMS9918 chip.Kodwa uhlalutyo kufuneka luncede abantu baphuhlise abaguquli bevidiyo abahambelanayo ukudibanisa iikhompyuter ezindala kwiimonitha zanamhlanje.