Нафаня (Nafanya) ZX Spectrum Clone: Part 1 (Power On & Troubleshooting) [TCE

I've been interested in getting one of these machines for a while due to their keyboard and БМК (Basic Matrix Crystal, like ULA). It's dated pre-Soviet Union breakup and I think was built in the Russian SFSR, although the БМК probably comes from Belarus SSR. I initially thought it didn't work ... no video output & no keyboard sound ... but it turns out the RGB video pinout in the manual differs from reality, perhaps the original owner modified it. So I did get video to work ... maybe cleaning up the wires & connections will get a better image. The keyboard is flaky as well with just one key working if I angle the keyboard "just right", hence why there was no key tap sound. The БМК (if that's what it is) is the third type I've seen for the Soviet Spectrum - it had one leg that had come away from the pad, which I re-soldered. It also has a beautiful, ceramic Z80 clone from, I believe, East Germany/DDR based on the "80A" and "MME" markings ... never seen a ceramic version before, and interesting choice for a Russian clone ... maybe the T34s were hard to get by 1991 ... ? Some info here (Russian):
афаня 00:00 ... Intro 03:00 ... Схема Подключения Компьютера (Computer Connection Diagram) 05:40 ... Кодер (Coder) box 08:00 ... Opening the computer 11:38 ... БМК leg re-soldering 14:20 ... Power input 14:55 ... Initial power on - NOK 16:30 ... Suspect RGB video wiring 17:55 ... Checking video signals on oscilloscope - OK 21:15 ... We have video! 23:00 ... Brett thinks something 24:00 ... We have slightly better video! 26:10 ... Channel thanks & outro -------------------------------- Check out my Patreon for regular blog-type updates between videos - there is a free membership tier and two paid tiers (US$2 and US$5). There is also a one-week trial for the paid tiers so if you don't think it's worth it, then cancel ... no hard feelings ... I appreciate any support, even if it's just subscribing to my YouTube channel! / thecluelessengineer -------------------------------- Music by Karl Casey @ White Bat Audio
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