Impressive

My first though for that amount of blackening in the corner of the case would be indicative of someone plugging in a C8 mains flex maybe 😅

Man this is cool

I need to get an oscilloscope and fix my father's Радио-86РК that he built himself from the scratch. Keyboard was made with buttons from desk calculators if I recall correctly) He with his friend built several of those at work and one of them had a peculiar fault: EPROM would not work until a lightbulb was placed on top of the erase window.

Like !!!

@Brfff this one

Cool, I was reading Radio magazine at the time and skipping over those pages because the schematic and the number of ICs were way over my head and my ability to obtain them.

Hold on! Remaking the old keyboard without improving it is the easy way, now get the Euro sign on it and an improved way of typing in the diacritic characters or cyrilic. On old computers often it is a lot of work to do that. And I must say that there is nothing wrong with moving the keys around till they end up on the keyboard where nowadays the keys are situated, like the Esc key is now on the same row as the function keys, in the old days it was besides the 1-key. In the early days making the keyboard was the most expensive part of the computer if only back then all manufacturers used the same ley-out, then costs could have been reduced. Back then every switch costed real money and good switches even more then that. The improvement on the ROM board is nice.

What colour LEDs are you going to use on the keyboard? 🤔😅

Very nice keyboard pcb, I am looking forward to see PP-01 clicking with cherry flavour :-). Just maybe it would be nice to keep original keyboard pcb alive and not harvest parts from it, from history preservation point of view. Used circuits are not very special and irreplaceable. I will consider to build such keyboard for myself, telephone dialling buttons are not the best keyboard option indeed.

new boards look smick!... cant wait to see this thing up n running!

Lots and lots of toys! Very cool!

You're welcome, Brett. If any more keyboards need this kind of conversion, just ask.

Pretty neat right there. I've got to catch up on my Clueless engineer video backlog again!

All my childhood I dreamed about this PC cause it was the most famous home brew PC in USSR. It was a virtual Raspberry Pi of its time but.....if you wanted to make some then you had to commit a crime of stealing very rare MCs from the military oriented factories. That is why commoners had only БК, ПОИСК (this one was for cool kids with parents in the Party HQ), Вектор and later on we had all kinds of ZX Spectrum clones. By commoners I mean families with the elite jobs like plane pilots, high ranked scientists, ruling system members and crime lords of the era. You could easily swap any PC for a motorcycle or two PCs for a ВАЗ 2101 car in late 1980 - early 1990. Real Western IBM PC desktop machine could be a reason why your apartment has the same security as the police armory and why you could be stabbed and looted at the streets if you had 5inch floppies (not because bandits had PCs but because floppies were a part of the USSR's cargo cult.). Радио-86РК disappeared from the market in 1991...... Complete HP 486 DX2 66Mhz (VGA 15'' monitor, 32RAM, 1Mb VESA Video, 200+mb HDD, no CD ROM, no Sound card, no modem) in 1994 was exactly 2440real money and no sales for local money were possible cause it would be too much paper weight. Cheapest 386SX 200 based system with 2MB of ram and 40Mb HDD was 1200 Compaq 80286 based system with 1.2Mb of ram and 20mb hdd was no less than 800 ZX clone of the same era was around 200 real money with a color monitor while motorcycle was around 30. In 1995 Pentuim appeared and all the Post USSR computer market gone mad. Everyone started to ditch everything older than 486. Prices were cut in half but still too expensive for students. The same year green capacitors looting became a thing. Science workers demolished old ДВК and Поиск based educational classes, mainframes, science equipment and TV station hardware in order to buy at least one 386. ZX 48 clones market flopped. ZX Scorpion based marked lived for three more years. By 1998 there were little to none old era USSR made mainframes and classes. I remember when punch cards were EVERYWHERE at the streets of my city cause software warehouses went to a dumpster and looting. ZX and БК base game clubs went down last. it was way cheaper to use Nintendo systems ripoffs as a gaming clubs hardware.

Congrats on reaching 2 kilobytes worth of subscribers, Brett :) It's always interesting to see your impressions of all sorts of weird unpopular/non-default computers.

These "Lvivs" were kind of a masterpiece of an 8080 hw design, but just a total nightmare to run. I had 6 or 7 of them die on me out of 10, in several weeks time. One time they just wouldn't turn on - gone. believe me or not - but I managed to diagnose/repair like 4 of them with a... nail (!!) I was shorting out IC pins and watching if that changed anything in display, and if it did not - I did cut that IC out, soldered in a new one and we were up again. Fun times :)

Well, those "space invaders" caps might be part of the problem. They grew stalactites and shorted out with time. Possibly the worst caps of all times, should be avoided in every possible case.

There is no poblem with your Alpha-BK, it only displays everything in russian and otherwise misbehaving, because you have no keyboard connected. The keyboard pulls up 8 data lines of the PPA, and the pc starts working. You should connect a keyboard (or at least a pull-up network) and switch to latin layout, as simple as that.

4:56 making copies you could use a dual tape deck :)

Nice find! Totally unrelated: What was the name of that spider that was hanging around?

I have to get the caps changed in my Vic 20, they are not fat but I would feel easier if they were changed out, I changed out the ones on the boards of my Research Machines 380Z, the very machine from my school that I learned to program on. Are there any modems that can be modded to work with the Vic 20? I have quite a few 56K modems lying around.

nice and simple motor driver board... it really shouldnt be too hard to send stuff to it with a little fiddling!... ....this made me wonder what hardware was used on the old vic20 and commodore64s that were used to control the Slotcar tracks (them big 8 lane things)...i wonder if youve seen any on your travels?!

2K already! damn you! :P congrats mate.... ...dunno why but this one didnt pop up for me until today.... youtubes been really weird lately...

There's probably some old Ham who has this software.

cant find Part 2

Heh I remember reading the series in the original magazine. Also the competing design Specialist/Специалист in another magazine around 1987, which I was subscribed to then. The latter turned even more obscure.

I can't see any misbehavior. So where is it misbehaving exactly? Although 61C for a 8080 seems way too high to me. It means it's impossible to hold a finger on it, and I never met an 8080 so hot.

I wouldn't pay too much attention to dislikes, especially if it's only a very small fraction of your views.

There is something with the combination of older ICs and turned pin sockets that sometimes make whatever computer or other device non-functional. Sometimes, the pins can work themselves out of the sockets. @Epictronics discovered this recently while working on a C64. Because of his discovery, he had to replace the turned-pin socket with a dual wipe one. He does a very good explanation as to why in his latest video.

Why not use a 28C16 as an alternative to the 27C16? Nice to see it working!

Thanks for the shout out! Even if it's not running on the day, it'll be good to have a 664 on display to complete the set!

mnoo

Methinks you have a troll disliking your videos, Brett. Trolls need to stay under their bridges and leave everyone alone! lol

Congrats on busting the 2k mark! And hell yeah, 6 minutes is a long time when you are an old fart like me!

If I start watching a video, I'll always watch to the end. I don't think that is typical though, drop off curve looks familiar, I think short attention span is quite common. I like the range of east block computers I've not seen before. Miss the stomping upstairs though.

Cheers for your videos, always like seeing the wide variety of computers and your efforts in trying to resurrect them. Much appreciated.

@16:24 Pin 13 on that TC74HCU04P looks knackered.

What about the MC6845P? Nice seeing a clock signal without any extra baggage. :)

If the Z80 is getting a clock, the only thing that would stop it outputing DRAM refresh on A0-A7 would be BUSACK low, as this would mean the Z80 frees the buses for external use. So A0-A7 should be active if BUSACK is high. And the gate array won't do anything until the BIOS tells it to.

just a heads up....40007 and 40010 pinouts are different! ..you might want to grab the correct pinout for probing!! :P id start with the diag expansion will bypass the rom and ram... will let you know if the z80 and GA are good no screen at all suggests CRTC isnt sending H/Vsync to GA...GA is bad, or Z80 is bad... once you can get something on screen you can test ram/multiplexers/buffers... the clock into the z80 should be 4mhz (pin 6 on the z80)... you seem to be probing the clock for the sound which is only 1mhz... NPHI is the Z80 clock on the 40010 (pin 19 on the GA).... NCPU (pin 14) is the 1mhz sound and memory clock

1K2 - 1.2 kilo Ohm. R\K\M\G between numbers is the decimal point that shows the preceding number multiplier K at the end is the precision marker. in this case resistance is plus-minus 0.5%

Interesting video, thanks! Can You help me tl send me some .wav programs for X07?

My Amiga 1000 I bought used in probably 1986 had a SCART cable. Only one I've ever seen in real life I think.

I ended up sourcing NiCd batteries for mine. They were solder tab cells, so I made up my own packs. I don't have paper to test the printer yet, but the HHC itself seems happy enough. Of course I did end up doing it all three times. Learned a few lessons along the way. Lesson 1, if you don't have the HHC's fuse locked down properly with its original sleeve, you are going to short against the back panel and smoke all the positive leads. Ask me how I know this. And yes, it all survived. In the final config I shrink wrapping the fuse assembly on both the HCC and the printer. Thanks for the videos and advice!

love them bypass caps..but makes its a bit hard to read the part numbers!

fun for the whole family! :P

SOOOOOOO many platinum capacitors..... Missing components appear to be KT315 transistors. You can replace those with any N-P-N signal transistors with amplification 400-1000. (BC547, 2N2222)

DD44 dostovei? :p