Ahhh, very interesting ... I hadn't seen that mentioned anywhere yet, thanks for the advice! I'll look at getting the baseband video signal where it enters the modulator. At least it will save me having to fiddle around making yet another RGB cable! I'm not confident it'll work (although my KC85/3 did work) ... let's see!
The Z9001 is available in 6 variants: - Z9001 84 series (RAM basic, basic module) - Z9001 85 series (RAM basic, basic module) - KC85/1.10 and KC85/1.11 (same as Z9001 85 series, just renamed) - KC87.10 and KC87.11 (Z9002, but not sold under this name, BASIC-86) - KC87.20 and KC87.21 (for retail, Plotter-BASIC) - KC87.30 and KC87.31 (only for industrial sales, Plotter-BASIC) Devices with a colour module are designated .x1, those without a colour module - the black and white versions - have a 0 at the end. With an additional colour module and a few modified bridges on the main board, a black and white device can be converted to a colour model. hc-ddr.hucki.net/wiki/doku.php/z9001/versionen
I see a lot of East German bodge wires... Which are wire-wrapped (gas-tight when done correctly!). Those little caps @12:10 in the lower left-hand corner are pretty cool. They look bow-legged. As for the power supply, I would check those large diodes on the output end. And/or disconnect the circuit somewhere in the middle to possibly see if the short is before or after that mid-point. And whatever that stuff is used for, it was painted on. Weird. And now that you mentioned it, I can't unsee it. :) As for running it without the filter, it being "current-compensated" (or whatever the wording was) could be how they limit the current into the board. So be careful.
I'll have another look, thanks. I'm going to try and boot the machine using a Mean Well PSU (no -12V) to see if it's working ... bit wary of the original PSU ... although the fuse seems to keep doing its job! I think this is the schematic here ... www.sax.de/~zander/kc/kcsch_6.pdf
@@Brfff You're welcome! :) Now that's an awesome schematic! I think that what those pictures show is the waveform when the PS is turned on. Nice! But I'm with you, the Meanwell is the way to go. Take transformer T2 for example. Looking at terminal #7 (top) on the transformer, it appears that the plate is energized. Am I reading that correctly? In the end if I managed to fix it, I wouldn't want to turn it on.
From memory, there's a Meanwell that does +5, +12 and -12. You can use a 7905 to derive the -5v from there. I've fixed quad voltage Apple II PSUs that way. (Oddly, once I posted that to the ApplpeFritter forums, expecting to be eviscerated for my arrogance, one of the big hitters on the forum did exactly the same mod and thanked me for the idea. Turns out that while ONE of the Apple II PSUs was great and worth fixing, there was one that was an absolute sh!storm and that was the one I had)
They've got a few models ... the Mean Well RQ-50B looks reasonable (about AU$40): 5V/5A -5V/0.5A 12V/1A -12V/0.5A I hooked the computer itself up to just +5V yesterday and it was drawing about 1.6A.
I actually did use the thermal camera but on the computer itself - I tried running it on just +5VDC and it was drawing about 1.6A ... yikes! Maybe this is normal but it's pretty high compared to other machines I've fiddled with. So had a look at nothing was exceedingly hot. But didn't try the PSU ... it seems to blow very quickly. Going to have another look at it today.
This computer is definitely from East Germany, made by VEB Robotron in Dresden. But then there's not just Soviet, there seems to be parts sourced from all over the Eastern Bloc and USSR in this device, including three ICs from West Germany.
Of the two DDR machines I've got, they're both pretty solidly built. Unfortunately it seems that the only East German product most of us in the West are aware of is the Trabant ... but I've got a Practika camera (was my dad's) and now two KCs and I have to admit that they are all solidly built ... I'm still using the Practika with it's built-in exposure meter ... although I can picture some Trabant factory style QC measures being used for the KCs 🫣 th-cam.com/video/mIAYxWCXF8A/w-d-xo.html
Oh no, no , NEVER say "EAST-Germany" or such nonsense. Please accept, it was the GdR (German Democratic Republic) nothing else. When You say "DRR , bla.bla" thats kind of respectless, at least the way you. Respect my country my poeple, our work. PERIOD. Historicaly correct (German Recich of 1902, no NAZI Reich) it would be in the middle, have Ost-Tpreussen, Schelsien, Königsberg in mind. Thanks
Mate, we've had this discussion. In English speaking countries, the GDR was commonly referred to as "East Germany" ... just as West Germany was called "West Germany" and not FRG. Example - 1989 British Army video on travelling to West Berlin through "East Germany"! th-cam.com/video/YUJ7GbxWGoM/w-d-xo.html I'm not saying it just to trigger you in particular, it's just a matter of fact. Maybe in Germany and Communist bloc countries it was called GDR or DDR, but I speak English, not German, and I grew up in Australia. I'm quite disappointed that your takeaway from my videos on East German computers is disrespectful ... I thought I was quite positive about their build quality.
![🇺🇦 УМПК-Р (UMPK-R): Part 1 (First Look) [TCE #0544]](http://i.ytimg.com/vi/Kr2Yl7z__qQ/mqdefault.jpg)
![🇺🇦 УМПК-Р (UMPK-R): Part 1 (First Look) [TCE #0544]](/img/tr.png)
![F.HERO Ft. JSPKK x ลำไย ไหทองคำ x M-PEE - ไม่สนิทบิดหมด (Thai Riders Anthem) [Official MV]](http://i.ytimg.com/vi/kPJZ0UihBfk/mqdefault.jpg)
![fellow fellow - พรุ่งนี้ไม่มีใครรู้ feat. INK WARUNTORN [OFFICIAL MV]](http://i.ytimg.com/vi/QP6JyjYx_W0/mqdefault.jpg)
Unfortunately the KC87.10 you have got there is RF only and b&w only! The RGB color models are the .11, .21 and .31.
Ahhh, very interesting ... I hadn't seen that mentioned anywhere yet, thanks for the advice! I'll look at getting the baseband video signal where it enters the modulator. At least it will save me having to fiddle around making yet another RGB cable! I'm not confident it'll work (although my KC85/3 did work) ... let's see!
The Z9001 is available in 6 variants:
- Z9001 84 series (RAM basic, basic module)
- Z9001 85 series (RAM basic, basic module)
- KC85/1.10 and KC85/1.11 (same as Z9001 85 series, just renamed)
- KC87.10 and KC87.11 (Z9002, but not sold under this name, BASIC-86)
- KC87.20 and KC87.21 (for retail, Plotter-BASIC)
- KC87.30 and KC87.31 (only for industrial sales, Plotter-BASIC)
Devices with a colour module are designated .x1, those without a colour module - the black and white versions - have a 0 at the end.
With an additional colour module and a few modified bridges on the main board, a black and white device can be converted to a colour model.
hc-ddr.hucki.net/wiki/doku.php/z9001/versionen
I see a lot of East German bodge wires... Which are wire-wrapped (gas-tight when done correctly!). Those little caps @12:10 in the lower left-hand corner are pretty cool. They look bow-legged.
As for the power supply, I would check those large diodes on the output end. And/or disconnect the circuit somewhere in the middle to possibly see if the short is before or after that mid-point.
And whatever that stuff is used for, it was painted on. Weird. And now that you mentioned it, I can't unsee it. :)
As for running it without the filter, it being "current-compensated" (or whatever the wording was) could be how they limit the current into the board. So be careful.
I'll have another look, thanks. I'm going to try and boot the machine using a Mean Well PSU (no -12V) to see if it's working ... bit wary of the original PSU ... although the fuse seems to keep doing its job! I think this is the schematic here ...
www.sax.de/~zander/kc/kcsch_6.pdf
@@Brfff You're welcome! :)
Now that's an awesome schematic! I think that what those pictures show is the waveform when the PS is turned on. Nice!
But I'm with you, the Meanwell is the way to go. Take transformer T2 for example. Looking at terminal #7 (top) on the transformer, it appears that the plate is energized. Am I reading that correctly? In the end if I managed to fix it, I wouldn't want to turn it on.
From memory, there's a Meanwell that does +5, +12 and -12. You can use a 7905 to derive the -5v from there. I've fixed quad voltage Apple II PSUs that way. (Oddly, once I posted that to the ApplpeFritter forums, expecting to be eviscerated for my arrogance, one of the big hitters on the forum did exactly the same mod and thanked me for the idea. Turns out that while ONE of the Apple II PSUs was great and worth fixing, there was one that was an absolute sh!storm and that was the one I had)
They've got a few models ... the Mean Well RQ-50B looks reasonable (about AU$40):
5V/5A
-5V/0.5A
12V/1A
-12V/0.5A
I hooked the computer itself up to just +5V yesterday and it was drawing about 1.6A.
power out yesterday? ..that was a nasty storm...crazy lightning...but had no issues with the power
Isolated to our side of Ocean Drive for about an hour!
@@Brfff fun! had that happen here too..across the road and into town had no power...this side of the road was fine!...
Thermal camera would be helpfull, huh? You can try to run it with the light bulb in series an check what is getting hot.
I actually did use the thermal camera but on the computer itself - I tried running it on just +5VDC and it was drawing about 1.6A ... yikes! Maybe this is normal but it's pretty high compared to other machines I've fiddled with. So had a look at nothing was exceedingly hot. But didn't try the PSU ... it seems to blow very quickly. Going to have another look at it today.
@@Brfff in that case I'm eagerly waiting for update.
Purportedly from GDR, but assembly quality is really Soviet.
This computer is definitely from East Germany, made by VEB Robotron in Dresden. But then there's not just Soviet, there seems to be parts sourced from all over the Eastern Bloc and USSR in this device, including three ICs from West Germany.
@@michaelturner4457 I mean just assembly quality. Even Yugoslavian were better.
Of the two DDR machines I've got, they're both pretty solidly built. Unfortunately it seems that the only East German product most of us in the West are aware of is the Trabant ... but I've got a Practika camera (was my dad's) and now two KCs and I have to admit that they are all solidly built ... I'm still using the Practika with it's built-in exposure meter ... although I can picture some Trabant factory style QC measures being used for the KCs 🫣
th-cam.com/video/mIAYxWCXF8A/w-d-xo.html
QWERTZ!
pierwszy!
Only counts if you also "liked" the video!
@ rats! as garfield would say
Oh no, no , NEVER say "EAST-Germany" or such nonsense.
Please accept, it was the GdR (German Democratic Republic) nothing else.
When You say "DRR , bla.bla" thats kind of respectless, at least the way you.
Respect my country my poeple, our work.
PERIOD.
Historicaly correct (German Recich of 1902, no NAZI Reich) it would be in the middle, have Ost-Tpreussen, Schelsien, Königsberg in mind.
Thanks
Mate, we've had this discussion. In English speaking countries, the GDR was commonly referred to as "East Germany" ... just as West Germany was called "West Germany" and not FRG.
Example - 1989 British Army video on travelling to West Berlin through "East Germany"!
th-cam.com/video/YUJ7GbxWGoM/w-d-xo.html
I'm not saying it just to trigger you in particular, it's just a matter of fact. Maybe in Germany and Communist bloc countries it was called GDR or DDR, but I speak English, not German, and I grew up in Australia. I'm quite disappointed that your takeaway from my videos on East German computers is disrespectful ... I thought I was quite positive about their build quality.
FRANCE 24 English channel ... "East Germany" ...
th-cam.com/video/eNMqtCjEIrE/w-d-xo.html