What have you bought recently?

PCXT

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Recently I bought a Soviet microcomputer. It has been probably made in Moscow plant, designed in 1980s, but made until 1990s, my unit is from 1991, when it was sold either as a TV game, or as some kind of hobbyists tool. The computer is 8080-based, has some amount of 8255 for I/O and a 8253 timer. 2kB ROM consists of a monitor with rudimentary tape input routines to bootstrap the proper loader from tape. There is also a DMA controller, display generator (also some Intel clone) and 32kB of RAM in sixteen 4116-like chips. I'm not sure yet are these negative-voltage versions or not, but if they are and PSU was bad or someone tried to run it with 5V only, I'm deeply in the bottom.
I have visually inspected the mainboard. The laminate has a poor quality, much worse than Polish or even Ukrainian computers made these times. If something will be bad, I'll just borrow hot-air and try with it training on some old boards before, as using a typical soldering iron will destroy tracks quickly.
The keyboard looks and feels nice, but there should be definitely one more spring in space key. They installed one instead of two in the factory.

I have also looked into power supply unit and there was a thing which surprised me: There is a linear regulator in TO220 package fastened to the large, aluminum heatsink (mounted on holes for TO3 case which was probably not accessible). This heatsink is a typical extrusion, it has a flat part to mount components and a few fins protruding about 1.5cm, there's about 1.5cm between them. Fins end with smaller fins parallel to the flat part, leaving a few mm between.
According to all rules of power supply design the space between these fins should be kept clear of components to allow convection cooling. But in the factory they designed a PCB a bit different and decided to go a different way.
Let's put electrolytic capacitors in there! What can go wrong?
Yes, they put electrolytic caps inside the heatsink windows. I desoldered two and tested them. And after an hour of pumping their maximum voltage, measuring loss current and periodically checking ESR, another surprise: These things are NOT broken.
 

rSl

i'm not tired. you're tired.
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got myself an unicomp ultra classic keyboard. i loved the model m keyboard that came with the late original 'ibm at' i had access to back in the day, so yeah got one again and it's superawesome! :)

here is a video (not mine, i have iso-de layout with large enter key)



now i have to find a source where i can get the tux windows replacement keys here in germany...
 

rygD

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You should have ordered the tux keys at the same time. I love my Unicomp Linux keyboard.

You can get tux stickers if you can't find the keys.
 
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Null

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A new pen since one of mine decided to go walkabout last Thursday, it's a BiC multi ballpoint pen (3 inks + 1 mechanical pencil).

tmp-cam-1737153887.jpgtmp-cam-1450966379.jpg

The top 4 lines are the BiC pen, the bottom 2 lines are my Uni Ball Vision Elite + Vision Elite Micro rollerball pens which I added for comparative purposes.
 
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rSl

i'm not tired. you're tired.
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You should have ordered the tux keys at the same time. I love my Unicomp Linux keyboard.
You can get tux stickers if you can't find the keys.
cool that you have one too! <3
my supplier did not have the tux caps, maybe i can convince them to add these to the shop.
i allready have spare tux and amiga stickers, but i need the real thing. :D
 

rSl

i'm not tired. you're tired.
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If those new stock Model M things have cherry tops this'll do:

thanks!
but unfortunately mx caps are not compatible with model m's buckling spring switches.

mx caps

vs.

model m caps




i would like to get these cute unicomp ones...


but there is a reason they don't sell them here, the 'ultra classic' model, one can get in germany, has a small left win-key and these fine linux-caps are both for large keys.

see

mine came with ugly metro tile-look win8 logo keys, so it's my last resort to use stickers i guess.
oh well, anything is better than having shitty ms logos around! :D
 
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gunrock

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Jan 20, 2011
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Just bought a second had Pine Rock64 with 4Gb and 64GB MMC for about 450 DKK or ~56 GBP (with powersupply) and a case from Amazon for about 7 GBP. I also bought a external USB 3.0 Icy Box NAS enclosure and 4TB Iron wolf drive (another to follow). It's either going to be an OpenMV NAS or just a simple server based on Debian Buster for rsync backups.
 
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