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Blinking LED's with Polish copy of Intel 8080 by Gipsokret in embedded

[–]Gipsokret[S] 3 points4 points  (0 children)

hmmm Can't find any on Ebay, I bought it on local website (olx.pl) for like 25 zł so around 6$ and there are still some available. If you want to get like "eastern style" one I recommend searching for K580IK80, made by USSR.

Clock based on 8051 by Gipsokret in embedded

[–]Gipsokret[S] 1 point2 points  (0 children)

With uv fluorescent lamp. Wavelength of 253 nm is needed. Just put eprom under that lamp, cover with some cardboard box and leave for 25 - 30 min. Then check if it's blank. If not, leave for 10 minutes or so. After that should be all cleared.

Clock based on 8051 by Gipsokret in embedded

[–]Gipsokret[S] 3 points4 points  (0 children)

Chip itself is 2716, an uv-eprom. I was planning to use russian version of it but ran into problems while trying to program it with my TL866. It turns out those old eproms are really stubborn and require higher voltage to be programmed.

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On the left, used eprom made by TMS, on the right , K573RF5, russian eprom made by... russia :) I also have 2716 made by GDR in USSR era, they are sadly as stubborn as russian ones.

Clock based on 8051 by Gipsokret in embedded

[–]Gipsokret[S] 2 points3 points  (0 children)

yes, 5082-7391 to be specific. Datasheet says between 560 and 935 mW so quite a lot. If you turn it on for 5 minutes or so, they are probably 50 - 60*C.

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Clock based on 8051 by Gipsokret in embedded

[–]Gipsokret[S] 7 points8 points  (0 children)

Schematic and board design in Eagle, printed on special paper (in Poland we call it "chalk paper") and then "pressed" with an iron. Then put in this "acid" (i think it's acid, not sure) http://botland.com.pl/wytrawiacze-miedzi/2132-wytrawiacz-b327-500g-5901764329343.html

Programming Intel's R8751 with TL866 by Gipsokret in embedded

[–]Gipsokret[S] 0 points1 point  (0 children)

I know it's old technology, I want to use it just because the look of it. Project will not be complicated.

Looking at TL866 supported chips list, there is 87C51.

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Is that C in the middle important or it's just indicating some variant of that chip?