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«Умный дом», «сделай сам» и прочая ардуинщина

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21 hours ago · 2 min read ·
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Radio 86RK — My first self-welded computer (1990)

on Nov 01, 2018 · 1 min read

This is not a complete article yet, but a short note for a comment in ZeroMe :) Maybe later I will write more in detail. The first computer I did with my own hands was Radio 86РК.

Radio86RK.jpg (1200x771)

I started doing it in late 1990, and launched it in the summer of 1991. I had two memory modules defective, and I didn’t have any oscilloscopes or any other tools ... I even determined the status of the data and address buses using a probe from the LED :) But the problem was detected and soon the computer started working. It had 32kbytes of RAM, a 64x25 text screen and a tape recorder as a program carrier.


BARMEN.RK-1.png (936x600)

ALIAZ1.RK-2.png (936x600)

I did not have a tape recorder, so after each turn on of the game and other programs I manually entered byte by byte in hexadecimal form :)

IMG_1048.JPG (800x598)

When the refrigerator was turned on at home, the computer would hang due to a voltage surge. No capacitor banks saved. So, during operation, the refrigerator had to be turned off :D But with this computer I first learned programming in machine codes. I wrote on a piece of paper a program in assembler 8080 (the Soviet analogue is KR580VM80A), manually translated this program into machine codes, arranged the addresses of transitions and in this form entered the program into the computer's memory.

Although now my Radio 86RK is still somewhere stored by my mother in the village, I have not seen him for a long time and I don’t have his photos. Anything higher is on the Internet. My case was the same as in this photo. Only the keyboard was different, with tight little buttons :)

maxresdefault__1_.jpg (1280x720)

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user_name1 day ago
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leftsideon Nov 02, 2018
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I envy those guys who could reach those valuable information at that time.
After 30 yrs later at last I can build the computer out of logic gates, etc.
All those idiot engineers in Korea at that time (even till now) didn't know how to share the western high tech materials for the public.

balancer73on Nov 01, 2018
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ulrichard: but actually building it was out of my reach.

My scholarship at the institute was 55 rubles a month. This is about $80 at the then rate, or about $150 today. True, the residence in the hostel was free and the food we had for half the standard price, but we spent a lot on entertainment. So I managed to save up only 145 rubles (about $350 today) for the first six months of teaching. I spent all this money on the purchase of parts for my first computer :) Then I found places where radio components could be bought several times cheaper. But the first computer cost me the average Soviet wage :)

ulrichardon Nov 01, 2018
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Cool. Brings back old memories. I soldered ISA extensions for my 286. There was a book in the library on how to solder an 8bit computer. I rented out the book a couple of times, but actually building it was out of my reach.

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