Author Archives: Administrator

About Administrator

I am owner of this site.

ZX LCD

Posted on March 26, 2020 by Administrator

After building ZX Spectrum clone in CPLD I ported hardware code to another project and this is a bit simpler, but it uses some mono LCD from old copy machine. Now I used only one CPLD, but I added an … Continue reading →

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Cartridge for Commodore 64

Posted on March 25, 2020 by Administrator

Sometimes I want to show how old 8 bit computers work for some n00bs. It is nice to load some games from tape, some from disk. But when I want to show more games, the best thing is cartridges. And … Continue reading →

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ZX Spectrum inside CPLD

Posted on March 24, 2020 by Administrator

I found an old ZX Spectrum clone made in Soviet Union in the 90’s. It was my computer, I wrote several programs on it and also, I wrote drivers for Epson printer on this hardware. This model has Soviet chip … Continue reading →

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Fancy soldering

Posted on March 22, 2020 by Administrator

Good fellow donated my collection with a new item- Sharp PC-2500. The only big problem- this old computer had caustic batteries inside and they leaked. Alkaline used in the batteries has a very ugly feature- it can travel under conformal … Continue reading →

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Testing Commodore 6526/8520 copy in CPLD

Posted on March 21, 2020 by Administrator

There are quite expensive obsolete chip from various Commodore computers and peripherals- CIA/PIA MOS 6526 and a bit changed 8520 used in Amiga computers. This is a “complex” peripheral interface adapter chip for 6502 processor or 68K chipset. It is … Continue reading →

Posted in Anything, FPGA, MCU | Tagged , , , | 10 Comments

My collection of old computer

Posted on March 1, 2020 by Administrator

For a long time, I collected a small collection of computer hardware. Here is the link to my Old Bits Collection.

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AVR USB printer device and teletype

Posted on July 11, 2019 by Administrator

I have old teletype printer T-63 (it is made by RTF in Eastern Germany, clone of old Siemens Teletype). And the idea is about connecting it as USB printer to our-days computer. Easiest way is to connect it using RS232 … Continue reading →

Posted in MCU | Tagged , , , | 4 Comments

Building 8bit ATARI test ROM in easy way

Posted on May 3, 2018 by Administrator

I was experimenting with damaged Atari 800XL and I need to test it in low level. I wrote several lines in machine code and it was pain in the ass to fill data to ROM chip. After entering HEX data … Continue reading →

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Partial solar eclipse

Posted on November 13, 2015 by Administrator

This outdated article about some partial solar eclipse- it was in 2008, but to keep both Lithuanian and English blog “synchronized” I leave this article. Info from wiki: As seen from the Earth, a solar eclipse is a type of … Continue reading →

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Klystron

Posted on July 22, 2015 by Administrator

In previous article I mentioned, that I didn’t managed to remove klystrone tube from metal chassis. After some time I managed to remove it… Here is the author of this blog and “little” vacuum tube: All tuning magnets and other … Continue reading →

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