Author Archives: Administrator

About Administrator

I am owner of this site.

ARM:0009 STM32CubeMX tool from STM MCUs

Posted on May 27, 2020 by Administrator

There will be several posts about using the cheapest MCU board from China. So called Bluepill- PCB containing STM32F103C8T6 microcontroller, USB connector and some small elements. For a few bucks/euros we have upto 72MHz CPU, 64Kb of ROM and up … Continue reading →

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Collecting horses in Fallout 4

Posted on April 18, 2020 by Administrator

Due to a virus outbreak I was burning my time: It is some type of fetish.

Posted in Anything, Personal | Leave a comment

Repair of the Atari 2600 jr

Posted on April 18, 2020 by Administrator

I found PCB from the classic 2600 JR. It was forcefully removed from the case maybe using a hammer. The PCB is bent, some parts torn out and missing switches. PCB was cracked and several traces were broken. I repaired … Continue reading →

Posted in Anything, Vandalising | Leave a comment

Thing to know: Z80 CPU clock

Posted on April 17, 2020 by Administrator

I just only want to send notes to myself. Z80 CPU clock must be 5Vpp and pure TTL levels sometimes are too low for good and stable CPU work. Even this old CPU is very stable at 5Vpp clock, meanwhile … Continue reading →

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AM modulation, schematics, lots of transistors and perfect modulation

Posted on March 28, 2020 by Administrator

I was testing various AM radios and noticed that I don’t have a proper AM source. The AM broadcasting station in my region is very scarce and weak. Also, I wanted more options for radio receiver testing. I thought that … Continue reading →

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Simple Sinewave generator

Posted on March 27, 2020 by Administrator

There is simple and good way to generate quite pure sine wave: This circuit is not very simple, but results are quite fine: output is pure sine wave. From the other side, this schematics have some minuses: it is hard … Continue reading →

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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 →

Posted in Anything, FPGA | Leave a comment

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 →

Posted in Anything, Vandalising | Leave a comment