Author Archives: Administrator

About Administrator

I am owner of this site.

Collecting horses in Fallout 4

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

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Repair of Atari 2600 jr

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

Posted in Anything, Vandalising | Leave a comment

Thing to know: Z80 CPU clock

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

Posted in Anything, MCU | Leave a comment

AM modulation, schematics, lots of transistors and perfect modulation

I was testing various AM radios and noticed, that I don’t have 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 though, that the … Continue reading

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Simple Sinewave generator

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

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

Posted in Anything, FPGA | Leave a comment

Cartridge for Commodore 64

Sometimes I want to show how old 8 bit computers work for some n00bs. It is nice to load some game from tape, some from disk. But when I want to show more game, best thing is cartridge. And not … Continue reading

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ZX Spectrum inside CPLD

I found old ZX Spectrum clone made in Soviet Union in 90′s. It was my computer, I wrote several program on it and also, I wrote drivers for Espon printer on this hardware. This model has Soviet chip КР580ВВ55А (Intel … Continue reading

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Fancy soldering

Good fellow donated my collection with 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 very ugly feature- it can travel under conformal coating along … Continue reading

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Testing Commodore 6526/8520 copy in CPLD

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

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