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Author Archives: Administrator
Repair of the Atari 2600 jr
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
Thing to know: Z80 CPU clock
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
AM modulation, schematics, lots of transistors and perfect modulation
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
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
ZX LCD
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
Cartridge for Commodore 64
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
ZX Spectrum inside CPLD
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
Fancy soldering
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
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
My collection of old computer
For a long time, I collected a small collection of computer hardware. Here is the link to my Old Bits Collection.