Tag Archives: 8bit

Crazy ’80s – computer design with style

When I hear somebody talking that Apple is the pioneer in the computer design, I always want to show photo of Atari XL series: These ones are not the all, they are only ones from my personal collection. Remember, it … Continue reading

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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

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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

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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 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

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

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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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

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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.

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Building 8bit ATARI test ROM in easy way

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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Atari 65XE

Here is my first computer… In fact it is not the same computer I had, as I sold mine for big money and bought cool computer Amiga 500. But this blog post is not about Amiga, but about my old … Continue reading

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