Category Archives: Anything

Unsorted stuff. Regular blog posts.

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 | Tagged 8bit, CPLD/FPGA, Z80, ZX | 1 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 →

Posted in Anything | Tagged 6502, 8bit, C64 | Leave a comment

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 →

Posted in Anything, FPGA, MCU | Tagged 8bit, CPLD/FPGA, DIY, Z80, ZX | 1 Comment

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

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 6502, 8bit, C64, CPLD/FPGA | 12 Comments