Yet another ZX Spectrum clone ;)
ZX Spectrum compatible machine with real Z80 CPU and all logic inside the CPLD Altera EPM3256ATC144 (or EPM7512).
The idea was to learn KiCAD and make a cheapest and smallest ZX Spectrum clone with minimum components and real CPU. Some parts of this schematics are grabbed from the Karabas-128 and ZX-UNO projects (like RGB DAC, PAL coder, Tape-in logic). The heart of this project is a real SMD Z80 CPU and ULA implementation on Altera CPLD EPM3256ATC144.
The board contains an SD card socket, so at least 2 different configurations are supported:
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Z-Controller based configuration (Pentagon timings, GLUK reset service in the ROM bank 0, 1024kB of extended memory via port #DFFD (Profi))
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DivMMC based configuration (Pentagon timings, ESXDOS 0.8.7 in the ROM bank 0, 128kB of memory)
ERRATA for PCB rev.A: Russian.
ERRATA for PCB rev.B: Russian.
Latest revision: rev.I.
License for this project is WTFPL. More details here.
PCB Rev. H assembly example by Xoomoh (Михайло Капітанов)
