The idea is to make a cheap ZX Spectrum 128k clone with minimum components. Some parts of this schematics are grabbed from the Superfo's Harlequin 48k rev.G project (like AC/DC unit, tape in comparator, PAL coder). The heart of this project is real Z80 CPU and ULA implementation on Altera CPLD EPM7128STC100. CPLD design based on successor project Speccy2007 by syd.
This is the first prototype PCB, it just works, it's fully tested, except ZX BUS. Possibly bugs / errors there, need more external devices to test :)
Repository (with schematics diagram, BOM, gerber files and VHDL code) is here: https://github.com/andykarpov/karabas-128/