Yet another ZX Spectrum clone ;)
ZX Spectrum 128k replica with real Z80 CPU and almost all logic in CPLD Altera EPM7128STC100. PCB designed to fit into original ZX Spectrum 48k (rubber keys) case.
The idea was 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 and it's modified version with single RAM IC by .jackson.
This is the first fabricated prototype PCB, it just works, it's fully tested, except small minor issues (please see ERRATA).
Latest revision: rev.B1.
Forum topic with discussion, new features and bugs is here: zx-pk.ru. (mostly russian-only, sorry about that).
License for this project is WTFPL. More details here.