Hello,
Jan Kucera has let me know (via @SamC) about a new Computer / Motherboard replacement which is in development.
The website is here:
https://sites.google.com/view/elementzx/home
and the first draft of the manual is here:
https://sites.google.com/view/elementzx/docs
The following links provide some more detail (translated)
https://translate.google.com/translate? ... %23p120592
https://translate.google.com/translate? ... %23p120622
https://translate.google.com/translate? ... %23p120666
Juan is now a member so I'm sure he would be happy to answer any questions
From the website:
eLeMeNt ZX is a powerful ZX Spectrum hardware clone, a new motherboard that in all-in-one solution brings the functionality of a large number of hardware, system add-ons and higher CPU speeds. This device is designed to fit into ZX Spectrum +2 and +2A models' case and this way use also their excellent keyboards. The eLeMeNt ZX is based on a combination of a modern and fast FPGA and the real Z80 CPU to achieve the best compatibility with all ZX Spectrum's software and as well as hardware add-ons and interfaces. Moreover, in order to get some additional new features and a CPU speeds higher than 20MHz, the real Z80 CPU can be switched off and replaced by a FPGA version. The eLeMeNt ZX is my personal and hobby project with the aim of exploring, discovering and testing possibilities of old and renewed ZX Spectrum home computers with a hardware originally based on 8bit technology - therefore it is not intended for commercial purposes. The development is still in progress.
Pricing
Now are the boards available only in the official e-shop https://retrocomp.cz/produkt?id=62
Since this is a hobby project without a standard warranty, I cannot provide a full guarantee on the FPGA board. For this reason, I recommend that you buy the Alchitry Au Artix-7 FPGA Board directly from official retailers. Here are some of them: Digi-Key Electronics - Mouser Electronics