Adding ZX Spectrum Core?

[Higgy69]

Hi,
Sorry could not see a better way to contact you.
With your excellent work with the Tangs you seem to be the best person to ask. I was wondering if you could port the ZX Spectrum to Tang Nano 9/20K?
What I love about your ports is that you are using the FPGA Companion, so it allows you to create a device either minimalist in size or feature rich.
I am using a Waveshare RP2040 Zero, and have modified an existing 3D print case so the overall device even with a 9pin joystick port is tiny. Just add a wireless keyboard/mouse and you have a pocket retro computer!

Someone has already done some work, but does not use Till's FPGA Companion, so would need a separate physical build and parts. Their work:
https://github.com/andykarpov/tang9k-speccy

Thanks

[vossstef]

@Higgy69,
i think the existing project will likely not be of much help to integrate a full featured ZX system.
Guess best would be a start from https://github.com/MiSTer-devel/ZX-Spectrum_MISTer
and put on top (around) Till's framwork like HID, SPI, SYSCTRL, VIDEO etc.
I also started for VIC20 and C64 rather isolated like this speccsy project and over time migrated to MIST'er base with a number of enhancements.
As i am already maintaining three projects likely i will not do a ZX spectrum. Further developers are very welcome for more cores !