A YouTube video with a real HC 2000 computer: https://www.youtube.com/watch?v=dlqwF3VTiZA
In this page there is a project to emulate it under Spectaculator emulator.
HC 2000 Emulator for Sinclair Spectrum +3 by Rares Atodiresei
HC 2000 emulator that runs on Sinclair Spectrum +3. It has floppy disk support. It consists on IF1 ROM patches that change the floppy disk access ports to those used on +3. It also relies on writable memory provided by Multiface interface.
I tested on Spectaculator and works very well. Some screens:
I created a spectrum.rom file for 20180922 version of Spectrum core.
The spectrum.rom format is: GLUK + TRDOS + 128K + 48K + 4xPlus3 + PlusD + MF128 + MF3, 8k ROMs are padded to 16k.
I have replaced 4xPLus3 with PL3HC.ROM
But don't work because this core don't enable writes to Multiface 3 rom.
Is it possible to add this functionality to the Spectrum core?