Thanks very much to everybody. Disk controller is working ok now....
 

 Not sure what fixed the problem (may  be a compund)

- Implemented exact seek times.
- Got all the floppy lines from the "virtual" floppy
- Reimplemented the track functions.
- Implemented CRC calculation.

It's possible but it's not that easy, doing an FPGA implementation is much easier than doing an actual chip replacement
To do a real chip replacement needs a lot of extra work.

I think the main problem is to "tie" the modern technology with the old. The two devices behave the same on video or sound, but they are very different inside.

Kyp says that FPGA is easier, I think because in some way it is schematic. But he also says that a physical device made of real components can be created with the information. After all what he manages to design a FPGA core is a hardware descriptive language.

Imagine the possible turnarounds taken by the designer to make the chips real on the 80's, It can be that the contemporary FPGA circuit doesn't need so much pins for Dave and Nick, but you still need all the signals to "transplant" the hypothetical clone chip to the real Machine, to be able to return it to life...

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I am not the best source of FPGA knowledge, sorry if I can't give a better explanation.

Yes, there is a preliminary core for the Next(N-go), but it is very old now. Kyp is actually adding EXDOS(floppy controller) and better SD-cartridge management.

Yesterday, a beta of the Enterprise core was presented on the Retrocrypta Twitch channel, with SD, Floppy and mouse working all at the same time on a NeptUNO FPGA. The video can be long and boring for non Spanish viewers, because a lot of the time Rampa(EXDOS floppy controller and Dave sound) and Kyp(Video, SD and main), are discussing with Ron , the  speaker, about some aspects of the implementation.  This while a just launched FPGA system named ZX3+ is discussed. Probably not the definitive Enterprise FPGA, but time will tell. Maybe if one version is launched with a full keyboard, not the shortened one of the N-Go FPGA.

On Twitch the old videos have a limited time to be shown, so hurry up.

Wolf? WOW!