Vhd interface for victor hc90/95

This flyer lists the functions of the VHD players HD-7100/HD-7100(B) (VHD), HD-7800 (VHD) and HD-7900 (VHDpc).

https://www.msx.pics/image/FhLaF

The HD-7800 supports AHD for digital audio only but an AHD decoder can be added for the digital video. Both are supported by the HD-7900. The HD-7100/HD-7100(B) doesn't support AHD (Advanced High Density Disc).

in wiki page, I/O port list for VHD is not correct. That BDh I/O address is not used, as port B is not connected to anywhere in VHD card. As that is copied from X1 web page, the description also says that it is really used to switch that X1 VHD card to serial/parallel mode. And in MSX case we have always this parallel interface via 8255.

Maybe 0xBDh port is reserved for VHD, but it is not used in MSX case as seen from IF-C9C/D card.
Only 0xBCh, 0xBEh and 0xBFh ports are used. And 8255 is setup to interrupt mode, as VHD cartridge INT pin is connected to 8255 port-C bit-3.

I managed to get some dump from X1 thunder storm, but i suspect it still faulty somewhere. I do not even get anywhere same kind of close square signals for wav file (compared to Matten road blaster dump wav file) when using CZ-8RL1 (high bitrate switch set and normal phase set) ear output to PC line in.
Anyway what i now got, shows that Thunder Storm MSX and X1 have same VHD commands send (except X1 has also U0 and U1 in use):

So the assumption was right that X1 side RG= MSX side reading for G and so on...

And code bytes are same at the beginning of binary files, first 1900h bytes (except some few bytes).

Hello Popolon!
I downloaded the Cas file, but just to be sure, is it the MSX cassette or the X1 cassette?
I think i read you also owned the x1 version. If it is not this one, can you point me to where the file is located on your github?
thank you so much as always :)

Interesting stuff!