I think we can rule that out, I made another partition on the SSD and install Win 7 in AHCI mode (using the defalt AHCI driver in Win 7) and the hardware ID for the AHCI controller is seen as Dev_2923.

I'm not sure which driver file 2923 I chose when I forced the moded driver on XP, maybe I picked the one with AHCI in the name and I should have picked the iastore one? (or the other way around?) I'll give it a try and let you know

Dieter, I finally done it :)

The catch was that this particular controller was NOT requiring to be pointed to iastore.inf but to iaAHCI.inf. By the time I was trying it the system was rebooting before finishing the forceful installation of the drive on the first instance of standard IDEr, so I had to select the second instance of the standard IDE present in my device manager (didn't took a screenshot but I hope it makes sense).
And behold, it worked.

Now in my Device manager it appears like this (the PCI IDe controller is some Jmicron SATA to IDE):

Hopefully this will help others who find themselves in my situation. No registry editing was required.

Thanks a lot.

It's actually all over the internet when you google for "switch win xp to ahci ICH9" or something similar. People usually don't take the time to explain in detail how they did it and what were the system specs (in this case the exact MoBo model). Now I know that those who got it working using iaStor.inf had ICH9r.

Anyway, it all ended well :)

I see, thought the R in ICH9r was for raid. :)

In any case, now the relevant info is spelled out as clear as it gets, if I could find something similar last Saturday it would have saved me a few good hours of toggling between AHCI and IDE. :)

Hi there! I use the enWin7x64_Pro_SP2.10 file iso from Fernando trying to install on my HYSTOU computer which came with WIN 10.

The USB is working but both NVMe and SATA SSD don't show up.

I tried to understand how I can find out the chip set and dismantled the computer to look at the mobo to no avail.
Device manager: " Standard SATA AHCJ Controller:

PCI\VEN_8086&DEV_9DD3&SUBSYS_72708086&REV_30
PCI\VEN_8086&DEV_9DD3&SUBSYS_72708086
PCI\VEN_8086&DEV_9DD3&CC_010601
PCI\VEN_8086&DEV_9DD3&CC_0106

Processor the i7-8565U is a “Whiskey Lake” 8th Gen

Is this enough information?

So it's about the signed driver I can point to during install.

(I previous installed an desktop computer Z390 with said iso which worked like a charm, many thanks again!)

@ Fernando: Thank you for your answer.
I added a SATA SSD because I thought that would allow me to install WIN7.
From what I read the two options are:
1) Fiddle with bios settings and trying to install on de SATA disk anyway if possible
2) Trying to get the NVMe driver to work and install on NVMe disk

I used an ISO from you with an NVMe driver so perhaps that wouldn't work anyway?

@Fernando : Sorry, the ISO " 2.1 ISO win 64 bit English " was from the user PatrickK.

Second sorry: It just dawned on me that the internal SSD, although it looks like it, is isn't a NVMe SSD. (I should have known by the Crystal Disk bench under WIN 10.)

I will try to figure out a way to get it all going. At the moment I think that I should try perhaps a ISO with only an USB driver slipped in and not an NMVe driver also like the one I used.
This all is one step beyond my level of knowledge but I want the small power efficient computer on my boat, and especially in that circumstance WIN10 is for me a 100% no go for perhaps obvious reasons. (I have to be absolutely in charge of network traffic)