CrustyCeleron wrote on Today, 18:51:
I reckon the P75 would have easily done 100MHz with a fan if the board was a BA2247. But I think said board shipped with a 100 or 133 anyway!
I think mine had a real P75 (which means nothing by itself, I mean that the CPU was labeled and sold as a 75MHz).
Whatever going to 90 was sort of a mild overclock, no voltage change, no additional fan, nothing. It just worked, and likely could have worked at way higher frequencies if the jumpers were there like in a OEM board. (same thing on the DX4 100 as I already wrote)
The other boards, iirc, were missing the ability to select 66MHz FSB, frustratingly. I wonder if the clock chip was the same across variants? If so there is probably a way to get 66 out of it.
Likely maybe even via SW, but at the time I was not that expert and I wouldn't risk something that I paid almost 1.000.000 of old liras that likely is something like 2000€ in 2026 money (which, in turn, was already 1/4 the original price) .
I always thought it interesting that they went with a Wildcat rather than sticking with the SiS550x they had with the similar-release-age PCS P75/n's (Trigem Torino).
Probably was a separate project, something like the very first PC from 1963 Programma 101 (which was even relabeled as "Calculator" to prevent it to end in the hands of the Americans).
Speaking of the Americans Lockheed had a similar research unit called Skunkworks.
You should document up the boards for theretroweb or the System Specs forum though, as the Envision does not appear to be on there and lacks decent board pictures and documentation online.
That's unbelievable, I'll do but not take your breath, I have some logistic complications ATM
I'd definately find it interesting (especially if you have the MPEG accelerator working).
No, no MPEG card, practically at the time I bought my first Envision 400 (few days after the Win95 release) there were already SW able to play MPEG videos w/o any HW helper, which made the HW card useless.
Together with the machine there were a number of CD bundled, among them the Video CDs of Star Trek II the wrath of Khan. (criminally cropped to 4/3).
P.S. Another thing practically unknown on PCs of that era was the BIOS driven by a proper GUI with mouse support and all, something that became the norm only in the UEFI days, 15 whole years later.