Further investigations on the motherboard 386/25, coming from an HP Vectra, one thing that I found very interesting, is in the Slot ISA area, there are points where you can measure the voltages, of course using the post card, we have LEDs for every single voltage 😬, but sometimes it can happen that you don't have it within reach 🐾, and it should be measured on the ISA slot, in this way you can easily measure if the voltages are present and correct.
I saw the speed in ns on the RAMs, there are 70 and 80 ns chips, in theory so they should be 80 ns RAM (I guess), since the PC is a 25 MHz this speed should be enough to use low WS (0? 1?), I didn't quite understand which are the 4 Cache chips (32 KB), and I don't know if there is a TAG chip, however I didn't look carefully at some small chips, maybe maybe 🤔 they are those.
Moving on to the PS/2 connector area, I will try to look carefully at the mouse connector circuit, I don't know if it is possible to replicate it, but in case it could be something 😨 interesting to build, because it would be a valid alternative to serial ports, in many old PCs, in fact the disk controllers and ports, were on two ISA cards, and therefore you could do without one of the two, obviously the card with serial ports.
Finally the connector of the proprietary power supply, you can read P1 and P2, the P1 is three PIN, and the three PINs are connected to three wires of different color (black yellow red), the order of these wires may be different, but basically it is the +5V of the +12V and the ground wire, so if we had a normal power supply, it would not be so difficult 😩 to connect via an adapter.