Abit PB4 Rev. 1.3 (AB-PB4) ALi 486 Motherboard
Spätes Highend PCI-Board von 1996 für 486er, gedacht für die Verwendung von Cyrix 5×86 oder AMD 5×86, EDO Support und mysteriösem PISA-Slot (braun), der als PCI/ISA Riser-Slot konzipiert ist.
- Intel 486 DX2 66MHz CPU (A80486DX2-66) (P24 SX750 Write Through und P24D SX955 &EW5V1X Write Back)
- Intel Pentium 60MHz CPU (A80501-60 SX948), 5 Volt, für Socket 4
This was my first motherboard and I still have it. Have you ever tested a riser card in the PISA slot? The feature is completely undocumented (I was hoping it might be an undocumented EISA slot). Is it to make the board usable in a low profile case then? It’s very mysterious!
You can read about the PISA Bus here:
https://www.kontron.com/downloads/white_papers/pisad218.pdf?product=87222
The slot is used to plug a single board computer into the slot and operate it there.