EmberBlitz07 wrote on 2026-11-08, 03:09:

Greetings, VOGONS! […]
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Greetings, VOGONS!

I recently got this motherboard for only £5 and wonder - what's the model number for the riser board and such, and are there any for sale?

Perhaps someone in this thread might be able to chime in with the specific part no... Olivetti M4-40/PCS-44C/Familia2 setup disk

Motherboard is also listed on TRW... https://theretroweb.com/motherboards/s/olivet … 4-6x-pcs4xx-t-1

as I repleid in Re: Upgrades for my Olivetti 486 PC its unobtanium, can be seen https://theretroweb.com/motherboards/s/olivet … -60-62-64-65-66 and probably same thing here but no back picture https://theretroweb.com/motherboards/s/olivet … i-ba013-m300-02 and Olivetti PCS33 (386 SX)/M-300 - Repairing
psu Re: Olivetti PCS33 (386 SX)/M-300 - Repairing but no info which pins on riser
your best bet is finding someone with one and persuading them into measuring all 104 pins making you a map, without that its going to be a big guessing game for a lot of pins, a lot of tracing tracks back to chipset/chips to reverse engineer whats what

https://www.youtube.com/watch?v=P1pw0pFJfUY Luckily at 16:46 here we have a decent view of the riser

Oh right TiBo, THE YT Olivetti collector! How did I forget about him 🙁
Its not the best, can almost see where power is going, almost where battery connects (that one can be deduced from chipset pins), can see jumper on riser is a Clear_Cmos. It does show how ISA is wired very clearly almost all pins.

I say its ~90% of info right there.

rasz_pl wrote on Today, 09:09:

Oh right TiBo, THE YT Olivetti collector! How did I forget about him 🙁
Its not the best, can almost see where power is going, almost where battery connects (that one can be deduced from chipset pins), can see jumper on riser is a Clear_Cmos. It does show how ISA is wired very clearly almost all pins.

I say its ~90% of info right there.

I suspect it to be something like an 8 pin Picoblade but I could be wrong.