[gridrunner]

Back to the co-pro issue. I've removed the mainboard itself to have a closer look. There is a 0 ohm resistor in W1 and it's soldered in place. Now, the machine had the co-pro option fitted as can be seen from the sticker on the back. However, why would that component be present in W1?

Flipping the board over shows some pretty uneven soldering including some partial joints on the purple and gold HP IC next to the copro socket.

Would this have every worked Tony configured like this? The chap who had this machine paid for the upgrade so that he could use the co-pro for his work. I can remove the link and try to see if it boots with the co-pro attached.