With XP and an AMD 1600 proc. the post ran by so fast (pause key not working either) I am not quite sure of the CPDC20 part. Belec Advisor tells me that the BIOS is: BIOS: American Megatrends Inc. 07.00T 07/09/2002.
The CMOS jumper! now there's a point. I shall have to delve into that as a last resort, Everything seems to be working other than not being able to access the BIOS, I forget why I wanted to do that now.