]Hello Everyone.
I have a very nice baby AT Lucky Star 5i-VX2B socket 7 motherboard at the centre of my retro games rig, running a 100mhz Pentium. All working great.
I'm trying to get it working at 200Mhz with a newer MMX P55C Pentium and just not getting anywhere.

The motherboard manual states the jumper config for the above CPU and does indeed support it so thats' a good start.
I've selected 2.8v VCORE voltage, 66MHZ Clockspeed, and x3 ratio but just get no post until I swap back in the old 100Mhz chip (and reset jumpers)

At first I thought it was because I was trying the later "Plastic" packaged processor, but yesterday I got hold of a ceramic unit and its exactly the same.

Is there anything more I can try before finding another motherboard? I believe the BIOS is the latest version and works well with HDDs over 8Gb.....

Motherboard info here:
https://stason.org/TULARC/pc/motherboards/L/L … um-5I-VX2B.html

Thanks 😀