RedHat hang after VFS Mounted Root

I can install RedHat ASE3 on a virtual machine (Ram set to 600Mb) without any problems. However if I start a Virtual machine with greater than 600Mb then either try and boot an existing image or install a new one it will stop at the line:

VFS: Mounter Root (ext2 fielsystem)

Ocastionally I will see an error "i8253 count to high".

If I then wind down the RAM to below 600Mb I can boot existing images or install new ones.

Anyone have an Ideas how I can start the machine with more that 600Mb?

There appears to be a limit of 620Mb Ram when running RedHat inside a virtual machine. The only workaround is to use the VMware product instead of MS Virtual PC.

I found this site was useful and covers a huge number of operating systems and the problems running under MS Virtual PC.

http://vpc.visualwin.com