Replacement for obsolete Single Board PC

All,

I have been handed a project to locate and obtain a replacement for a
now obsolete single board computer, a win systems SAT-4DX.  Win
systems recommend a newer one, but there is a compatibility issue with
the target hardware that the computer connects to.  The target
hardware utilizes the PC-104 (ISA bus) to memory map hardware into the
15-16Mb range.  The new PC has a minimum of 32 MB (dynamic ram) which
conflicts with this addressing range.

From some research that was done, I see that several manufacturers
seem to support a "memory hole" in the 15-16Mb range, presumably for
this purpose.

I was wondering if anyone who has experience with this issue, ie using
this memory hole to place target hardware and perhaps has a
recommendation for a PC that works with this configuration?