[syslinux] ISOLINUX - specify memory address?

[Falcon4]

I'm wondering if there's a way to specify the memory address that 
ISOLINUX loads its image into. I have a couple "all-in-one" boot CDs 
that use ISOLINUX to load the boot disk images, like Memtest-86, etc, 
that can't load because the memory it's going to be loaded to test is 
bad. For example, one I'm trying to load is a laptop with onboard RAM 
that's bad past the 256mb mark that, when I try to load an image, says 
something like "decompression error". Then, there's a computer that has 
DIMM slot problems, and I need to figure out what stick isn't seated 
right. When I try to load Memtest-86, it gives that same decompression 
error because it's trying to load it into the higher memory addresses, 
it seems.

How can I tell it not to use that RAM?

Thanks!
~ Falcon4

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