TF> All the documentation says that this should work:

 TF>  rc = DosAllocMem(&mem1,300000000,PAG_WRITE);

 TF>  but it always returns 8, NOT_ENOUGHT_RAM.

 TF>  I can't allocate anything more than 230meg, however
 TF> the documentation says I should be able to get around 448meg per process.

 TF> (The 230meg is a combined number of shared/private ask 
 TF> for more of one, it reduces the amount of the other 
 TF> available.)

 TF>   Any ideas?

The 512mb is an address limitation,  so that thunking to 16:16 can be done
with an easy/quick bit adjustment.

So the answer is yes:  the amount of shared code & data eats away at
your useable address space.

On my machine,  I was able to allocate up to 232650000 bytes before I got an error 8.

I assume you are allocating such a large object with the plans to
not-commit it all (ie: a sparse object).  I suggest you let C++ do it for
you (create a class that looks like a memory pointer but really does file
i/o),  or use Windows NT instead.


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