ID:IC IBM CACHE considerations. 
DESQview/QEMM Technical Note 
by Stan Young

IBM Cache:  The IBM Cache uses exTENDed memory (not exPANDed) and
if loaded after our Expanded memory manager (QEMM), will not see
any memory if you have not taken steps to reserve some extended
memory for the use of the cache.

If you load the cache first, it will see and use extended memory,
but if QEMM is loaded after it, the cache is confused by the memory
mapping done by QEMM and this will result in disk errors. 
Therefore, you should be sure you are loading IBMCACHE after 
QEMM.SYS.

If you are using the IBM Cache on a 386 PS/2 with QEMM, load QEMM 
first and use the "EXTMEM" or "MEMORY" option to reserve the amount
of memory you want to allocate to the cache.  Then load the cache,
allocating to it the amount of memory you have reserved.  Loaded in
this fashion, the cache should operate properly.

This configuration should also be followed if loading other caches
that use extended memory on the PS/2.  Naturally, if you use a
cache that uses exPANDed memory, you would have to load the cache
after QEMM and you would not need to reserve any exTENDed memory.

        Copyright (C) 1991 by Quarterdeck Office Systems
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