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PS2.TEC
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1990-07-03
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ID:P2 Considerations on PS/2 Machines
DESQview/QEMM Technical Note
Note: These comments are specific to IBM Models 50, 50Z, 60, 70
and 80 and compatibles (at this writing, there are none), that
have the "Microchannel" motherboard. They do not apply to AT's,
PC's, XT's, or compatibles or PS/2 Models 25, 30 or 30-286 which
use standard architecture.
For the most part, if you are running DESQview or QEMM
(Quarterdeck Expanded Memory Manager 386) on PS/2 machines, you
follow the same rules set forth in the DESQview manual for
running on machines with the standard architecture, however there
are a few areas where setup for these machines differ.
1. Optimize Communications: Microchannel machines have a
different interrupt structure than standard architecture
machines. When configuring the DESQview Setup program (under
Performance), you should always be sure the option "Optimize
Communications" is set to "N". Microchannel machines do not seem
to require this for communications and setting this option to "Y"
will result in errors reading your floppy drives.
2. 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) 1990 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *