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1991-03-12
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ID:QE QEMM-50/60 Hardware Requirements
Quarterdeck Technical Note #186
by Todd Threadgill
Quarterdeck Expanded Memory Manager 50/60 (QEMM-50/60) is a sophisticated
program that provides expanded memory for IBM PS/2 Models 50 and 60 without
requiring the purchase of a special expanded memory board. In order to work
its magic, however, QEMM-50/60 does have certain hardware requirements that may
be confusing to users. This document is intended to provide a clear and
concise guide to these hardware requirements.
Q: Does QEMM-50/60 work on all PS/2 computers?
A: As its name suggests, QEMM-50/60 only works on IBM PS/2 Models 50, 50Z, and
60. If you have a Model 55SX, you should use Quarterdeck Expanded Memory
Manager - 386 (QEMM-386) for your memory management needs, since the Model 55SX
has an 80386SX processor. If you have a Model 30 or 30-286, the combination of
an EMS 4.0 exPANDed memory board and Quarterdeck's QRAM product will provide
most of the features of QEMM-50/60. The memory boards required by QEMM-50/60
are NOT compatible with either Model 30 PS/2 computer.
Q: I have 2 megabytes of memory on my computer's motherboard. Why doesn't
QEMM-50/60 work?
A: The memory on the Model 50/60 motherboard above 640K is exTENDed memory. On
80286 computers like the 50 and 60, this memory is essentially useless to DOS
programs. Some programs can access exTENDed memory through the use of DOS
extenders, but these are the exception rather than the rule.
However, QEMM-50/60 can make the exTENDed memory on certain expansion cards
behave like exPANDed memory. These cards have special hardware on them that
give them the capability to "rearrange" memory, should one of the card's chips
go bad. The hardware that does this "rearranging" is very similar to expanded
memory hardware, but was not designed with that idea in mind. QEMM takes
advantage of this special hardware feature to make the exTENDed memory look
like exPANDed memory.
QEMM-50/60 works with the following memory cards:
Adapter Memory Board
ID Capacity Name
---------------------------------------------------------------------------
FEFE 0.5-2MB IBM PS/2 80286 Memory Expansion Option
F7FE 2-8MB IBM PS/2 80286 Expanded Memory Adapter /A
F7FE 0-8MB IBM PS/2 0-8MB Expanded Memory Adapter /A
F7F7 2-8MB IBM PS/2 2-8MB 80286 Memory Expansion Option
7011 0-2MB Tecmar MicroRAM
7048 0-8MB Edsun Labs EL2010 chip set
7049 0-8MB Edsun Labs EL2010 chip set
76DA 0-4MB Quadram QuadMEG PS/Q
76DE 0-4MB Quadram QuadMEG PS/Q
7F7E 0-8MB Orchid RamQuest Extra
Note that the Edsun Labs entries are not actually boards, but rather chip
sets that are used by some board manufacturers.
Alternatively, a hardware upgrade will allow you to access all of your
motherboard memory as well as the memory on any expansion cards you may have
installed. Products such as the All Chargecard and the SOTA Pop card will
provide such memory access, as will a conversion to a 386SX processor.
Q: I have different memory boards from different manufacturers on the same
machine. I'd like to use all of the memory with QEMM-50/60. Will I be able
to?
A: Yes. QEMM-50/60 allows you to mix boards from different manufacturers
together and use them ALL as expanded memory. This cannot be done with any
other EMM driver.
Q: I'm thinking of getting an exPANDed memory card for my PS/2. Will
QEMM-50/60 work with it?
A: No - exPANDed memory cards come with their own drivers.
Q: Do I need to disable my motherboard memory in order to use QEMM-50/60?
A: Not for regular use of exPANDed memory. However, in order to multitask
successfully on 80286 systems, reducing the amount of conventional memory is
recommended. When conventional memory is reduced, multiple programs can be run
in exPANDed memory. If you are planning on multitasking, remove the
"X=0000-9FFF" parameter from the QEMM.SYS line in your CONFIG.SYS file.
Copyright (C) 1991 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *