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1990-08-30
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ID:QE QEMM-50/60 Hardware Requirements
Quarterdeck Technical Note
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) 1990 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *