<s>
Quarterdeck	B-Device
Expanded	I-Device
Memory	I-Device
Manager	I-Device
(	O
QEMM	B-Device
)	O
is	O
a	O
memory	B-General_Concept
manager	I-General_Concept
produced	O
by	O
Quarterdeck	O
Office	O
Systems	O
in	O
the	O
late	O
1980s	O
through	O
the	O
late	O
1990s	O
.	O
</s>
<s>
It	O
was	O
the	O
most	O
popular	O
third-party	O
memory	B-General_Concept
manager	I-General_Concept
for	O
the	O
MS-DOS	B-Application
and	O
other	O
DOS	B-Device
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
QRAM	O
A	O
memory	B-General_Concept
manager	I-General_Concept
for	O
Intel	B-General_Concept
80286	I-General_Concept
or	O
higher	O
CPUs	B-General_Concept
.	O
</s>
<s>
It	O
supports	O
Chips	O
and	O
Technologies	O
chipsets	B-Device
.	O
</s>
<s>
QEXT	O
correctly	O
reallocates	O
eXtended	B-Device
Memory	I-Device
Specification	O
(	O
XMS	O
)	O
.	O
</s>
<s>
It	O
includes	O
VIDRAM	O
,	O
Optimize	O
,	O
LOADHI	O
from	O
QEMM	B-Device
6.02	O
,	O
Manifest	O
1.13	O
.	O
</s>
<s>
Earlier	O
versions	O
of	O
QRAM	O
also	O
supported	O
the	O
older	O
8086	B-General_Concept
and	O
8088	B-Device
CPUs	B-General_Concept
.	O
</s>
<s>
QEMM	B-Device
Game	O
Edition	O
It	O
is	O
a	O
version	O
of	O
QEMM	B-Device
that	O
includes	O
Quarterdeck	O
GameRunner	O
.	O
</s>
<s>
Patches	O
for	O
regular	O
QEMM	B-Device
do	O
not	O
work	O
on	O
QEMM	B-Device
Game	O
Edition	O
.	O
</s>
<s>
QEMM	B-Device
MegaBundle	O
In	O
the	O
version	O
shipped	O
with	O
Borland	B-Application
SideKick	I-Application
for	O
Windows	O
,	O
it	O
is	O
a	O
version	O
with	O
SideBar	O
1.00	O
(	O
1994-08-22	O
)	O
and	O
QEMM	B-Device
7.5	O
.	O
</s>
<s>
DESQview	B-Operating_System
386	B-General_Concept
It	O
includes	O
DESQview	B-Operating_System
and	O
QEMM-386	B-Device
.	O
</s>
<s>
QEMM	B-Device
provides	O
access	O
to	O
the	O
Upper	B-Device
Memory	I-Device
Area	I-Device
(	O
UMA	B-Device
)	O
and	O
memory	O
through	O
the	O
Expanded	B-Device
Memory	I-Device
Specification	I-Device
(	O
EMS	B-Device
)	O
,	O
Extended	B-Device
Memory	I-Device
Specification	O
(	O
XMS	O
)	O
,	O
Virtual	O
Control	O
Program	O
Interface	O
(	O
VCPI	O
)	O
and	O
DOS	B-Device
Protected	B-Application
Mode	I-Application
Interface	O
(	O
DPMI	O
)	O
.	O
</s>
<s>
Quickboot	O
:	O
It	O
allows	O
a	O
form	O
of	O
warm	O
reboot	O
or	O
local	O
reboot	O
to	O
be	O
performed	O
without	O
going	O
through	O
the	O
BIOS	B-Operating_System
.	O
</s>
<s>
It	O
will	O
therefore	O
completely	O
bypass	O
the	O
POST	B-Device
,	O
including	O
the	O
BIOS	B-Operating_System
startup	O
screen	O
and	O
the	O
time-consuming	O
memory	O
test	O
and	O
device	O
enumeration	O
,	O
and	O
just	O
restore	O
the	O
CPU	O
state	O
and	O
interrupts	B-Application
to	O
their	O
initial	O
state	O
after	O
POST	B-Device
.	O
</s>
<s>
It	O
relocates	O
DOS	B-Device
kernel	O
,	O
COMMAND.COM	O
interpreter	O
,	O
DOS	B-Device
resources	O
(	O
e.g.	O
</s>
<s>
It	O
supports	O
DOS	B-Device
3.2	O
or	O
higher	O
.	O
</s>
<s>
It	O
allows	O
drivers	O
to	O
be	O
loaded	O
before	O
loading	O
QEMM	B-Device
and	O
still	O
allow	O
the	O
use	O
of	O
QEMM	B-Device
's	O
Stealth	O
feature	O
.	O
</s>
<s>
It	O
was	O
a	O
virtual	B-General_Concept
memory	I-General_Concept
compression	I-General_Concept
utility	O
for	O
Windows	B-Application
3.1	I-Application
,	O
Windows	O
For	O
Workgroups	O
and	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
MagnaRAM	B-Application
is	O
included	O
with	O
QEMM	B-Device
97	O
.	O
</s>
<s>
MagnaRAM	B-Application
was	O
also	O
released	O
as	O
a	O
separate	O
utility	O
.	O
</s>
<s>
MagnaRAM	B-Application
worked	O
by	O
replacing	O
a	O
portion	O
of	O
Windows	O
 '	O
virtual	B-Architecture
memory	I-Architecture
system	O
.	O
</s>
<s>
MagnaRAM	B-Application
would	O
insert	O
itself	O
in	O
the	O
string	O
of	O
Windows	O
Programs	O
that	O
determined	O
what	O
pieces	O
of	O
RAM	O
will	O
be	O
moved	O
to	O
the	O
hard	O
disk	O
.	O
</s>
<s>
Instead	O
of	O
writing	O
directly	O
to	O
the	O
hard	O
disk	O
,	O
the	O
information	O
to	O
be	O
written	O
would	O
go	O
to	O
MagnaRAM	B-Application
's	O
own	O
buffer	O
as	O
this	O
was	O
a	O
faster	O
process	O
.	O
</s>
<s>
During	O
CPU	O
idle	O
,	O
MagnaRAM	B-Application
would	O
compress	O
the	O
information	O
in	O
its	O
own	O
RAM	O
buffer	O
.	O
</s>
<s>
1.12	O
can	O
identify	O
PS/2	B-Device
Model	O
57SX	O
,	O
Compaq	O
Deskpro	O
486s/16M	O
,	O
Sharp	O
MZ-100	O
.	O
</s>
<s>
Available	O
EMS	B-Device
in	O
System	O
Overview	O
screen	O
was	O
corrected	O
when	O
using	O
Stealth	O
.	O
</s>
<s>
1.13	O
fixed	O
Award	O
BIOS	B-Operating_System
identification	O
problem	O
.	O
</s>
<s>
Version	O
2.0	O
provides	O
information	O
on	O
network	O
,	O
enhance	O
reporting	O
of	O
video	O
capabilities	O
,	O
APM	O
,	O
DPMI/VCPI/EMS/XMS	O
memory	O
.	O
</s>
<s>
New	O
feature	O
include	O
editing	O
DOS	B-Device
and	O
Windows	O
boot	O
configuration	O
files	O
.	O
</s>
<s>
Shipped	O
with	O
QEMM	B-Device
and	O
DESQview	B-Operating_System
.	O
</s>
<s>
QDPMI	O
is	O
a	O
DPMI	O
0.9	O
server	O
driver	O
,	O
authored	O
by	O
Dan	B-Device
Spear	I-Device
.	O
</s>
<s>
It	O
requires	O
386	B-General_Concept
CPU	O
and	O
QEMM386	B-Device
.	O
</s>
<s>
It	O
is	O
a	O
version	O
of	O
QEMM	B-Device
driver	O
for	O
IBM	B-Device
PS/2	I-Device
Model	O
50	O
and	O
60	O
.	O
</s>
<s>
It	O
can	O
relocate	O
memory	O
assigned	O
for	O
CGA	O
character	O
set	O
away	O
from	O
UMA	B-Device
.	O
</s>
<s>
Beginning	O
with	O
QEMM	B-Device
version	O
8	O
,	O
it	O
allows	O
ROM	O
contents	O
in	O
UMA	B-Device
to	O
be	O
relocated	O
to	O
provide	O
more	O
memory	O
for	O
TSRs	O
.	O
</s>
<s>
Stealth	O
D*Space	O
allows	O
DoubleSpace	B-General_Concept
or	O
DriveSpace	B-General_Concept
to	O
be	O
loaded	O
high	O
.	O
</s>
<s>
It	O
allows	O
Toshiba	O
laptops	O
to	O
work	O
with	O
QEMM	B-Device
's	O
EMS	B-Device
manager	O
.	O
</s>
<s>
Provides	O
extra	O
conventional	B-Device
memory	I-Device
in	O
text	O
mode	O
programs	O
,	O
by	O
reclaiming	O
buffers	O
located	O
in	O
UMA	B-Device
that	O
are	O
used	O
in	O
graphics	O
modes	O
.	O
</s>
<s>
It	O
requires	O
EGA/VGA	O
-compatible	O
video	O
card	O
.	O
</s>
<s>
VIDRAM	O
EMS	B-Device
supports	O
DMA-based	O
video	O
memory	O
access	O
at	O
the	O
expense	O
of	O
EMS	B-Device
memory	I-Device
for	O
buffer	O
.	O
</s>
<s>
LOADHI.SYS	O
loads	O
up	O
to	O
1	O
device	O
driver	O
at	O
a	O
time	O
in	O
QEMM	B-Device
4.23	O
,	O
2	O
in	O
QEMM	B-Device
5	O
,	O
32	O
in	O
QEMM	B-Device
6	O
.	O
</s>
<s>
Maximum	O
compression	O
threshold	O
setting	O
is	O
100%	O
for	O
all	O
versions	O
of	O
MagnaRAM	B-Application
2.00-2.02	O
,	O
except	O
for	O
MagnaRAM	B-Application
2.00	O
included	O
with	O
QEMM	B-Device
8.00	O
,	O
which	O
has	O
the	O
maximum	O
setting	O
of	O
80%	O
.	O
</s>
<s>
QEMM	B-Device
5.0	O
can	O
manage	O
up	O
to	O
16MB	O
EMS	B-Device
,	O
16MB	O
XMS	O
.	O
</s>
<s>
QEMM	B-Device
6.0	O
can	O
manage	O
up	O
to	O
64MB	O
EMS	B-Device
,	O
64MB	O
XMS	O
.	O
</s>
<s>
QEMM	B-Device
6.02	O
can	O
manage	O
up	O
to	O
128MB	O
EMS	B-Device
,	O
128MB	O
XMS	O
.	O
</s>
<s>
QEMM	B-Device
7.0-7.03	O
can	O
manage	O
up	O
to	O
128MB	O
EMS	B-Device
,	O
128MB	O
XMS	O
.	O
</s>
<s>
QEMM	B-Device
7.04	O
,	O
7.5	O
,	O
8.0-8.3	O
and	O
97	O
(	O
aka	O
QEMM	B-Device
9.0	O
)	O
can	O
manage	O
up	O
to	O
256MB	O
EMS/XMS	O
.	O
</s>
<s>
By	O
default	O
,	O
QEMM	B-Device
7.04	O
and	O
above	O
provide	O
up	O
to	O
a	O
total	O
of	O
64MB	O
RAM	O
shared	O
among	O
XMS	O
,	O
EMS	B-Device
and	O
VCPI	O
memory	O
,	O
unless	O
the	O
USERAM	O
=	O
parameter	O
is	O
used	O
.	O
</s>
<s>
For	O
QEMM	B-Device
7.04	O
and	O
above	O
,	O
the	O
maximum	O
addressable	O
RAM	O
is	O
256MB	O
of	O
memory	O
,	O
shared	O
among	O
XMS	O
,	O
EMS	B-Device
and	O
VCPI	O
memory	O
.	O
</s>
<s>
Initially	O
,	O
XMS	O
allocates	O
the	O
entire	O
256MB	O
and	O
shares	O
it	O
with	O
EMS	B-Device
and	O
VCPI	O
as	O
needed	O
,	O
that	O
is	O
,	O
as	O
EMS	B-Device
and	O
VCPI	O
request	O
memory	O
blocks	O
,	O
XMS	O
free	O
memory	O
is	O
reduced	O
by	O
that	O
same	O
amount	O
.	O
</s>
<s>
Versions	O
up	O
to	O
QEMM	B-Device
6.01	O
can	O
process	O
batch	O
files	O
up	O
to	O
9KB	O
,	O
and	O
20KB	O
in	O
QEMM	B-Device
6.02	O
.	O
</s>
<s>
Batch	O
file	O
line	O
limit	O
is	O
512	O
for	O
QEMM	B-Device
versions	O
up	O
to	O
6.02	O
.	O
</s>
<s>
Stealth	O
D*Space	O
does	O
not	O
support	O
Windows	B-Application
95	I-Application
or	O
later	O
versions	O
of	O
DriveSpace	B-General_Concept
.	O
</s>
<s>
Originally	O
,	O
the	O
product	O
was	O
called	O
QEMM-386	B-Device
(	O
requiring	O
an	O
Intel	B-General_Concept
80386	I-General_Concept
and	O
DOS	B-Application
3.30	I-Application
.	O
</s>
<s>
)	O
,	O
and	O
was	O
released	O
with	O
a	O
complementary	O
product	O
called	O
QRAM	O
(	O
for	O
use	O
on	O
intel	B-General_Concept
80286	I-General_Concept
and	O
8088	B-Device
)	O
.	O
</s>
<s>
The	O
386	B-General_Concept
suffix	O
was	O
dropped	O
starting	O
with	O
QEMM	B-Device
version	O
7.0	O
in	O
1993	O
,	O
when	O
Intel	O
released	O
the	O
Intel	B-General_Concept
Pentium	I-General_Concept
on	O
March	O
22	O
,	O
1993	O
.	O
</s>
<s>
The	O
final	O
release	O
was	O
re-branded	O
as	O
QEMM	B-Device
97	O
to	O
follow	O
Microsoft	O
's	O
new	O
branding	O
trend	O
of	O
using	O
year	O
released	O
instead	O
of	O
version	O
numbers	O
,	O
specifically	O
,	O
Windows	B-Application
95	I-Application
and	O
Windows	B-Application
95	I-Application
OSR2	O
.	O
</s>
<s>
Supported	O
Intel	B-General_Concept
80386	I-General_Concept
and	O
DOS	B-Application
3.30	I-Application
.	O
</s>
<s>
Bundled	O
with	O
QRAM	O
for	O
80286	B-General_Concept
or	O
8088/8086	O
computers	O
.	O
</s>
<s>
Added	O
support	O
for	O
Intel	B-General_Concept
80486	I-General_Concept
,	O
DOS	B-Application
4.01	I-Application
and	O
Windows	B-Application
3.0	I-Application
.	O
</s>
<s>
Maximum	O
RAM	O
is	O
16MB	O
XMS/16MB	O
EMS	B-Device
.	O
</s>
<s>
New	O
QEMM	B-Device
parameters	O
include	O
COMPAQ386S	O
(	O
C386S	O
)	O
.	O
</s>
<s>
Added	O
support	O
for	O
DOS	B-Application
5.00a	I-Application
and	O
Windows	O
3.0a	O
.	O
</s>
<s>
Maximum	O
RAM	O
is	O
64MB	O
XMS/64MB	O
EMS	B-Device
.	O
</s>
<s>
QRAM	O
updated	O
to	O
2.02	O
for	O
intel	B-General_Concept
80286	I-General_Concept
and	O
intel	B-Device
8088	I-Device
systems	O
.	O
</s>
<s>
QEMM	B-Device
supports	O
loading	O
XMS	O
driver	O
before	O
QEMM	B-Device
,	O
running	O
Stealth	O
in	O
Windows	B-Application
3.0	I-Application
in	O
386	B-General_Concept
Enhanced	O
mode	O
.	O
</s>
<s>
New	O
QEMM	B-Device
parameters	O
include	O
DISKBUFFRAME	O
=	O
xx	O
(	O
DBF	O
)	O
,	O
EXCLUDESTEALTHINT	O
=	O
xx	O
(	O
XSTI	O
)	O
,	O
SHADOWRAM	O
=	O
xxx	O
(	O
SH	O
)	O
,	O
UNMAPFREEPAGES	O
=	O
Y/N	O
(	O
UFP	O
)	O
,	O
WINSHRINKUMBS	O
=	O
N	O
(	O
WSU	O
)	O
.	O
</s>
<s>
By	O
default	O
,	O
EMS	B-Device
is	O
un-mapped	O
when	O
Stealth	O
is	O
active	O
.	O
</s>
<s>
Vidram	O
now	O
support	O
systems	O
with	O
over	O
640KB	O
conventional	B-Device
memory	I-Device
,	O
uses	O
EMS	B-Device
by	O
default	O
.	O
</s>
<s>
Dropped	O
the	O
386	B-General_Concept
suffix	O
from	O
the	O
name	O
since	O
Intel	O
introduced	O
the	O
Pentium	B-General_Concept
processor	O
.	O
</s>
<s>
Added	O
support	O
for	O
intel	B-General_Concept
Pentium	I-General_Concept
,	O
DOS	B-Application
6.00	I-Application
and	O
Windows	O
3.10	O
.	O
</s>
<s>
Maximum	O
RAM	O
is	O
128MB	O
XMS/128MB	O
EMS	B-Device
.	O
</s>
<s>
QEMM	B-Device
was	O
rewritten	O
with	O
32-bit	O
code	O
.	O
</s>
<s>
New	O
features	O
include	O
DOSDATA	O
,	O
DOS-Up	O
,	O
Stealth	O
ROM	O
,	O
Stealth	O
DoubleSpace	B-General_Concept
.	O
</s>
<s>
New	O
utilities	O
include	O
SWAPECHO.COM	O
,	O
OPTIMIZE.EXE	O
(	O
replaced	O
OPTIMIZE.COM	O
)	O
,	O
QDPMI	O
(	O
Quarterdeck	O
DPMI	O
0.9	O
host	O
)	O
,	O
QSETUP	O
(	O
QEMM	B-Device
Setup	O
for	O
Windows	O
)	O
,	O
SCANMEM.COM	O
(	O
USERAM	O
=	O
memory	O
scanner	O
)	O
.	O
</s>
<s>
Add	O
support	O
of	O
Virtual	O
Mode	O
Extensions	O
and	O
Page	B-General_Concept
Size	I-General_Concept
Extensions	I-General_Concept
found	O
in	O
Pentium	B-General_Concept
,	O
later	O
Intel	B-General_Concept
80486	I-General_Concept
,	O
or	O
later	O
CPUs	B-General_Concept
;	O
Bus-Mastering	O
hard	O
drives	O
.	O
</s>
<s>
Added	O
support	O
for	O
reading	O
qemm	B-Device
configuration	O
file	O
,	O
@filename	O
.	O
</s>
<s>
Added	O
support	O
for	O
DOS	B-Application
6.00	I-Application
Multi-Config	O
in	O
CONFIG.SYS	O
,	O
IF	O
statements	O
in	O
AUTOEXEC.BAT	O
.	O
</s>
<s>
Vidram	O
can	O
now	O
operate	O
in	O
Windows	O
Enhanced	O
mode	O
DOS	B-Device
windows	O
.	O
</s>
<s>
QEMM	B-Device
7.0x	O
loads	O
itself	O
to	O
shadow	O
RAM	O
by	O
default	O
.	O
</s>
<s>
VIDRAM	O
no	O
longer	O
suppress	O
interrupt	B-Application
10	O
,	O
function	O
1B	O
calls	O
(	O
Video	O
BIOS	B-Operating_System
Functionality	O
and	O
State	O
Information	O
for	O
MCGA/VGA	O
)	O
.	O
</s>
<s>
Stealth	O
DoubleSpace	B-General_Concept
virtualizes	O
DOS	B-Device
Function	O
9	O
.	O
</s>
<s>
QEMM	B-Device
driver	O
now	O
supports	O
Compaq	O
20/e	O
and	O
25/e	O
.	O
</s>
<s>
Added	O
support	O
for	O
DOS	B-Application
6.20	I-Application
.	O
</s>
<s>
Maximum	O
RAM	O
is	O
256MB	O
XMS/256MB	O
EMS	B-Device
.	O
</s>
<s>
DOS-Up	O
now	O
supports	O
Novell	O
DOS	B-Device
7	O
.	O
</s>
<s>
In	O
DR	O
DOS	B-Device
6.0	O
and	O
Novell	O
DOS	B-Device
7	O
,	O
only	O
DOS	B-Device
resource	O
is	O
loaded	O
high	O
.	O
</s>
<s>
QEMM	B-Device
supports	O
DESQview/X	O
2.0	O
server	O
.	O
</s>
<s>
New	O
features	O
include	O
Stealth	O
D*Space	O
which	O
supports	O
both	O
drive	O
compression	O
techniques	O
,	O
DrvSpace	B-General_Concept
(	O
DOS	B-Application
6.22	I-Application
)	O
and	O
DblSpace	B-General_Concept
(	O
DOS	O
6.20-DOS	O
6.00	O
)	O
;	O
replacing	O
Stealth	O
DoubleSpace	B-General_Concept
.	O
</s>
<s>
Improved	O
Pentium	B-General_Concept
support	O
with	O
DigiSpeech	O
Portable	O
Sound	O
parallel	O
port	O
sound	O
card	O
.	O
</s>
<s>
QEMM	B-Device
7.5	O
no	O
longer	O
loads	O
itself	O
to	O
shadow	O
RAM	O
.	O
</s>
<s>
Added	O
support	O
for	O
DOS	B-Application
6.22	I-Application
,	O
Windows	O
3.11	O
and	O
Windows	O
for	O
Workgroups	O
3.11	O
.	O
</s>
<s>
Maximum	O
RAM	O
is	O
256MB	O
XMS/256MB	O
EMS	B-Device
.	O
</s>
<s>
Improved	O
OPTIMIZE	O
so	O
it	O
finds	O
EMS	B-Device
in	O
hardware	O
detection	O
phase	O
.	O
</s>
<s>
Attempted	O
to	O
support	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
Updated	O
MagnaRAM	B-Application
2.02	O
.	O
</s>
<s>
QEMM	B-Device
v8.0	O
did	O
not	O
take	O
full	O
advantage	O
of	O
the	O
new	O
capabilities	O
of	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
It	O
simply	O
acted	O
as	O
if	O
it	O
was	O
Windows	O
3.11	O
and	O
relied	O
on	O
Windows	B-Application
95	I-Application
being	O
downward	O
compatible	O
with	O
Windows	B-Application
3.1x	I-Application
.	O
</s>
<s>
Quarterdeck	O
attempted	O
to	O
better	O
integrate	O
v8.x	O
with	O
Windows	B-Application
95	I-Application
with	O
patch	O
v8.01	O
and	O
the	O
final	O
patch	O
v8.03	O
.	O
</s>
<s>
Improved	O
support	O
for	O
Windows	B-Application
95	I-Application
and	O
under-laying	O
DOS	B-Device
7.00	O
.	O
</s>
<s>
Full	O
support	O
for	O
pure	O
DOS	B-Application
6.22	I-Application
with	O
Windows	B-Application
3.11	I-Application
or	I-Application
Windows	I-Application
for	I-Application
Workgroups	I-Application
3.11	I-Application
.	O
</s>
<s>
Bug	O
fixes	O
including	O
improvements	O
to	O
QEMM386	B-Device
,	O
DOS-Up	O
,	O
LOADHI	O
.	O
</s>
<s>
Final	O
official	O
patch	O
to	O
QEMM	B-Device
v8.x	O
(	O
March	O
25	O
,	O
1997	O
)	O
back-ports	O
many	O
improvements	O
from	O
soon-to-be	O
released	O
QEMM	B-Device
97	O
.	O
</s>
<s>
Full	O
support	O
for	O
Windows	O
95/98/98SE	O
(	O
not	O
ME	B-Device
)	O
.	O
</s>
<s>
QEMM	B-Device
v8.03	O
lacks	O
capabilities	O
under	O
Windows	B-Application
95	I-Application
(	O
And	O
does	O
n't	O
work	O
with	O
Windows	B-Device
98	I-Device
)	O
.	O
</s>
<s>
New	O
utilities	O
include	O
MagnaRAM	B-Application
,	O
optimizing	O
Windows	O
9x	O
paging	O
file	O
.	O
</s>
<s>
Run	O
the	O
installer	O
from	O
within	O
Windows	O
,	O
and	O
it	O
will	O
fully	O
integrate	O
QEMM	B-Device
97	O
with	O
Windows	O
configuration	O
files	O
and	O
registry	O
updating	O
system.ini	O
,	O
adding	O
QEMM	B-Device
group	O
,	O
auto	O
starting	O
QEMM	B-Device
monitoring	O
,	O
etc	O
.	O
</s>
<s>
However	O
,	O
run	O
the	O
installer	O
,	O
install.exe	O
,	O
from	O
a	O
pure	O
DOS	B-Device
(	O
DOS	B-Device
7.10	O
or	O
DOS	B-Application
6.22	I-Application
)	O
without	O
Windows	O
present	O
,	O
and	O
it	O
will	O
configure	O
and	O
install	O
only	O
the	O
DOS	B-Device
utilities	O
;	O
updating	O
only	O
DOS	B-Device
's	O
config.sys	O
and	O
autoexec.bat	O
files	O
.	O
</s>
<s>
QEMM	B-Device
provides	O
up	O
to	O
635K	O
free	O
conventional	B-Device
memory	I-Device
(	O
RAM	O
under	O
640K	B-Device
)	O
,	O
far	O
better	O
than	O
pure	O
MS-DOS	B-Application
EMM386	B-Device
,	O
FreeDOS	B-Application
JEMM386	O
,	O
UMBPCI	O
and	O
many	O
other	O
memory	B-General_Concept
manager	I-General_Concept
programs	O
.	O
</s>
<s>
QEMM	B-Device
maximum	O
RAM	O
is	O
635K	O
free	O
conventional	B-Device
memory	I-Device
with	O
up	O
to	O
256MB	O
XMS/256MB	O
EMS	B-Device
shared	O
.	O
</s>
<s>
QEMM	B-Device
provides	O
the	O
best	O
benefits	O
to	O
MS-DOS	B-Application
6.22	O
or	O
older	O
since	O
DOS	B-Device
's	O
.	O
</s>
<s>
MS-DOS	B-Application
6.22	O
provides	O
619K	O
free	O
conventional	B-Device
memory	I-Device
and	O
up	O
to	O
64MB	O
XMS/32MB	O
EMS	B-Device
shared	O
RAM	O
.	O
</s>
<s>
Assuming	O
unaltered	O
MS-DOS	B-Application
6.22	O
,	O
without	O
3rd	O
party	O
utilities	O
,	O
i.e.	O
</s>
<s>
QEMM	B-Device
increases	O
the	O
available	O
free	O
conventional	O
RAM	O
to	O
635K	O
with	O
shared	O
256MB	O
XMS/256MB	O
EMS	B-Device
.	O
</s>
<s>
While	O
using	O
Windows	B-Application
3.11	I-Application
or	I-Application
Windows	I-Application
For	I-Application
Workgroups	I-Application
3.11	I-Application
,	O
QEMM	B-Device
provides	O
additional	O
free	O
conventional	B-Device
memory	I-Device
for	O
DOS	B-Device
Prompt	O
running	O
under	O
Windows	O
.	O
</s>
<s>
QEMM	B-Device
is	O
well	O
suited	O
for	O
Windows	O
3.x	O
as	O
has	O
supported	O
for	O
it	O
since	O
QEMM	B-Device
v5.x	O
as	O
early	O
as	O
1990	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
QEMM	B-Device
8.03	O
or	O
QEMM	B-Device
97	O
integrate	O
very	O
well	O
with	O
Windows	O
3.11/WFW	O
3.11	O
.	O
</s>
<s>
QEMM	B-Device
increases	O
the	O
available	O
free	O
conventional	O
RAM	O
for	O
MS-DOS	B-Application
7.10	O
and	O
also	O
for	O
DOS	B-Device
Prompt	O
under	O
Windows	B-Application
95	I-Application
OSR2/Windows	O
98	O
SE	O
.	O
</s>
<s>
However	O
,	O
QEMM	B-Device
maximum	O
RAM	O
is	O
a	O
shared	O
256MB	O
XMS/256MB	O
EMS	B-Device
,	O
which	O
is	O
less	O
than	O
what	O
DOS	B-Device
7.10	O
and	O
Windows	O
95/98	O
support	O
without	O
QEMM	B-Device
.	O
</s>
<s>
MS-DOS	B-Application
7.10	O
provides	O
624K	O
free	O
conventional	B-Device
memory	I-Device
and	O
up	O
to	O
1GB	O
XMS/32MB	O
EMS	B-Device
;	O
assuming	O
unaltered	O
MS-DOS	B-Application
,	O
using	O
HIMEM.SYS	O
and	O
EMM386.EXE	B-Device
without	O
any	O
3rd	O
party	O
utilities	O
.	O
</s>
<s>
Thus	O
,	O
QEMM	B-Device
is	O
compatible	O
with	O
MS-DOS	B-Application
7.10	O
and	O
Windows	O
9x	O
and	O
provides	O
slightly	O
more	O
free	O
conventional	O
RAM	O
but	O
it	O
does	O
lower	O
the	O
maximum	O
RAM	O
to	O
256MB	O
XMS/256MB	O
EMS	B-Device
.	O
</s>
<s>
EMS	B-Device
memory	I-Device
normally	O
uses	O
a	O
64KB	O
of	O
UMB	O
as	O
the	O
Page	O
Frame	O
,	O
this	O
reduces	O
the	O
total	O
UMB	O
available	O
to	O
DOS	B-Device
.	O
</s>
<s>
So	O
some	O
recommend	O
turning	O
off	O
EMS	B-Device
,	O
using	O
the	O
NOEMS	O
switch	O
,	O
to	O
increase	O
the	O
total	O
UMB	O
free	O
by	O
64KB	O
.	O
</s>
<s>
QEMM	B-Device
supports	O
NOEMS	O
switch	O
,	O
however	O
,	O
it	O
is	O
far	O
better	O
to	O
provide	O
EMS	B-Device
than	O
saving	O
the	O
64K	O
Page	O
Frame	O
.	O
</s>
<s>
QEMM	B-Device
takes	O
advantage	O
of	O
EMS	B-Device
memory	I-Device
and	O
usually	O
will	O
create	O
more	O
free	O
RAM	O
in	O
the	O
lower	O
1M	O
address	O
space	O
than	O
the	O
64KB	O
required	O
for	O
EMS	B-Device
.	O
</s>
<s>
QEMM	B-Device
StealthROM	O
,	O
SqueezeFrame	O
,	O
and	O
Stealth	O
D*Space	O
all	O
require	O
EMS	B-Device
to	O
work	O
by	O
mapping	O
ROM	O
and	O
data	O
buffers	O
into	O
EMS	B-Device
,	O
thus	O
freeing	O
more	O
UMB	O
's	O
.	O
</s>
<s>
QEMM	B-Device
's	O
TechNote	O
FRAME.TEC	O
states	O
:	O
"	O
Thus	O
any	O
advice	O
to	O
remove	O
the	O
page	O
frame	O
is	O
penny-wise	O
and	O
pound-foolish	O
.	O
</s>
<s>
Hold	O
ALT	O
key	O
during	O
boot	O
and	O
qemm386.sys	O
will	O
not	O
load	O
but	O
prompt	O
to	O
hit	O
Esc	O
to	O
skip	O
loading	O
.	O
</s>
<s>
Alternatively	O
,	O
hold	O
F5	O
so	O
DOS	B-Device
skips	O
loading	O
all	O
of	O
config.sys	O
+	O
autoexec.bat	O
or	O
hold	O
F8	O
so	O
DOS	B-Device
prompt	O
Y/N	O
to	O
confirm	O
each	O
line	O
in	O
config.sys	O
and	O
autoexec.bat	O
;	O
allowing	O
you	O
to	O
skip	O
loading	O
qemm386.sys	O
,	O
dos-up	O
,	O
dosdata	O
,	O
etc	O
.	O
</s>
<s>
Microsoft	O
released	O
comparable	O
but	O
simpler	O
memory	O
managers	O
of	O
its	O
own	O
-	O
HIMEM.SYS	O
for	O
XMS	O
and	O
EMM386.EXE	B-Device
for	O
EMS	B-Device
with	O
MS-DOS	B-Application
4.01	O
in	O
1989	O
;	O
earlier	O
Windows/386	B-Application
2.1	I-Application
included	O
a	O
built-in	O
EMM	O
which	O
offered	O
EMS	B-Device
to	O
DOS	B-Device
windows	O
during	O
Windows	O
sessions	O
only	O
.	O
</s>
<s>
These	O
versions	O
could	O
not	O
yet	O
create	O
Upper	B-Device
Memory	I-Device
Blocks	I-Device
.	O
</s>
<s>
Digital	O
Research	O
's	O
DR	O
DOS	B-Device
5.0	O
(	O
1990	O
)	O
was	O
the	O
first	O
non-vendor-specific	O
DOS	B-Device
to	O
offer	O
the	O
UMB	O
technology	O
,	O
incorporating	O
a	O
386-mode	O
XMS/EMS	O
manager	O
also	O
called	O
EMM386	B-Device
.	O
</s>
<s>
It	O
could	O
also	O
allocate	O
some	O
of	O
the	O
video	O
memory	O
or	O
EMS	B-Device
memory	I-Device
as	O
UMB	O
memory	O
.	O
</s>
<s>
MS-DOS	B-Application
finally	O
offered	O
UMBs	O
in	O
1991	O
with	O
version	O
5.0	O
.	O
</s>
<s>
MS-DOS	B-Application
'	O
s	O
EMM386	B-Device
required	O
HIMEM	O
to	O
be	O
loaded	O
first	O
,	O
while	O
DR-DOS	O
'	O
s	O
EMM386	B-Device
fulfilled	O
both	O
roles	O
and	O
did	O
not	O
need	O
a	O
separate	O
XMS	O
driver	O
,	O
which	O
was	O
still	O
provided	O
but	O
only	O
needed	O
on	O
80286-based	O
machines	O
(	O
originally	O
named	O
HIDOS.SYS	O
,	O
later	O
HIMEM.SYS	O
)	O
.	O
</s>
<s>
If	O
an	O
XMS	O
driver	O
was	O
loaded	O
before	O
DR-DOS	O
EMM386	B-Device
,	O
it	O
would	O
use	O
this	O
instead	O
of	O
the	O
built-in	O
XMS	O
manager	O
.	O
</s>
<s>
Using	O
an	O
external	O
and	O
possibly	O
customized	O
XMS	O
driver	O
could	O
help	O
overcome	O
issues	O
with	O
BIOS	B-Operating_System
memory	O
reporting	O
functions	O
causing	O
the	O
memory	B-General_Concept
manager	I-General_Concept
not	O
to	O
see	O
all	O
available	O
memory	O
,	O
and	O
on	O
machines	O
using	O
non-standard	O
gate-A20	O
switching	O
methods	O
,	O
whereas	O
using	O
the	O
internal	O
XMS	O
driver	O
EMM386	B-Device
could	O
take	O
advantage	O
of	O
speed-optimized	O
32-bit	O
code	O
for	O
the	O
XMS	O
driver	O
and	O
relocate	O
all	O
but	O
a	O
tiny	O
stub	O
of	O
the	O
XMS	O
driver	O
into	O
Extended	B-Device
Memory	I-Device
.	O
</s>
<s>
DR-DOS	O
EMM386	B-Device
could	O
fill	O
"	O
free	O
"	O
areas	O
with	O
UMBs	O
or	O
map	O
RAM	O
over	O
unused	O
ROM	O
areas	O
in	O
virtual	O
mode	O
,	O
provide	O
support	O
for	O
DPMI	O
(	O
and	O
-	O
in	O
some	O
special	O
issues	O
-	O
DPMS	O
)	O
,	O
and	O
load	O
the	O
support	O
for	O
pre-emptive	O
multitasking	O
and	O
multithreading	O
components	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
While	O
popular	O
when	O
DOS	B-Device
programs	O
were	O
the	O
mainstream	O
,	O
QEMM	B-Device
eventually	O
became	O
largely	O
irrelevant	O
as	O
Windows	O
programs	O
and	O
more	O
intesive	O
DOS	B-Device
programs	O
and	O
games	O
using	O
DOS	B-Device
extenders	I-Device
replaced	O
traditional	O
DOS	B-Device
programs	O
for	O
most	O
users	O
.	O
</s>
<s>
Also	O
,	O
some	O
of	O
the	O
DOS	B-Device
users	O
switched	O
to	O
protected	B-Application
mode	I-Application
operating	B-General_Concept
systems	I-General_Concept
unsupported	O
by	O
QEMM	B-Device
,	O
such	O
as	O
the	O
Windows	B-Device
NT	I-Device
series	I-Device
and	O
Linux	B-Application
.	O
</s>
<s>
The	O
final	O
version	O
was	O
QEMM	B-Device
97	O
,	O
which	O
was	O
compatible	O
with	O
Windows	B-Application
95	I-Application
and	O
later	O
Windows	O
98/ME	O
,	O
but	O
by	O
this	O
point	O
,	O
not	O
only	O
was	O
DOS	B-General_Concept
memory	I-General_Concept
management	I-General_Concept
no	O
longer	O
in	O
high	O
demand	O
,	O
but	O
the	O
remaining	O
competitive	O
DOS	B-Device
applications	O
(	O
including	O
various	O
GNU	B-Operating_System
utilities	O
and	O
text	O
editors	O
)	O
supported	O
EMS	B-Device
,	O
XMS	O
,	O
or	O
DPMI	O
-	O
which	O
reduced	O
demand	O
for	O
conventional	B-Device
memory	I-Device
-	O
or	O
had	O
been	O
ported	O
to	O
Windows	B-Application
95	I-Application
or	O
higher	O
.	O
</s>
<s>
The	O
availability	O
of	O
increasing	O
RAM	O
sizes	O
at	O
low	O
cost	O
served	O
to	O
reduce	O
the	O
need	O
of	O
MagnaRAM	B-Application
.	O
</s>
<s>
Finally	O
,	O
modern	O
PCI	O
chipsets	B-Device
provide	O
documented	O
functionality	O
to	O
remove	O
write	O
protection	O
from	O
unused	O
UMA	B-Device
;	O
in	O
many	O
or	O
most	O
cases	O
,	O
this	O
last	O
fact	O
eliminates	O
the	O
need	O
for	O
QEMM	B-Device
for	O
even	O
those	O
relatively	O
few	O
users	O
who	O
use	O
DOS	B-Device
applications	O
and	O
who	O
might	O
otherwise	O
find	O
QEMM	B-Device
essential	O
.	O
</s>
