9 Aug
1998
9 Aug
'98
4:21 p.m.
Someone I know has just acquired a motherboard, XT type aftermarket,
with 768k onboard ram. I'm fairly sure the system is going to need a
special driver to access the memory over DOS's 640k. Anyone have such an
animal and can attach it to email or know of a commercial program that
will handle the job?
--------------------------------------------------------------------
Russ Blakeman
RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144
Phone: (502) 756-1749 Data/Fax:(502) 756-6991
Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com
Website: http://members.tripod.com/~RHBLAKE/
ICQ UIN #1714857
AOL Instant Messenger "RHBLAKEMAN"
* Parts/Service/Upgrades and more for MOST Computers*
--------------------------------------------------------------------
9 Aug
9 Aug
5:27 p.m.
New subject: IMSAI part needed
This is a long shot, I know, but I need that part of an IMSAI case that
attaches below the front-panel. It wouldn't be too hard to fabricate, but
I'd prefer the real thing (actually, even better than the real thing would
be the clone part from a TEI case, since it's my TEI clone that's missing
this part).
-- Doug
6:47 p.m.
On Sun, 9 Aug 1998, Russ Blakeman wrote:
Someone I know has just acquired a motherboard, XT
type aftermarket,
with 768k onboard ram. I'm fairly sure the system is going to need a
special driver to access the memory over DOS's 640k. Anyone have such an
animal and can attach it to email or know of a commercial program that
will handle the job?
Have you scanned the files in simtelnet/msdos/xxxx - accessible via
oak.oakland.edu for files related to 'expamded memory' or 'ems'?
- don
--------------------------------------------------------------------
Russ Blakeman
RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144
Phone: (502) 756-1749 Data/Fax:(502) 756-6991
Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com
Website: http://members.tripod.com/~RHBLAKE/
ICQ UIN #1714857
AOL Instant Messenger "RHBLAKEMAN"
* Parts/Service/Upgrades and more for MOST Computers*
--------------------------------------------------------------------
donm(a)cts.com
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
Chairman, Dina-SIG of the San Diego Computer Society
Clinging tenaciously to the trailing edge of technology.
Sysop - Elephant's Graveyard (CP/M) - 619-454-8412
*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*
see old system support at http://www.psyber.com/~tcj
visit the "Unofficial" CP/M Web site at http://cdl.uta.edu/cpm
with Mirror at http://www.mathcs.emory.edu/~cfs/cpm
8:54 p.m.
Don Maslin wrote:
On Sun, 9 Aug 1998, Russ Blakeman wrote:
I guess that's my next place to look....Thanks
--------------------------------------------------------------------
Russ Blakeman
RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144
Phone: (502) 756-1749 Data/Fax:(502) 756-6991
Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com
Website: http://members.tripod.com/~RHBLAKE/
ICQ UIN #1714857
AOL Instant Messenger "RHBLAKEMAN"
* Parts/Service/Upgrades and more for MOST Computers*
--------------------------------------------------------------------
Someone I know has just acquired a motherboard,
XT type aftermarket,
with 768k onboard ram. I'm fairly sure the system is going to need a
special driver to access the memory over DOS's 640k. Anyone have such an
animal and can attach it to email or know of a commercial program that
will handle the job?
Have you scanned the files in simtelnet/msdos/xxxx - accessible via
oak.oakland.edu for files related to 'expamded memory' or 'ems'?
10 Aug
10 Aug
11:53 a.m.
Russ Blakeman wrote:
Someone I know has just acquired a motherboard, XT type aftermarket,
with 768k onboard ram. I'm fairly sure the system is going to need a
special driver to access the memory over DOS's 640k. Anyone have such
an
animal and can attach it to email or know of a commercial program that
will handle the job?
Quarterdeck used to offer a program called QRAM (IIRC) that would allow
more than the 640K Ram to be used. I know it would work with 286
computers, but don't know about XTs.
1:27 p.m.
Marvin wrote:
Russ Blakeman wrote:
We'll try anythig until he gets it right. At one time this stuff was so
commonplace that even after years with it I forget what and where.
--
--------------------------------------------------------------------
Russ Blakeman
RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144
Phone: (502) 756-1749 Data/Fax:(502) 756-6991
Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com
Website: http://members.tripod.com/~RHBLAKE/
ICQ UIN #1714857
AOL Instant Messenger "RHBLAKEMAN"
* Parts/Service/Upgrades and more for MOST Computers*
--------------------------------------------------------------------
Someone I know has just acquired a motherboard, XT type aftermarket,
with 768k onboard ram. I'm fairly sure the system is going to need a
special driver to access the memory over DOS's 640k. Anyone have such
an
animal and can attach it to email or know of a commercial program that
will handle the job?
Quarterdeck used to offer a program called QRAM (IIRC) that would allow
more than the 640K Ram to be used. I know it would work with 286
computers, but don't know about XTs. 
11 Aug
11 Aug
3:03 a.m.
On 10 Aug 98 at 17:27, Russ Blakeman wrote:
Marvin wrote:
Has he actually powered up this beast yet ? I had an XT from
Phillips that had 768k onboard that I passed on to a friend and I
don't remember it having any sort of memory manager. IIRC the first
time I used it with DOS 3.2 floppies, I was amazed as the mem counter
went up to 640 and just kept going. I imagined it was some trick they
did in bios.
If his doesn't use the full ram, I'll double check with my friend in case I
missed something. I've also got several 286 mem managers someplace here
but I doubt if they will work with an XT.
ciao larry
lwalker(a)interlog.com
Russ Blakeman wrote:
We'll try anythig until he gets it right. At one time this stuff was so
commonplace that even after years with it I forget what and where.
--------------------------------------------------------------------
Russ Blakeman
Someone I know has just acquired a motherboard, XT type aftermarket,
with 768k onboard ram. I'm fairly sure the system is going to need a
special driver to access the memory over DOS's 640k. Anyone have such
an
animal and can attach it to email or know of a commercial program that
will handle the job?
Quarterdeck used to offer a program called QRAM (IIRC) that would allow
more than the 640K Ram to be used. I know it would work with 286
computers, but don't know about XTs. 
5:18 a.m.
It was thus said that the Great Lawrence Walker once stated:
Has he actually powered up this beast yet ? I had an XT from
Phillips that had 768k onboard that I passed on to a friend and I
don't remember it having any sort of memory manager. IIRC the first
time I used it with DOS 3.2 floppies, I was amazed as the mem counter
went up to 640 and just kept going. I imagined it was some trick they
did in bios.
If his doesn't use the full ram, I'll double check with my friend in case I
missed something. I've also got several 286 mem managers someplace here
but I doubt if they will work with an XT.
The infamous 640K limit isn't a fault of Microsoft (well, partly, but not
entirely) but of IBM. The memory map of an IBM PC (or PClone) has RAM
stopping at $9FFFF, or 640K. Memory starting at $A0000 is reserved and if I
recall, it's mapped out as:
$00000 RAM
$A0000 Reserved or EGA/VGA graphics memory
$B0000 MDA or CGA graphics memory
$C0000 Reserved or Expansion ROM
$D0000 Reserved or Expansion ROM
$E0000 Reserved, Expansion ROM or Extended BIOS
$F0000 BIOS
More or less. But you have to remember, that's for a 100% compatible IBM
PC clone. Remove that restriction and you can have more memory. MS-DOS can
work fine with more memory, but its problem is that the memory has to be
contiguous (Thanks Microsoft. And while you're at it, could you make it
non-reentrant? Perfect ... ).
-spc (Remembers more of this than he wants to ... )
9482
days inactive
9484
days old
7 comments
6 participants
participants (6)
-
donm＠cts.com -
lwalker＠mail.interlog.com -
marvin＠rain.org -
rhblake＠bbtel.com -
spc＠armigeron.com -
yowza＠yowza.com