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MEMO1332.TXT
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1992-08-13
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╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ Classic Above Board Memory Board Compatibility ║
║ ║
╚═════════════════════════════════════════════════════════════════════════╝
COMPATIBILITY WITH OTHER EMM'S
There are two types of compatibility with Expanded Memory Managers. One
is Hardware-Dependent compatibility, and the other is Hardware
Independent.
Hardware-Dependent
Different manufacturers' EMM boards are always incompatible with each
other because EMMs are specific to their designated hardware. If you
have boards from 2 different vendors, you would need 2 different EMMs,
but unfortunately computers cannot run two EMM's at the same time. In
this case, an Intel memory board can only work with its own Expanded
Memory Manager.
Hardware Independent
There are some third party EMM software that converts extended memory
into expanded memory. Since there are no real compatibility issues with
having more than one vendor's extended memory card in a computer, it is
possible to have boards from 2 different vendors providing extended
memory in a computer, and then have a third party software vendor
convert both boards into expanded memory. On Intel386 microprocessor-
based computers this is very quick and very straightforward, with
software packages such as Quarterdeck's QEMM386 and Qualitas' Blue MAX
being well known examples of this. On 80286-based computers the process
is remarkably slow. The processors on 8088- and 8086-based computers
cannot address extended memory, so this is not an option on those
systems.
AST 6PAK+
Compatible with current Above Boards, as well as the discontined AB
286, AB PS/286, ABPC, and ABPS/PC.
AST MEGAPLUS
*FIELD REPORTS* of compatibility with Above Boards.
Customers who have chosen to disable the memory on AST Megaplus boards
have provided the following switch settings to do so:
1 - OFF
2 - ON
3 - OFF
4 - ON
5 - ON
6 - OFF
7 - OFF
8 - OFF
AST MEGAPLUS II
*FIELD REPORTS* of compatibility with current Above Boards, as well as
the discontinued AB 286, AB PS/286, ABPC, and ABPS/PC.
Some customers have chosen to disable the memory on this board and have
provided the following two options for switches S1-S4:
all OFF, or OFF ON OFF ON.
NOTE that this board is not designed to have this capability, but one
of these switch settings might work.
AST FASTRAM
Conditionally compatible with Above Boards and the Matched Memory
Classic.
SOFTSET gives "Conflicting board" error message when trying to operate
with an AST FastRAM board installed. It is necessary to manually
install the Expanded Memory Manager software. The board cannot be
pulled out because it supplies conventional memory. This board uses
the same I/O address range as Above Boards and Matched Memory Classic:
208, 218, 258, 268, 2A8, 2B8 and 2E8, set by jumpers. The default I/O
address is 218 for the first board and 258 for the second.
AT&T MEMORY EXPANSION BOARD
Compatible with current Above Boards as well as the discontinued AB
286, AB PS/286, ABPC, and ABPS/PC.
COMPAQ MEMORY EXPANSION BOARD (AT)
Compatible with current Above Boards as well as the discontined AB 286,
AB PS/ 286, ABAT, and ABPS/AT.
COMPAQ MEMORY EXPANSION BOARD (PC)
Compatible with current Above Boards as well as the discontinued AB
286, AB PS/286, ABPC, and ABPS/PC.
IBM MEMORY EXPANSION BOARD (AT)
Compatible with current Above Boards, as well as the discontinued AB
286, AB PS/286, ABAT, and ABPS/AT.
IBM MEMORY EXPANSION BOARD (PC)
Compatible with current Above Boards as well as with the discontinued
AB 286, AB PS/286, ABPC, and ABPS/PC.
IBM XMA BOARD
Compatible with ABs.
This board is used ONLY in 3270PC and AT systems. It pages its memory
down into the open blocks at the top of CONVENTIONAL memory using 4K
page frames. By paging the XMA memory into conventional memory, the
system can use more than 640K for DOS sessions under the 3270 control
program.
For example: If you have an XMA board with 256K in an IBM AT with 512K
on the motherboard, the XMA's 256K of memory would page into the open
128K block between 512K and 640K. The system would count to 640K, but
it would actually be able to use an additional 128K by paging memory
off the XMA board. If the system is a PC with 64K, the XMA can page
all the way down to 64K! It just pages on top of whatever amount of
conventional memory the system has.
The board allows 3270 PC's and AT's to have up to 4 small DOS sessions
running in addition to their 3270 session. (Normal 3270's can have
only 2 DOS sessions.) It will not interfere with the AB's page frame
because it pages into conventional memory.
INTEL MEMORY BOARD NOTES
CONVENTIONAL MEMORY AND INTEL MEMORY BOARDS
There is a maximum of 640k of conventional memory that most systems can
recognize, (the original BIOS in the IBM PC-1 systems could only
address 544k of conventional memory, while some computer vendors could
get their systems to recognize 768k of conventional memory by re-
mapping where the video BIOS was supposed to be.)
Over the years, different Intel Memory Boards could supply different
addresses for conventional memory. The following is a list of which
Intel Memory Board could supply which memory Addresses:
Intel Memory Board Conventional memory addresses
------------------ -----------------------------
Above Board PC* .........256-640, 320-640, 384-640, 448-640
512-640, 576-640
Above Board PS/PC* ......256-640, 512-640
Above Board AT* .........512-640
Above Board PS/AT * .....512-640
Above Board 286* ........256-512, 256-640, 512-640
Above Board Plus ........256-512, 256-640, 512-640
Above Board Plus 8 ......256-512, 256-640, 512-640
Matched Memory Classic ..256-512, 256-640, 512-640
Above Board ISA .........128-640, 256-640, 384-640, 512-640
The following is a list of which Intel Memory boards are compatible
when supplying Conventional (or Base) Memory:
in 8-bit systems in 16-bit systems
---------------- -----------------
Above Board ISA Above Board ISA
Above Board Plus 8 Above Board Plus 8
Above Board Plus Above Board Plus
Matched Memory Classic Matched Memory Classic
Above Board 286* Above Board 286*
Above Board PC* Above Board AT*
Above Board PS/PC* Above Board PS/AT*
* Discontinued memory boards.
EXTENDED MEMORY AND INTEL MEMORY BOARDS 1332.20 07-01-92 CLIFFLU
Extended Memory and Intel Memory Boards
Extended memory is memory in the range starting at the 1024 address in
80286-based computers (or newer).
There is an upper limit of 16,256k of extended memory that a 16-bit
memory card can address,(16,256k is 128k short of 16M-bytes, the reason
these boards won't allow themselves to address all the way to the 16M-
byte address is that the area from 16,256k to 16,384k is reserved in
16-bit systems for a BIOS extension). Even if you were to put a 16-bit
memory board into a 32-bit system (which can address up to 4Gigabytes),
the 16-bit address lines on 16-bit memory boards can still only address
up to 16,256k. This means the total amount of extended memory a 16-bit
card can provide in 80286-based systems, (or newer) is 14.875M-bytes,
(extended memory starts at the 1,024k and ends at 16,256k which is
15,232k or 14.875M-bytes).
Over the years different Intel Memory Boards could supply different
addresses for extended memory. The following is a list of which Intel
Memory Board could supply which memory addresses:
Extended Top
Address Extended
Intel Memory Board Boundaries Address
------------------ ---------- ------------
Above Board PC* .........N/A N/A
Above Board PS/PC* ......N/A N/A
Above Board AT* .........512k 7.5M-bytes.
Above Board PS/AT* ......512k 7.5M-bytes
Above Board 286* ........512k 15.5M-bytes
Above Board Plus ........128k 16,256k
Above Board Plus 8 ......128k 16,256k
Matched Memory Classic ..128k 16,256k
Above Board ISA .........128k 16,256k
Memory Boards that can only address extended memory on 512k boundaries
will not be able to supply extended memory in systems that have 384k of
extended memory on the system board.
The following is a list of Intel Memory boards that are compatible
supplying extended memory with each other:
in 8-bit systems in 16-bit systems
---------------- -----------------
Extended memory is Above Board ISA
not possible across Above Board Plus 8
an 8-bit data bus Above Board Plus
Matched Memory Classic
Above Board 286*
Above Board AT*
Above Board PS/AT*
* Discontinued memory boards.
EXPANDED MEMORY AND INTEL MEMORY BOARDS
With the exception of the Above Board ISA, Intel Memory cards can
share the same expanded memory manager, ie, you can have more than one
type of Intel Memory card providing expanded memory in the same system.
If your system has a mixture of Above Board ISA's and other Intel
Memory boards, expanded memory can be supplied by ONLY the Above Board
ISA's OR by the other Intel memory board's, but not by both. The Above
Board ISA expanded memory manager is VERY different from the expanded
memory manager of other Intel memory boards.
The following is a list of Intel Memory boards that are compatible
sharing an Expanded Memory Manager:
in 8-bit systems in 16-bit systems
---------------- -----------------
Above Board Plus 8 Above Board Plus 8
Above Board Plus Above Board Plus
Matched Memory Classic Matched Memory Classic
Above Board 286* Above Board 286*
Above Board PC* Above Board AT*
Above Board PS/PC* Above Board PS/AT*
* Discontinued memory boards.
JRAM BY TALLTREE
*FIELD REPORTS* of conditional compatibility with Above Boards. The
JRAM memory board was made before LIM 4.0. There's a device driver in
the config.sys file for JRAM which is incompatible with EMM.sys and AB
because no two memory managers can be in the system at the same time.
The Above Board should be able to provide extended memory in a computer
that has a JRAM board.
MONOLITHIC SYSTEMS
*FIELD REPORTS* that this 8 megabyte memory expansion board works as
extended memory with ABs. There are switches on the board to indicate
extended memory start addresses and memory amounts.
PROFIT SYSTEMS AT POWER BOARD
Compatible with ABs.
Conventional memory board for AT's. Can backfill from 128K to 384K in
an AT with less than 640K.
QUADRAM QUADBOARD
Compatible with current Above Boards as well as with the discontinued
AB 286, AB PS/286, ABPC, and ABPS/PC.
QUADRAM QUADBOARD II
Compatible with current Above Boards as well as with the discontinued
AB 286, AB PS/286, ABPC, and ABPS/PC.
QUADBOARD AND QUIKBUF2
The Quadboard parallel port conflicts with the Intel Quikbuf2 print
buffer. Quikbuf2 will not work if a Quadboard is present in a system.
This is true even if Quikbuf2 is printing through another parallel
port.
{we don't understand why, but we have verified this with two different
customers.}
Quadram has an expanded memory print buffer that does work with their
port and our EMM.
STB SYSTEMS GRANDE BYTE MEMORY BOARD
*FIELD REPORTS* of LIMITED compatibility wih current Above Boards and
this memory board. This board comes with Ramdisk and Print buffer
software that works in extended memory. However if you install their
device driver our EMM.sys driver will not work.
══════════════════════════════════════════════════════════════════════════════
End of file Intel FaxBack # 1332 August 13,1992
