ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ» º º º Classic Above Board Memory Board Compatibility º º º ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ 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. ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ End of file Intel FaxBack # 1332 August 13,1992