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MEMO1156.TXT
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1992-12-02
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╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ ISA Bus: Software Compatibility: DOS 5.0 ║
║ ║
╚═════════════════════════════════════════════════════════════════════════╝
DOS 5.0 AND ABOVE BOARDS (CLASSIC BUS)
Above Boards all work well with DOS 5.0, appearing to have no
compatibility problems. However, there are some issues to be considered:
■ If you are using EMM.SYS and HIMEM.SYS, EMM.SYS should come before
HIMEM.SYS. Generally EMM.SYS should be the first driver in your
config.sys file. EMM.SYS must come before HIMEM.SYS when both are
present, because of the way HIMEM.SYS manages INT15.
■ Please use the latest version of our software, both the
drivers and utilities, such as installation software. This
software is available on our BBS and Compuserve, or you can
call and request that a disk be sent to you. If you must use
EMM 3.2, you will need to add the E parameter to your EMM.SYS
line. NOTE: THIS MEANS THE ABOVEBOARD MUST NOT PROVIDE ANY
EXTENDED MEMORY.
■ In general, installation programs for hardware and software should
be run on a "clean" system - that is, one that has been booted
from a DOS diskette without lots of drivers and TSRs loaded into
memory. Disk caches in particular (such as SMARTDRV) can cause
the loss of data when some installation programs are run. Do not
run the Above Board INSTALL program or the earlier SETUPAB while
SMARTDRV is active.
■ If your system is having problems with EXTENDED memory usage, and
specifically with HIMEM.SYS, check the README file that came with
DOS. The Above Board is fully compatible with HIMEM.SYS, but some
system motherboards implement the A20 address gate in non-standard
fashions and can either require special parameters on the
HIMEM.SYS line, or be totally incompatible with HIMEM.SYS.
DOS 5.0 is the first version of DOS to make significant use of EXTENDED
memory, and to acknowledge Upper Memory Blocks (UMBs). For that reason,
both extended and expanded memory become an issue with DOS 5.0.
■ If you are trying to use your Above Board to provide UMBs in an
8086, 8088 or 80286 system, you will need to have either an Above
Board Plus, an Above Board Plus 8, or an upgraded Above Board 286.
In addition, you will need a UMB manager program such as QRAM or
MOVE'M. Also, UMBs can not be provided in any address space that
is either being used by or reserved for other devices.
■ The Above Board Plus can map the range from C000 to EFFF on PCs or
XTs. On ATs, the Above Board Plus will not map the E000 range,
since the IBM AT has ROM sockets on the motherboard that decode at
this range, and a hardware conflict would occur that could
eventually damage either the motherboard or the Above Board. In
both PC/XT and AT systems, Above Boards will not map RAM into the
A000-BFFF address range, as this range was reserved by IBM for
video buffer.
Above Boards that can provide DOS 5.0 (HIMEM) compatible extended
memory in systems with a 286, i386, or i486 CPU:
Above Board AT
Above Board PS/AT
Above Board 286 & PS/286
Above Board Plus & Plus I/O
Above Board Plus 8 & Plus 8 I/O
Above Boards that can provide UMB support in conjunction with a UMB
utility such as MOVE'M or QRAM:
Above Board Plus or Plus I/O
Above Board Plus 8 or Plus 8 I/O
Above Board 286 or PS/286 with upgrage installed
The Above Board PC, Above Board PS, Above Board AT and Above Board PS/AT
can provide UMB support only if the user is willing to give up access to
expanded memory.
For more information, please refer to our articles on those two topics:
Upper Memory Blocks (UMBs) FaxBACK doc 1158
High Memory Area (HMA) FaxBACK doc 1250
══════════════════════════════════════════════════════════════════════════════
End of file Intel FaxBack # 1156 December 2,1992