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Software Vault: The Gold Collection
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MEMO1444.TXT
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1992-08-26
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╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ Classic Above Board Video Board Compatibility: T-Z ║
║ ║
╚═════════════════════════════════════════════════════════════════════════╝
PROBLEMS W/ZENITH EGA BOARDS AND EMM
If the customer is experiencing video problems when EMM.SYS loads, they
will probably need new Above Board software. They will need SOFTSET and
EMM versions with an Installation Diskette label date of 5/89 or later.
Some background: Zenith ships at least two different EGA boards with
their ZW-248 systems. One is made by SIGMA, the other by Paradise.
Both use the same ROM driver on the board, which makes use of a 4K
"SCRATCH PAD" area to store some information for the EGA board's
operation. Intel's old EMM and INSTALL programs were unable to detect
this "scratch pad" and caused the information to be corrupted. This
caused erratic operation of the EGA.
ZENITH EGA MODEL 449 & AB286
Customers report compatibility with Above Boards and this video card.
Tech Note: We have one customer report that the discontined INSTALL
software will work if this board's auto emulation is turned off,
otherwise it would be necessary to manually install the Expanded Memory
Manager. We have no reports of any problems with the SOFTSET program
(which replaced the INSTALL program).
(This board made by Sigma Designs)
TATUNG MODEL VGA-16
*FIELD REPORTS* of compatibility with Above Boards, although there are
some issues to be aware of when setting up expanded memory with this
VGA adapter. Extended memory works great with this adapter without any
modifications.
Since this 16bit VGA card doesn't do a true 16bit reserved memory
access (it fluctuates between 8bit and 16bit reserved memory accesses),
the VGA card needs to be set to an 8bit mode in order to work with our
Expanded Memory Manager. If it did a true 16bit access we could add the
16BIT=03 parameter to the EMM.SYS device driver line to get this
working, but this parameter will lock up the system the first time this
VGA card does an 8bit access of reserved memory.
16-bit VGA board similar to the Video 7 VGA. There is a switch for
setting the ROM to 8-bit or 16-bit. Set it to 8-bit for it to work
with AB expanded memory. Uses A0000-CA7FF.
TAXAN PX1280
*Field Reports* of compatibility with Above Boards.
This EGA video board uses address ranges: A0000 - C4FFF which could be
an issue if the Above Board is providing expanded memory.
Customer Note:If this board is used in conjuction with the Taxan
Scanner in an 80286-based computer there won't be sufficient memory for
EMM to load. Taxan scanner board uses D0000-DFFFF.
TRIDENT VGA
*Field Reports* of compatibility with Above Boards. There are two
potential conflicts when the Above Board is set up to provide expanded
(LIM EMS) memory:
■ This VGA card uses a 32k area that the Above Board can use, from
C0000 - C7FFFh.
■ This 16bit VGA doesn't do true 16bit accesses through reserved
memory, it fluctuates between 8bit accesses and 16bit accesses.
Because it doesn't do true 16bit accesses it can cause lockups with
current Above Boards providing true 16bit accesses for expanded
memory. The only solution is to be put the VGA into 8bit operation
by removing jumper J1.
VERTICOM PGA
*Customer Reports* of compatibility with Above Boards. There are two
potential conflicts when the Above Board is set up to provide expanded
(LIM EMS) memory:
■ This VGA card uses a 64k area of the 128k area that the Above Board
can use, from C0000 - CFFFFh.
■ This 16bit VGA doesn't do true 16bit accesses through reserved
memory, it fluctuates between 8bit accesses and 16bit accesses.
Because it doesn't do true 16bit accesses it can cause lockups with
current Above Boards providing true 16bit accesses for expanded
memory. The only solution is to be put the VGA into 8bit operation.
VIDEO 7
VIDEO 7 VGA FASTWRITE / VRAM
*FIELD REPORTS* of compatibility with current Above Boards. There are
two potential conflicts when the Above Board is setup to provide
expanded (LIM EMS) memory:
■ This VGA card uses a 32k area that the Above Board can use, from
C0000 - C7FFFh.
■ This 16bit VGA doesn't do true 16bit accesses through reserved
memory, it fluctuates between 8bit accesses and 16bit accesses.
Because it doesn't do true 16bit accesses it can cause lockups with
current Above Boards providing true 16bit accesses for expanded
memory. The only solution is to be put the VGA into 8bit operation
by setting Switch 6 on the VGA board to the off possition. This
disables the 16-bit ROM accesses and enables the 8-bit accesses.
The Video RAM accessing is still 16-bits. Performance degradation
of the VGA board is minimal.
The VRAM board is similar and switch 6 instructions are the same.
VEGA VGA
*Field Reports* of compatibility with Above Boards.There are two
potential conflicts when the Above Board is setup to provide expanded
(LIM EMS) memory:
■ This VGA card uses a 32k area that the Above Board can use, from
C0000 - C7FFFh.
■ A customer reported having problems with Paradox and Word Perfect
5.0 after installing an AB and EMM. Video 7 informed the customer
that the VEGA version 1.04 of software was incompatible with LIM
4.0. They have a free upgrade to a new BIOS (and some other fix
not described).
VISION TECHNOLOGIES EV620 VGA GRAPHICS ADAPTER
This is a 16-bit VGA board. We have customer reports of compatibility
with Expanded Memory (using EMM.SYS) and the EV620 when the EV620 is
set for 8-bit operations. There are no issues with this video adapter
when the Above Board or Matched Memory Classic is configured for only
extended memory.
To configure the EV620 for 8-bit operations you must set the following
switches accordingly:
SW3 OFF
SW7 OFF
SW8 ON
VGA MEMORY USAGE
Some general info:
VGA's in general use ALL of A0000 to BFFFF for video data. These guys
tend to be in EGA mode most of the time because software has to be
rewritten to use REAL VGA capabilities. There are more and more REAL
VGA applications being written daily.
VGA mode itself has several modes i.e. 640 x 480 w/sixteen colors, 320
x 200 w/256 colors (WOW the shading) and some others.
The VGA board has TWO eproms located at C0000 to C7FFF which in effect
is an extention of EGA (EGA used C0000 to C3FFF) so we can forget about
the lower half of the C0000 area for use when providing expanded (LIM
EMS) memory.
Most VGA boards occupies (not necessarily always uses) the area from
A0000 to C7FFF (160k!).
IBM 's VGA in the PS/2 machines don't occupy the C0000 to C7FFF area
because the BIOS supports it directly.
WYSE 7190 VIDEO CARD
* FIELD REPORT *
This board use 16K of switchable memory addresses. The possible
combinations are as follows:
Switches 4 5 Mem. Address
---- ---- ------------
On On CC00 - CFFF
On Off D400 - D7FF
Off On DC00 - DFFF
ZENITH
ZENITH Z449 & INSTALL AND TESTAB
*Field reports* of compatibility with Above Boards.
Tech Notes:
TESTAB and the discontined INSTALL programs aren't compatible with this
graphics board.
If a customer is trying to install the Expanded Memory Manager
(EMM.SYS) using the old INSTALL program, it won't work. They will have
to install EMM.SYS into the CONFIG.SYS file manually, or use our newer
software (SOFTSET).
══════════════════════════════════════════════════════════════════════════════
End of file Intel FaxBack # 1444 August 26,1992