Content by Helmut P. Einfalt, original HERE. Edited by Major Tom.
The MC1608C/11 is a 2 MB graphics card capable of driving fixed frequency
monitors. It is no surprise that the Cornerstone monitors of the time (1993/4)
are supported, but pretty surprisingly also the 6091 series by IBM.
I tested the card with a 6091-19. This monitor is based on a 20" Sony
Trinitron tube and supports 60 (Mode 1 and 2) or 67 Hz (Mode 3) refresh rates
at 1280x1024. The monitor has a built-in signal amplifier that allows attaching
a second 6091-19 via the five BNC out plugs.
Originally, IBM created the 6091-19 to be driven by the ImageAdapter /A (and
later the 6091-19i and the Image-I-Adapter, the latter offering more ISA
standard refresh rates). Since there are no drivers for the IA/A and IA/I
Adapters beyond Win311 and as yet no driver hack is known to make them work
under Win9x, the 6091-19 (and the corresponding 19i) suffer from lack of
capable graphics cards.
While there are several brands of ISA/PCI/AGP cards capable of delivering
the necessary frequency ranges, the MCA community was restricted to the use of
the ATI Mach32 or the Matrox MGA adapters, both of which are fairly rare and
are said to call for some tweaking.
To my great surprise, Cornerstone's ImageAccel 1 series has native support
for the 6091 series built in. Selecting the monitor is done via a set of
jumpers in the JP1 position of the card (top right corner). Refer to the table
below for the appropriate jumper settings.
Color 19 1
Color 20/70 2
Color 21/76 3
1 Not supported for ImageAccel 1280 controller
2 ImageAccel 1600/70 and 1600/76 controllers only
3 ImageAccel 1600/76 controller only
Installing the card is a pretty straightforward matter, in fact if you
install it onto a working NT system, you'll be through the whole procedure in
half an hour.
I've installed and tested the card in a 9595-ALF (486DX-2/50) with 64 MB of
RAM, but other machines would do as well.
Step one: Before installing the card in the AVE slot (slot 7 -- the only one
it will fit), download the ADF @80A6.ADF.
(or any other source; there is *no* ADF download at Cornerstone's).
Step two: Adjust the jumper settings at JP1 to match your 6091 monitor (see
Step three: Provide a Base Video card for the ImageAccel in the BVE slot
(slot 5). Since one of the readmes around states something about known problems
with IBM's XGA and XGA/2 adapters I decided to plug in the short SVGA card that
is of no use anyway...
Attach a monitor to the SVGA card, plug in the the ImageAccel (slot 7!) and
attach the 6091-19 to the card. The 6091-19 should be set to mode 3 (i.e., to
67 Hz refresh).
(BTW, beware of any attempt to run the ImageAccel as standalone-card.
Although I found some documentation somewhere saying that it *can* provide base
VGA, this would require an option disk that no one has ever seen. The best I
could get the card to do was to fill the 6091 screen with a nice huge red
square -- optically pretty, but of somewhat limited use for configuring the
Step four: Fire up the engine. When the 165 error comes up, run automatic
configuration, feed in the ADF(s) for the video card(s), reboot and -- presto:
you'll have the nice surprise of seeing the following message at bootup on
*both* the screens attached:
Settings for the ImageAccel Display:
Primary or Secondary Adapter <Primary><Secondary>
I/O base address: <2000><2010><4000><4010>
Memory base segment address: <0C0000><0CA000><0CC000><0CE000>
Interrupt Selection: <IRQ3><IRQ5><IRQ10><IRQ11>
The settings are not critical as long as they don't conflict with other
settings. For the IRQ I chose 5, but that depends on the rest of the machine's
setup. If you select the standard of <Primary> for the video adapter,
you'll see all DOS based messages on the 6091. <Secondary> means that you
use the ImageAccel only for HiRes output (which would require another monitor
attached permanently to the BVA).
If everything is ok, the next boot brings up the following screen message
"ImageAccel MC1608C/11" plus a long serial number, and
"MEM: C000, I/O: 2000, 6091-19"
Unless you've already a running installation, install WinNT 4.0 (workstation
in my case).
Keeping the control monitor attached to the BVA during installation is a
There are two weird things you might notice:
(1) The DOS (text) based screen does *not* fill the whole of the 6091's
(2) once you've got past the basic DOS/text-based installation sequence of
NT, i.e., when NT pulls up the blue graphic background, you'll see everything
blue in RED. My IBM 15X monitor that was attached to the SVGA did behave
Cure: none for (1), and swap the R and B BNC plugs at the monitor for
Once NT is up and running **in 16-color VGA mode** (standard driver for
vga-compatible graphics card), it is time to feed it the ImageAccel NT 4.0
You'll find them here or at the
Take the ImageAccel 1 NT 4.0 drivers and download **NT40_100.zip** to your
Make a directory called NT40 and extract the files into that one. Format a
1.44 floppy and *copy the whole directory* onto it. The reason for this move is
that the unzipped driver directory contains only 1.2 MB of data, but some 140
files, and that you can't get into a floppy's root directory. (Don't kick me
for this statement of the obvious -- it took me over an hour and a couple of
formats and re-formats of at least three floppies on three different machines
before I found out why the heck 1.2 MB won't fit on 1.44 MB of free space --
neither NT nor Win95 are very helpful with their error messages in this
The next step is easy -- easier than reading the following instructions that
I copied from the IA readme:
"If the ImageAccel Windows NT 4.0 display driver is being installed for
the first time, you must first start Windows NT in VGA (640x480) mode before
proceeding. If an update installation without a display/adapter configuration
change is being performed, it is not necessary to revert back to VGA before
installing the display driver. If the display/adapter configuration is changing
and an update installation is being performed, we recommend that you first
uninstall the existing ImageAccel display driver before proceeding.
1. Right click on the desktop and pick "Properties" to bring up the
Display Properties window. Choose the "Settings" tab.
2. Select the "Display Type" button. A display type dialog box will
appear. Select the "Change..." button in the "Adapter Type" section of the
3. A "Change Display" dialog box will open. Select the "Have Disk..."
button. A box will appear indicating the drive where the Manufacturer's
information is located. Select "OK" or change to the drive letter and path
where the ImageAccel NT release resides.
4. A list of ImageAccel displays picks will appear. Select the
appropriate controller with display or timing and press the "OK" button. The
system will inform you that it will be changing its configuration. Click
5. The operating system will inform you the display settings have been
changed and that for the changes to take effect, Windows NT should be
restarted. You can restart the system at that time or later, depending on your
NOTE: Selecting an inappropriate display type may distort the screen or
bring up the VGA display driver instead. If this occurs, simply reinstall the
correct display if the display can be read, otherwise, select the VGA display
from the boot menu upon powering up the system.
6. Restart Windows NT.
NOTE: After restarting Windows NT, a Windows NT "Invalid Display
Settings" dialog box will appear with the following information: "A new
graphics driver has been installed. The old default display resolution has been
temporarily used by the system. Use the display option in the Windows NT
Control Panel to select your preferred Display Resolution." This message is a
misleading message generated by the operating system. Select OK to ignore the
message and continue.
7.Choose your desired settings through the Windows NT Display Properties
"Settings" and "ImageAccel" Pages. Some changes to the Control Panel default
settings require you to restart Windows before the changes take effect.
NOTE: (...) Network NT Installation is not supported. "
While the machine is re-starting after step 7, you'll notice that the screen
goes back to normal again, or, if you *did* swap the R for the B BNC-plug, it
will come up with a **red** startup screen. Simply change the plugs again, and
there you are... From now on, the second monitor attached to the SVGA will stop
displaying as soon as the blue start screen comes up -- but then -- who needs a
lowly 15-incher if he can have the 6091-19 ?
One more funny thing: the ImageAccel driver provides cursor color settings
-- don't be scared if you cursor comes up in a bright yellow -- there is
nothing wrong with it. Just change the settings in the Display Properties >
ImageAccel menu (and reboot once more...).
And there we are: As far as the ImageAccel is concerned, installation is as
easy as anything. And you end up with a wonderful combo of a working NT on a
9595 and a nice huuge display.
Now, if Cornerstone *just* could make an upgrade kit to 4 MB (and true
Thanks to Ulrich Trunk for donating the card that revived the 6091-19.