'emil lam' wrote, in part:
| I've just bought a Topcon VS-10S 10" monitor from shop. Shop staff had
| shown me clearly the monitor could be displayed in 800x600 resolution
| with 30 bit color (I didn't know his PC configuration). When I
| connected the monitor to my PII PC w/ NVIDIA RIVA TNT display card, XP
| Professional & XP Home installed in 2 separate HDs, I found I could
| only get proper display with VGA mode (640x480). If I changed the
| resolution to higher values, the display immediately turned into a
| mess.
_____

The short answer:
Your monitor can not handle a refresh rate above 50 to 63 Hz for 800 X 600
resolution. Higher than that and the display will either be a mess of
misplaced scan lines, or completely missing. The monitor might also be
damaged.

The longer answer:
I looked at the small amount of information on your monitor at the URL you
posted.

Monitors don't really have 'drivers' at most there might be a file with
color information and lists of available horizontal and vertical rates.

A 10 inch CRT is not really suitable for greater resolutions than 640 X 480.
According to the information at the URL, your Topcon 10 inch can handle
horizontal rates of 30,000 Hz to 38 Hz and vertical rates of 50 to 90 Hz;
and resolutions of 640 X 480, 800 X 600, and 1024 X 768. The pitch is 0.28
mm.

The above numbers tell the tale.

Divide the horizontal frequency by the horizontal resolution and you get the
vertical resolution possible.

Taking the higher horizontal frequency given, a 800 X 600 resolution gives
only 63 Hz; taking the lower horizontal frequency gives only 50 Hz. That
means you must set the display adapter refresh rate to 63 Hz at highest, and
perhaps as low as 50 Hz to get the monitor to correctly display 800 X 600
resolution.

For 1024 X 768 the situation is even worse; the refresh rate must be set to
37 Hz or less. This means that the monitor can only display 1024 x 768 with
interlaced scan rather than progressive scan.

The 0.28 mm dot pitch tells an even uglier tale. A 10 inch CRT is 10 inches
diagonally between opposite corners; that means a horizontal line is less
than 8 inches (203 mm). Divide the physical line length by the dot pitch
and you get less than 726. Since the dot pitch is the DIAGONAL distance
between phosphor dots of the same color, the actual horizontal pitch is only
0.866 X 542 mm = 470. So you see, even if you set the refresh rate so as to
make the diplay usable at 800 X 600, the resolution of the diplay will at
best be 628, and not able to physically display 800 pixels by 600 pixels.

Basically you have a monitor useful for 640 X 480. Setting the refresh rate
of your display adapter to 60 Hz ought to give a recognizable image at 800 X
600 but not a sharp image.

I don't know why you purchased the monitor, but you probably did not get
what you thought you were buying. I would recommend taking it back and
closely questioning the 'shop staff'.

Phil Weldon


"emil_lam" wrote in message
oups.com...
| Hi,
|
| I've just bought a Topcon VS-10S 10" monitor from shop. Shop staff had
| shown me clearly the monitor could be displayed in 800x600 resolution
| with 30 bit color (I didn't know his PC configuration). When I
| connected the monitor to my PII PC w/ NVIDIA RIVA TNT display card, XP
| Professional & XP Home installed in 2 separate HDs, I found I could
| only get proper display with VGA mode (640x480). If I changed the
| resolution to higher values, the display immediately turned into a
| mess.
|
| I tried forced XP to search for Topcon's driver but I found no Topcon's
| brand name in monitor driver list.
|
| Please tell me how can I use this 10" in higher resolution ? I checked
| from below url that the best resolution for this monitor should be
| 1024x768.
|
| http://www.aures.com/ang/2_pdv/6_monit/a_vs_10s.html
|
|
|