gcwilliams@watdragon.waterloo.edu (Graeme Williams) (01/09/91)
Well having read through lots of Mode 21 discussion it occured to me
that someone might know the answer to the following problem:
I have an NEC 3D monitor which I use with both my A310 and with
a (rarely used of course!) 80386 PC. When the Arc is in Mode 21
the NEC 3D refuses to display the screen properly, namely it is
displaced by about a half screen width to one side. (The undisplayed
area actually gets wrapped around and appears on the other side of
the display). *NO* amount of fiddling with the various monitor
controls to centre the screen will alleviate the problem - they're
just not designed to move the screen much more than an 1/8 to a 1/4
of a screen sideways. Consequently I can't use Mode 21.
Question: Am I missing something? Is the NEC 3D monitor incompatible
with Mode 21? Or is my 3D monitor somehow faulty/not set
up right inside? Or last (and hopefully least!) is my A310
not performing properly?
Ideas anyone?
Graeme Williams
gcwilliams@watdragon.waterloo.edudhmyrdal@solan.unit.no (Dag H}kon Myrdal) (01/11/91)
In article <1991Jan8.214959.7587@watdragon.waterloo.edu>, gcwilliams@watdragon.waterloo.edu (Graeme Williams) writes: |> [...] When the Arc is in Mode 21 |> the NEC 3D refuses to display the screen properly, namely it is |> displaced by about a half screen width to one side. (The undisplayed |> area actually gets wrapped around and appears on the other side of |> the display). *NO* amount of fiddling with the various monitor |> controls to centre the screen will alleviate the problem - they're |> just not designed to move the screen much more than an 1/8 to a 1/4 |> of a screen sideways. Consequently I can't use Mode 21. |> |> Question: Am I missing something? Is the NEC 3D monitor incompatible |> with Mode 21? Or is my 3D monitor somehow faulty/not set |> up right inside? Or last (and hopefully least!) is my A310 |> not performing properly? When you have a faster hor. scan (ie a "higher" screen mode), the monitor will shift the start of the left-hand screen border unless the monitor has circuitry to adjust for this. You probably could get the monitor to work in mode 21, but then all modes with a lower horisontal scan freq. would look like shifted left!!! To sum it up.... Your problem is not due to a fault, but simply the Archimedes' many different screen modes. You will need a very fleksible multi-sync monitor to fully satisfy your Archimedes' capabilities... -- Dag Haakon Myrdal, student of electronics -- email: dhmyrdal@solan.unit.no (-SUN internet, Trondheim) snail: DH Myrdal, Moholt Alle 2-01, N-7035 Trondheim, Norway phone: +47 7 588244 -- About MS-DOS: "... an OS originally designed for a microprocessor that modern kitchen appliances would sneer at...." - Dave Trowbridge, _Computer Technology Review_, Aug 90