XBR2D96D@DDATHD21.BITNET (Knobi der Rechnerschrat) (11/29/88)
Hello Netlanders,
I've got two problems:
1) This was sent by a colleague of mine some weeks ago and never
answered. We want to create a filesystem on the 1/4" cartridge
tape and mount it into our system (3130 or 4D/70G). The questions
are: a) is it possible at all? and
b) if (answer_a == yes) How to do it ???
Please don't send comments on how silly it is to attempt such
a task. We just have reasons (even if it's pure curiosity).
2) I want to contribute to the videotaping debate on this list. We
have the following scenario: a 4D/70GT without GENLOCK device,
a RGBS -> composite-video converter, a UMATIC-low-band recorder
recognizing PAL (European Video Standard) signals. Now we see
some problems:
- on the GT we have a colour shift from the left to the right of the
screen. I suspect this is a subcarrier problem. Due to the lack of
a GENLOCK for the GT I can't adjust that with my equipment (we can
correct it with our recorder, but then every other signal gets
recorded with a shift). On a 4D/70G (also without GENLOCK) everything
works ok. So, what are the differences between the G and GT style
PAL signals ?
- Our second problem is a bit harder for us. We have an animation
program that displays a scene in front of a goraud shaded background.
The color-map for the background is 256-entries deep and nonlinear
build (thats not so important). During the animation we have a
sequence of 200 frames where we change the complete background
color map for every frame (that might be clumsy, but thats the
way it was done: quick, dirty and it works fine). With the 60HZ
screen we have no problems, everything is fine. Now we change to
setmonitor(PAL). As soon as we arrive at the scene changing the
background, our problems start. The color map is simply inccorrectly
changed (which we can check by using 'showmap'). It seems that
changing color-maps in PAL mode takes a VERY long time. Is that
observation correct and are there any chances to get that changed?
3) A third problem related to color-maps: On the G and GT machines
loading color-maps seems to be slow (even in HZ60-mode). Again,
is that observation correct, and are there any plans to change
that?
Regards
Martin Knoblauch
TH-Darmstadt
Dept. Physical Chemistry 1
Petersenstrasse 20
D-6100 Darmstadt
West-Germany
BITNET: <XBR2D96D@DDATHD21>markb@denali (11/30/88)
In article <8811290154.aa16495@SMOKE.BRL.MIL>, XBR2D96D@DDATHD21.BITNET (Knobi der Rechnerschrat) writes: > Hello Netlanders, > > I've got two problems: > > 1) This was sent by a colleague of mine some weeks ago and never > answered. We want to create a filesystem on the 1/4" cartridge > tape and mount it into our system (3130 or 4D/70G). The questions > are: a) is it possible at all? and > b) if (answer_a == yes) How to do it ??? > Regards > Martin Knoblauch > > TH-Darmstadt > Dept. Physical Chemistry 1 > Petersenstrasse 20 > D-6100 Darmstadt > West-Germany > > BITNET: <XBR2D96D@DDATHD21> Just reading the man page for mounting a tape as a filesystem. Have not actually tried this myself, but know of no reason why this should not work. By the way, here is an excerpt that may help: -r Mount the specified filesystem read-only. This is shorthand for: mount -o ro fsname dir Physically write-protected and magnetic tape filesys- tms must be mounted read-only, or errors occur when access times are updated, whether or not any explicit write is attempted. markb Mark Bradley "Faster, faster, until the thrill of IO Subsystems speed overcomes the fear of death." Silicon Graphics Computer Systems Mountain View, CA ---Hunter S. Thompson