BETTER AGA BANDING FIX !!
Jeff Barr
!! to ALL:
SC>Just open up the 23-15 pin monitor adaptor and solder a
SC>100 ohm resistor between pin 15 and ground. THAT'S IT !!!
SC>It removes the bands completely, and you don't need to
SC>open your machine. Also it means you can still use a
SC>genlock.
How can it do that, since there is no signal on pin 15 which is used by any
monitor? It wouldn't seem that it would do anything to the video since the
monitor ISN'T reading pin 15...
The Video Toaster, only AMIGA makes it possible!
** MS QWiK v4.3 [UNREG] for Amiga **
Mark Stuart
Jeff Barr <Jeff...@f508.n278.z1.fidonet.org> wrote:
> On 03-16-94, STEVE CUTTING wandered in mumbling about BETTER AGA BANDING FIX
> !! to ALL:
> SC>Just open up the 23-15 pin monitor adaptor and solder a
> SC>100 ohm resistor between pin 15 and ground. THAT'S IT !!!
>
> SC>It removes the bands completely, and you don't need to
> SC>open your machine. Also it means you can still use a
> SC>genlock.
>
> How can it do that, since there is no signal on pin 15 which is used by any
> monitor? It wouldn't seem that it would do anything to the video since the
> monitor ISN'T reading pin 15...
Good question. However, I tried it yesterday, it works.
Mark Stuart
Alejandro Garza Gonzalez
an A1200??? I heard that these were incompatible, and have experienced
very frequent GURUs and memory fragmentation (!) when using this
setup.
-Alejandro Garza
aga...@academ04.mty.itesm.mx
hnrsa...@kuhub.cc.ukans.edu
Now is that pin 15 (C1 - clock out) to the GNDRTN (digital ground - pin 13) or
the normal video grounds (pins 16-20)? Which pin did you hook it to?
thanks
>
> Mark Stuart
>
>
Phantom Lord
>Now is that pin 15 (C1 - clock out) to the GNDRTN (digital ground - pin 13) or
>the normal video grounds (pins 16-20)? Which pin did you hook it to?
DO NOT use pins 16-20, these are analog grounds.
I used pin 13 (digital ground), and it worked great for me.
The original poster used shield ground (the outside of the db-23 connector).
Tom Kennedy
Richard Jones
cable that contains wires. YES WIRES! None of these 74LS08 thingies or 100 ohm
resistors. All I did was connect up the R,G,B,/CSYNC and ground lines and
voila! it worked. Unfortunately, it was made to go between my Amiga and a DB9
to DB15 converter to plug into a multisync monitor (brand name forgotten), and
the gender is female, not male as is the case with most monitors with DB9
connectors.
Why is there a need to generate the /CSYNC signal on the outside of a
computer that already generates it? Why aren't all the ground lines connected?
Oh, BTW, I recently bought a Multisync II, and it uses a male DB9 cable,
hence I have to use the cable they supplied with it. Well, much to my
chagrin, I have banding in low-res, and inside the little connector is a
bloody 74LS08 (what's the delay in a 74LS08 anyway? about 10-20ns?), with a
total of one ground line connected.
Where's this leading? I don't know.
Richard.
ps. I'm going to hack up a new cable as soon as I can find another DB23. Do
you know how hard it can be to find them sometimes?
--
Richard Jones, ric...@rdt.monash.edu.au (B.Comp Dig Tech (Hons) graduate)
r...@BoM.gov.au (Bureau of Meteorology, Central Systems Support)
Steve Cutting
: On 03-16-94, STEVE CUTTING wandered in mumbling about BETTER AGA BANDING FIX
: !! to ALL:
: SC>Just open up the 23-15 pin monitor adaptor and solder a
: SC>100 ohm resistor between pin 15 and ground. THAT'S IT !!!
: SC>It removes the bands completely, and you don't need to
: SC>open your machine. Also it means you can still use a
: SC>genlock.
: How can it do that, since there is no signal on pin 15 which is used by any
: monitor? It wouldn't seem that it would do anything to the video since the
: monitor ISN'T reading pin 15...
Pin 15 is a clock output signal that is used for genlocks. It isn't
used for monitors but it interferes with the RGB lines, this is
what causes the vertical bands. The fix removes this clock signal
by shorting it to ground via a resistor.
Steve :-)
Oeyvin Eikeland
irritating vertical lines seen in dblPAL on my 1942?
>bloody 74LS08 (what's the delay in a 74LS08 anyway? about 10-
^----- What's this for?
>ps. I'm going to hack up a new cable as soon as I can find another DB23. Do
>you know how hard it can be to find them sometimes?
No problem, take a 25 pin d-sub and saw off the end. Just insert the
saw in two holes at the end.
If all else fails, how about inserting a card in the video-slot with
all signals except the dreaded clk signal connected? This should remove the
banding AND the ugly silver plastic thingy that sits between the monitor and
the computer. The 4000 would also be shorter, sexier, and everybody will
think that you have a graphics card. Stupid idea...
Have anybody noticed that the pins for a complete paralell port is
made available on the new AGA video slot? What is this? Is it another
paralell port? Is it the same as the external one, or have I just found the
answer to my dreams? I could then have amitcp on one of the paralell ports,
and a printer on the other. I could also put the paralell port on the card
with the banding-fixer :) + I could add another monitor on the other monitor
output. ramble ramble ramble stop.
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