20 Apr
2019
20 Apr
'19
5:33 p.m.
I am fashioning an RGB cable from parts. The computer (LNW80) does not
send an "intensity" signal, it is only a 6pin rgb. The magnavox rgb 80
display that I wish to use to receive has a pin for an intensity signal.
Other than "intensity" the rgb signals can be matched up.
Question...what happens when a computer does not send an intensity signal
to a display that has this input? I will find out soon enough but I am
curious to ask before I begin should anyone have a suggestion. Do I need
to add a resistor off of ground or something to fix it to something?
Bill
20 Apr
20 Apr
6:20 p.m.
I'm not sure what needs to be done but almost sure a resistor to ground is not likely
to be the answer. Give it a try without it first.
Dwight
________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Bill Degnan via cctalk
<cctalk at classiccmp.org>
Sent: Saturday, April 20, 2019 5:33 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Rgb intensity line
I am fashioning an RGB cable from parts. The computer (LNW80) does not
send an "intensity" signal, it is only a 6pin rgb. The magnavox rgb 80
display that I wish to use to receive has a pin for an intensity signal.
Other than "intensity" the rgb signals can be matched up.
Question...what happens when a computer does not send an intensity signal
to a display that has this input? I will find out soon enough but I am
curious to ask before I begin should anyone have a suggestion. Do I need
to add a resistor off of ground or something to fix it to something?
Bill
10:31 p.m.
On Sun, Apr 21, 2019 at 1:33 AM Bill Degnan via cctalk
<cctalk at classiccmp.org> wrote:
I am fashioning an RGB cable from parts. The computer (LNW80) does not
send an "intensity" signal, it is only a 6pin rgb. The magnavox rgb 80
display that I wish to use to receive has a pin for an intensity signal.
Other than "intensity" the rgb signals can be matched up.
Question...what happens when a computer does not send an intensity signal
to a display that has this input? I will find out soon enough but I am
curious to ask before I begin should anyone have a suggestion. Do I need
to add a resistor off of ground or something to fix it to something?
Assuming it's a TTL level RGB interface (which given the intensity line it
almost certainly is), I think there are several things you could do with that
intensity line. All will give a display but it will be different, so
pick the one you
like...
1) Tie it low (so you always get the unintensified colours)
2) Tie it to +5V (preferably through a 1k resistor) (so you alway get the
intensified colours).
3) Connect it to one of the 'colour' signals. If you connect it to the G
signal for example, then any colour with green in it will be intensified.
4) Connect it to a logical combinaton of the colour signals. If you
connect it to the logical AND of R,G,B then white will be intensified
all others not. If you connect it to the logical OR of R,G,B then black
will be the only unintensified colour. This involves extra logic circuitry
and is probably not worth doing, but I include it for completeness.
-tony
Bill
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