[Coco] Re: [Color Computer] composite driver for coco2?
jdaggett at gate.net
jdaggett at gate.net
Sat Mar 6 21:47:54 EST 2004
Is there circuitry connected to pin #13 and #14 of the MC1372?
If so then what you are getting out of Neil's circuit is double sideband amplitude
modualted carrier at either channel 3 or 4. You are going to need to do some
modifications to the MC1372 to generate solely composite bassband video.
1) remove all components that is connected to pins #13 and 14.
2) from Pin#14 to pin#13 wire in a 1N4001 diode or equivalent with the anode
end to pin #14 and cathode end to pin #13.
3) wire in a 360 ohm resistor from pin #14 to +5 VDC
4) wire a 3.9K ohm resitor from pin #12 to + 5VDC
5) wire in Neil's circuit.
On 6 Mar 2004 at 14:40, sadolph wrote:
To: "Neil Morrison" <neilsmorr at hotpop.com>,
<ColorComputer at yahoogroups.com>
From: "sadolph" <sadolph at magma.ca>
Date sent: Sat, 6 Mar 2004 14:40:21 -0500 (EST)
Copies to: Subject: [Coco] Re: [Color Computer] composite
driver for coco2?
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> Hi Neil, yes I saw it--I built it this morning.
> Unfortunately, after trying to get it to work and doing some reading,
> my version of the COCO2 uses the MC1372 chip as the RM modulator. I
> think the circuit on your site is for COCO1, and I suspect that there
> is a separate RF modulator in COCO1.
> So, I think I have to hack the actual 1372 circuit to make it not act
> as a combination (composite video+modulator) and make it act as simply
> composite video.
> I'm hoping someone else has gone through this in the past and has some
> thanks, Steve
> On Mar 6 , "Neil Morrison" <neilsmorr at hotpop.com> wrote:
> > Did you look on my website?
> > <a
> > href='http://coco_docs.tripod.com/id53.htm'>http://coco_docs.tripod.
> > com/id53.htm</a>
> > It only needs +5V
> > Neil
> > ----- Original Message -----
> > From: sadolph
> > All,
> > I've been trying to track down a composite monitor driver circuit
> > for coco2. I've found some circuits, but they appear to be for
> > coco1.
> > I'm wondering if anyone knows of a good circuit for coco2 color
> > composite video?
> > Thanks, Steve
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