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Re: Using the AppleColor display for Raspberry Pi output [message #275742 is a reply to message #275650] Mon, 15 December 2014 12:26 Go to previous messageGo to previous message
scott is currently offline  scott
Messages: 3639
Registered: February 2012
Karma:
Senior Member
In article <alpine.DEB.2.02.1412141616061.4437@pi>,
Alistair Ross <ajross@gmail.com> wrote:
> I have the AppleColor Composite Monitor IIe, Model number A2M6021X which
> sits atop my //e platinum and works fairly well. Colours are still
> vibrant enough and I'm happy with it on the whole.
>
> Now, I'm located in New Zealand and I'm aware that NZ uses a variant of
> PAL to display on their TV sets, but I'm sure that this monitor is just a
> 'standard' US NTSC monitor. This said, when I plug it into the Raspberry
> Pi eveything is in mono. I thought it must just be a setting in
> /boot/config.txt so I ensured that the obvious settings like sdtv_mode=0
> and sdtv_colourburst=0 are forced. No dice.
>
> I know it's possible to get this (or at least a variant of this) monitor
> to display the Raspberry Pi composite output in colour because I watched
> David Schmenk do it in his Apple2Pi demo video.
>
> Does anyone know the secret of getting these monitors in colour when
> hooking up to a Raspberry Pi or other composite source?

There's a button on those monitors to switch color on and off so you can
make 80-column text somewhat more legible. Are you sure you've switched
color on? Also, are you sure that it's an NTSC monitor? If it needs to run
on 120V and has an American power plug, that would be a point in favor of it
being an NTSC monitor, but that'd mean you have to run it off of a step-down
transformer.

Valid options for sdtv_mode on the Raspberry Pi are as follows:

0 NTSC-M
1 NTSC-J
2 PAL
3 PAL-60

Are you getting a stable, but black-and-white image, or is it rolling
uncontrollably? If it's stable, try toggling the color switch. If it's
rolling, you probably have a PAL monitor and need to switch sdtv_mode to 2.
(3 is a 60-Hz variant of PAL, used in Brazil...it won't do what you need. 1
is the slightly different Japanese version of NTSC.)

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