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Re: Using the AppleColor display for Raspberry Pi output [message #275805 is a reply to message #275803] Tue, 16 December 2014 14:53 Go to previous messageGo to previous message
scott is currently offline  scott
Messages: 3639
Registered: February 2012
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In article <31b7c5fb-8f98-449c-9f56-bea81d23b906@googlegroups.com>,
<ajross.nz@gmail.com> wrote:
> As you can see in the photo
> (http://apple2.aliross.co.uk/photos/2e/IMG_6092.JPG) it's an Apple IIe
> International NTSC variant.
>
> How to set the Pi to 50hz/625 lines timing is the next challenge! I
> don't see where you can adjust that sort of thing, certainly it doesn't
> seem to be in any of the arguments available for /boot/config.txt.

....and it's all clear now.

Hadn't heard of that variant...thought there were just NTSC and PAL
motherboards. I tried googling "Apple IIe international NTSC" and found
this:

http://comp.sys.apple2.narkive.com/uyOi7vAj/international-nt sc-apple-iie-motherboard

> This was the final revision Apple IIe board as used in the platinum IIe's
> shipped internationally. Functionally, it's much the same as its
> predecessor international board; has the aux slot inline with slot 3, has
> the charset switch, runs at 50hz refresh instead of 60hz. Platinum boards
> also have the 'shift key mod' installed (so pressing shift triggers PB2)
> and have superfluous circuitry in the game connector, and can lock up if
> you accidentally press a button on an attached joystick and one of the
> apple keys at the same time.

Sounds like your computer produces a 50-Hz variant of NTSC (NTSC 4.43?).
The Raspberry Pi can't do that, so you're not going to get color video on
your monitor from it.

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