Re: Apple IIgs RBG -> Amiga 1080 monitor

[vector <abuse@aol.com>]

dcp490NOSPAM@yahoo.com (Dan) wrote in news:27345b77.0302211413.1de44ae4
@posting.google.com:

> Hello all.
> I have a Commodore 1080 monitor and an Apple IIgs. I was wondering if
> is was
> possible to hook up the IIgs to the 1080. It seems possible as they
> both use 15Khz scan frequency. Does anyone have the pinouts for a
> cable?
> Thanks,
> Dan
> --
> Remove the 'NOSPAM' to reply

The C-1080 is a DB-23 connector, nicht?  (Leave me alone, old skool 
electronics people.  The "DB" naming convention won out for standard 
usage.  If Radio Shack doesn't make a distinction between DB, DE and 
whatever other styles, I don't have to either.)  I think the cable should 
be wired as follows:

DB-23        DB-15
pin 3 ------ pin 2  (analog red)
pin 4 ------ pin 5  (analog green)
pin 5 ------ pin 9  (analog blue)
pin 10 ----- pin 3  (composite sync)

pin 16 ----- pin 1  (ground, red?)
pin 17 ----- pin 6  (ground, green?)
pin 18 ----- pin 13 (ground, blue?)

It's the Amiga side I'm not sure about.  In all the pinouts I've seen for 
Amiga 23-pin video connectors, pins 16-20 are only labelled "ground", 
never "red ground", etc, whereas they're explicitly labelled in the IIgs 
pinouts.  

I was looking into all this to evaluate whether an Amiga scan doubler 
could be used on a IIgs.  Software Hut has told me that a hardware 
redesign would be needed to make the ToastScan work in such a 
configuration, but I think that was said more because they weren't 
familiary with IIgs video and didn't care to be, either.  I still believe 
it would be possible out-of-the-box, given the proper adapter and/or 
cable.  If you're an Amiga guy and have a scan doubler laying around and 
then get around to building this cable, pretty please with et cetera on 
top let us all know how that works out for you.  There's been talk of 
using the Amiga scan doublers for a long time, and while I've never seen 
anyone offer an reason why that setup wouldn't work, I've also never seen 
anyone actually try using an Amiga scan doubler, either.

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