[Coco] RGB to S-Video adapter Coco 3

John Kowalski sock at axess.com
Wed May 24 20:04:56 EDT 2006

Hi Fedor,

All it would require to convert the RGB-to-Svideo circuit to output PAL
instead of NTSC would be to replace the 3.579545 Mhz crystal with a 4.433619
Mhz one, cut the trace going to pin 1 of the AD724 chip and then rewire pin
1 to ground.

I can't say Chris would do it, because I'm not him - but I'm 99% sure this
modification would just work the first time without having to send it back
for an adjustment.

At 08:45 PM 24/05/2006 +0200, CoCoList for Color Computer Enthusiasts wrote:
>Hi Chris,
>Thanks. Would that mean, in theory, that one can take a CoCo3 that normally
>sends an NTSC signal through its antenna cable and composite video outputs,
>hook up the adapter to the RGB output and have the screen displayed on a PAL
>I think I would be interested in this even if it would mean having to send
>it back and forth a couple of times. What do you think?
>On 23/05/06, Christopher Hawks <chawks at dls.net> wrote:
>> Fedor Steeman wrote:
>> > What's this thing about a RGB to S-Video adapter for the Coco 3? Where
>> > can I
>> > get it? Does it work on PAL teevees too?
>> Fedor:
>>         Sock Master (John Kowalski) posted a message (way back, 13 Dec
>> 2005 ??)
>> about pulling S-Video from the RGB-to-PAL daughterboard. I _could_ build
>> the RGB to S-Video adapter for PAL (simple changes to the circuit), but,
>> have no way to test it.
>> --
>> Christopher R. Hawks
>> HAWKSoft
>> ---------------------------------------------------------
>> DOS: n., A small annoying boot virus that causes random spontaneous system
>>       crashes, usually just before saving a massive project.  Easily
>> cured by
>>       UNIX.  See also MS-DOS, IBM-DOS, DR-DOS.
>>         -- David Vicker's .plan

                                         John Kowalski (Sock Master)

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