[Coco] A new Composite Video board for the MC-10

[Zippster]

No, they wouldn’t.  They’re very specific to US NTSC machines.
PAL machines all have additional circuitry to convert the MC6847s
NTSC compatible output to PAL (changes to # of lines/fields).

From what I’ve heard, it seems at least some PAL machines generate PAL baseband
composite before going to RF modulation, so the signal could be tapped at that
point on those systems.

On NTSC machines, the MC1372 is configured differently to produce either
a baseband signal or modulated RF, so a different board is needed.

- Ed


> On Aug 3, 2015, at 10:53 AM, Torsten Dittel <OS-9 at TRS-80.CC> wrote:
> 
> Zippster <zippster278 at ...> writes:
> 
> 
>> The boards are designed for NTSC MC-10s as RF modulator replacements.
>> They wouldn’t fit anything else AFAIK.
> 
>>> On Aug 2, 2015, at 11:34 PM, Torsten Dittel <OS-9 <at> TRS-80.CC> 
> wrote:
>>> Do you have an NTSC board? I fear it 
>>> doesn't work on European PAL board (not 
>>> even fit). If you have a French RGB board,  
>>> it doesn't make sense at all (no RF 
>>> modulator in there... 
> 
> That's what I meant (of course Ed's boards are high quality designs)...
> :-)
> 
> There were basically 3 MC-10 board types sold: The NTSC version in the US, 
> a PAL version for Europe and Australia (I know of different RF modulators 
> and PAL versions for UK, Australia and Central Europe (DE, NL, BE)) and as 
> a third variant the French RGB Version (PAL/SECAM "Peritel" RGB out, 
> AZERTY keyboard layout) which is similar or even equal to the board in the 
> Alice 4K.
> 
> I still assume your board doesn't fit in any of the PAL versions.
> 
> Regards,
> Torsten
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco