Zip GSX - Extra Components

[Polymorph <polymorph69@hotmail.com>]

Hi Guys,

I've been watching an auction on eBay for a 14MHz Zip GSX, and seeing
the photo's with the additional components (extra capacitors,
resistors and what looks like a transistor?) got me to wondering what
these additional components are for.

I modded my Zip GSX a couple of years ago to run at 12.5MHz, and am
curious as to whether these additional components are needed for
higher speeds on a Zips GSX? If not, what are they for? Most pictures
I've seen of the Zip GSX don't have these components installed,
however, I have seen more than one picture with them.

Can anyone shed some light on what the additional components might be
for? Is it recommended to add these components to a Zip GSX that
doesn't have them? Can anyone list exactly what the additional
components are? (The specific components I'm referring to are at C16,
C17, C19, C21, R7, R8, & Q2).

I haven't performed the logic chip upgrade as yet (from 'F' series
chips to 'Q' series) either - I understand that this is critical to
hit the higher speeds. But what role does the other components play?

Thanks for any info.

Cheers,
Mike