Philips G7000

From: PDP11 Hacker ..... <ard_at_siva.bris.ac.uk>
Date: Thu Aug 14 15:42:40 1997

> Well, finding a composite video point is trivial, therefore.
>
>Inside the modulator can, I fear.
>
>I had another look inside last night. The two metal cans appear to be
>video circuitry (on motherboard) and modulator (separate). They are
>linked by a 4-way ribbon cable of which one conductor is ground. I
>suspect the remaining three of being video, line sync and frame sync.
>(They could, I suppose, be composite mono, U and V but I doubt it)

Assuming that there are no other connections to the 'Modulator' then one of
those wires has to be a power rail. I'd guess (without seeing the device or the
service manual) that the other 2 were luminance (Y) and (PAL-encoded)
chrominance, or possibly composite colour video and audio if it feeds audio
through to the TV.

>> >> What chips _other than the 8048_ are in this device? Is the video side
>> >> custom or does it use one of the many Philips video chipsets? (Philips
>> >> Prestel terminals tend to be stuffed with their Teletext IC's, for
>> >> example...)

>Pretty boring, I'm afraid - 8245 and 6110 plus about 20 TTL chips. I

What the heck are those?

>can't read the numbers of the chips inside the video can unless I
>desolder said can from PCB.

Well, that's what I'd have done by now...

>
>Philip.

-tony
Received on Thu Aug 14 1997 - 15:42:40 BST