Philips G7000 - test-drb@ccmp.vtda.org

15 Aug 1997

...
  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  
Oops!  The connection to the PSU is another ground, so I guess you must 
be right.

...
  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. 
If one is not composite video, where is the sync encoded?  On Y (i.e. 
making it composite mono)?  I suppose this could just possibly be video 
+ composite sync - just what I need.

...
  > >>
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? 
8245 is a Nat Semi keyboard controller.  This chip says Intel on it, but 
I was assuming, probably very rashly, that it was the same thing.

6110 is a typo for 6810 :-), in fact Motorola MCM6810, a RAM chip.  
Looking it up last night I discovered that it is in fact 128 by 8 (yes, 
128 bytes!) so I cannot think what it is used for!  (It is too slow to 
be a video output buffer)

Philip.