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Re: Apple //e RGB Card to CGA pinout?



"Ed Eastman" <noone@nowhere.net> wrote in message 
news:dfpv83$3sd$1@unlnews.unl.edu...
>> Well, you can't just attach the sync signal to the green,
>> it has to be incorporated digitally.
>
> Use an 1881 to get your sync signals back...
LM1881 'Video Sync Separator' seems to be a very useful ic there if I really 
need it.

After thinking a bit more about the mitsubishi monitor
from my own post:
> I then made a quick adapter for the mitsubishi monitor without the 
> resistors to display "8 colors". It wasn't a success either. The picture 
> was stable but the screen was garbeled. It seemed to me that horizotal 
> sync wasn't working, that the lines were too long or too short. making 
> each scanline not in sync with the next. Either there is a problem with 
> the levels or the monitor might be broken (I will open it and see if there 
> is anything to adjust.
and rereading the Marco Orlandi's document I probably need to change the 
level of the sync signal. He cuts a resistor, I probably need to do that.

As is I have no real documentation for the RGB card, couldn't find anything 
on the net either. There is the little dipswitch with two switches and a 
jumper. I notice that the dispswitches are differently set than Marco 
Orlandi have them. The jumper is open/empty. Does anyone know what these do?

Knut