Re: Question about Midway Trog boardset

1084S has a 75 ohm input impedance, board can't handle that (no
buffering). Game monitors are usually high impedance. Pullup resistors
might help,

On Mon, Jan 28, 2013 at 7:04 PM, Matthew Rossiter <matt@rossiters.com>wrote:

> Hello Everybody,
>
> I have a quick question about a Midway Trog Boardset<http://www.arcade-museum.com/game_detail.php?game_id=10201>
> .
>
> It seems to be working fine but the screen is very dim. The logical
> response would be that it's the monitor. I'm using an Amiga 1084S Video
> Monitor and it's perfectly fine (bright and colorful) for any other game,
> so it has to be the boardset. I also tried sending the video to my other
> flat screen computer monitor using an RGB/VGA converter, but the signal
> drops out alot. So maybe it's sending out weak signals. The board
> voltages look pretty good. Pretty much +5v and +12v.
>
> The Schematic for the Video Output sections is here<http://www.arcade-museum.com/manuals-videogames/T/trog.pdf>on PDF page 55. I'm not much of an expert on Jamma boards. Any
> suggestions?
>
> Matt
>
>
>

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Received on Mon Jan 28 22:04:29 2013