VECTORLIST - The Mailing List For The Technical Discussion of Vector-Based Arcade Games

August_1997
Re: Tailgunner has a special monitor?

From: Al Kossow ( )
Date: Mon Aug 11 1997 - 12:28:19 CDT

Zonn said:

The slight modification is a jumper(s) on the monitor that routes the +/-
15v to some unsed pins on the 8 pin socket. 

--

There is a PC layout drawing of the monitor board in the Star Castle
board (should have thought of looking at the board layout and not
just the schematic, duh..)

There is a spot for an 8 pin OP Amp just to the left of the X DAC
and it's wired up as a unity gain non-inverting amplifier. The one
thing other than installing the part you have to do is install a
jumper (or a resistor.. someone with a monitor with these parts
populated would have to tell, it's coming off of pin 2 of the 8
pin DIP).

I would guess the wire mod brought +/- 15 over to pins 7 and 4 of
the OP Amp, respectively.

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