Here it is (this is a copy of the email Zonn sent me about Vectrex settings):
Here's what I use:
First off, ignore the User Guide, you can run it nearly as fast as the WG6101,
so set the speed jumpers to:
On J3:
Only SP1 & 1284 installed
On J4:
Only Y-SP1 & X-SP1 installed
On J7:
Nothing installed on X-LIN & Y-LIN
(The other 2 pins are no connects, you can
use them as place holders for the jumpers)
On J8:
Only NOPIN installed
Make sure you have set the ZVGPORT environment variables to include the
parameter M29 along with the proper port settings.
The ZVGTweak settings are:
Z-Axis Shift: 50
Z-Axis Overshoot: 45
Maximum Intensity: 255
Minimum Intensity: 128
Point Intensity: 30
Screen Size: 85
Jump Speed: 35
Settling Time: 1
(Be sure to press the 'S' key to save these settings in the EEPROM.)
Then adjust the size and centering pots to fill the screen with the chopped off
logo. (And of course adj the line length pots so that the endpoints line up.)
Unfortunately the ZVGTweak menu was written for the arcade monitors, which can
handle more contrast between bright and dark vectors. When the Vectrex
brightness control is set correctly for MAME, you'll barely see the ZEKTOR logo.
So turn up the Vectrex's brightness a bit when using ZVGTweak, and then down a
bit when you go back into MAME.
The Maximum Intensity is the maximum brightness a Vector can be displayed. The
Minimum, is obviously the minimum brightness that can be displayed, but you can
think of it as a contrast control. If the minimum intensity vectors in a game
like TacScan are too dim, you can turn up the Minimum intensity a bit, oh say
160, to brighten them up a bit. Just adjust to suit your taste, and variations
in Vectrexes.
Have fun!
-Zonn