RE: Major Havoc Screen problems

Rodger,
 
    Well you have describe *almost* what is happening on the shrinking box
screen. That box is there and it sorta shrinks. It more like appears at
one size, disappears, then appears a few seconds later somewhere in the
middle of the screen (smaller) then disappears again. I see it reappear
again in the middle off the screen very small then it's gone again.
 
    Does your analysis below still fit with this behaviour? Also, when I
do try to play the game, the display is scaled as described below, but I
also experience "slow-down" and jumpy movements of my space ship (in-between
screens) and the aliens...
 
    Anyway, I'll go check those bad boys to see what I can determine. Mind
you is this a sign that the transistors are a problem or could another
component in that area be forcing Q7 on?
 
THanks
Andy

-----Original Message-----
From: Rodger Boots [mailto:rlboots@cedar-rapids.net]
Sent: September 8, 2000 17:47
To: vectorlist@synthcom.com
Subject: Re: VECTOR: Major Havoc Screen problems

Looking at the schematics I have this suggestion:

Run selftest and see if the "shrinking box" still works. If it doesn't, Q7
might be stuck on or shorted (or Q6 turning Q7 on). This would take sizing
to maximum and totally kill the analog sizing functions.
  

"Evrovski, Andrew" wrote:

Hello Folks,

        I was going through the test modes adjusting MH pots to the screen
patterns as outline in the MH docs. There were screens with colour patterns
and cross-hatches etc and I followed the instructions for making
adjustments.

        At one point there is a screen with a red box around the screen and
then a white box just within and then another box (looked green although
manual said it should be white) that starts outside and shrinks smoothly in
the middle, till it disappears and then starts again. Anyhow I saw all
that, made adjustments and started to play the game. While I was playing
(about 15mins), all of a sudden the picture expanded on the screen such that
objects were way off the screen that I would normally see (almost like I
zoomed in on a part of the game - or as if I had adjusted the x & y size
pots. Anyhow, it was like this and I rebooted back to test mode to
re-adjust and could not shrink the screen back to the correct size (it was
still way to stretched). I also lost the red border around the tests
screens as well and the nice smooth shrinking box no longer is smooth.. it
skips sizes and just disappears and appears as a smaller box like it is in
jerky movement mode.

        Anyhow, I am assuming that my pot(s) blew or something is fishy with
them. These are the ones I was adjusting:

XBIP: R80 Pot - 200?
YBIP: R81 Pot - 200?

XSIZE: R34 Pot - 10K
YSIZE: R48 Pot - 10K

XCENT: R39 Pot - 10K
YCENT: R55 Pot - 10K

XLIN: R38 Pot - 2K
YLIN: R50 Pot - 2K

        Anyway, can anyone confirm that I need new pots (perhaps the
x-size/y-size ones) or does anyone know if it could be something else. Any
help is appreciated.

Thanks
/\A\n\d\y/

Andrew Evrovski
Development Director
Cyberplex Atlantic, Halifax, NS
(TSE:CX)

-- 
Windows: 
32 bit graphical interface for a 
16 bit patch for an 
8 bit operating system written for a 
4 bit processor by a 
2 bit company that can't stand 
1 bit of competition. 
  
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