Re: Misaligned Vectors in Cinematronics

Have you tried playing with the line length pots on the monitor?

The feed back diodes on the monitor (near the TL081) also effect how lines are
drawn.

Also, there were two different yoke designs on the Cine monitors. One (the
earlier one) required an extra set 1.2k resistors across the yoke windings. The
later one required these to NOT be there.

If someone in the past replaced the yoke/CRT assembly with one that is different
than the one the monitor board is configured for, you won't be able to line up
the lines.

The resistors in question are R122 and R222 on the original Space Wars monitor
schematic available on spies.

It's unlikely your DACs are bad. Things are drawn pretty dramatically wrong,
when they go.

On another subject, I'd like to get a copy of your Rock Ola ROMs (I don't
believe I've seen those). It be interesting to hear if they changed to morse
code sequence... That and I've never played "Armour Attack" does that translate
to "Love Attack"? ;^)

-Zonn

On Sat, 24 Mar 2001 23:58:17 +1100, Paul Sommers <rgvac_aust@dingoblue.net.au>
wrote:

>Hey gang!
>
>Well - I didn't fix my Space Wars boards, but this afternoon my set of
>untested Armour Attack boards arrived... and they worked!!!!
>
>But they have shown up a problem with the monitor which wasn't obvious with
>Space Wars in the 3 seconds that it worked. Although I do remember when you
>rotated a ship the vectors didn't quite meet properly.
>
>The lines aren't lining up straight. It also appears the bigger the vector
>drawn the more it is out.
>
>Here's a picture:
>http://au.photos.yahoo.com/bc/rgvac_aust?e&.intl=au&.flabel=fld1&.from=d&.pindex=1&start=1&.src=ph&.done=http%3a//au.photos.yahoo.com/bc/rgvac_aust%3fd%26.flabel=fld1%26.intl=au%26.src=ph
>
>As you can see the text isn't bad, but the playfield boundary is. (The double
>image isn't a problem it's my bad camera work). The tanks and main screen
>looks good, but the helipcopter blades aren't correct.
>
>I replaced the TL081's on the chassis but no change.
>
>As there was a slight problem with the Space Wars ships also - I am guessing
>it's in the Analogue section of the chassis. Any ideas what to check next? The
>monitor has been capped.
>
>By the way - just how obtainable are the big obsolete looking DACS. Should I
>get a couple if I can find them?
>
>Also - I have a different rom set to MAME - you can see that from the test
>screen in that it doesn't draw the overlay pattern. Also the main screen reads
>copyright Rock Ola. Should I read these in for anyone? I guess I'll put the
>MAME roms in so I can line up the overlay easily.
>
>Cheers
>MacMan
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Received on Sat Mar 24 14:22:33 2001