Re: Tempest Color Vectors

Checked it with both a logic probe and scope. I’m getting like signals in comparison with the good working board and bad.
Getting the same analog signals from 4,6,10,12. Digital type signals from 5,7,9,11. I’ve got some ic’s coming to piggyback, but that’s not one of them. Couldn’t source it.
I think what’s throwing my scope and probe signals is that I am getting one, just not the right color.
Ordered a stock of:
SN74LS175N
SN74LS139AN
SN74LS32N
SN74LS399N
SN74LS164N
SN74LS174N
I don’t have much of a stock of TTL’s to test with. Hoping they piggyback well.

From: Kevin Moore
Sent: Saturday, December 08, 2012 6:58 AM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Tempest Color Vectors

Have you checked the color ram at P9?

On Sat, Dec 8, 2012 at 5:17 AM, Rodney Massman <rmassman@hotmail.com> wrote:

  Been working on a Tempest for a friend. At first there was no video but the game played fine.
  I found a broken trace between K5 and K3 as someone long ago attempted to replace a 2114
  and in the process, burnt a trace.
  So I got video back, however have come across the most peculiar problem. At first I thought it
  was a simple issue of the color transistors, so I replaced Q2-4. Nothing changed. I also replaced Q8-10.
  I am completely missing Red, Green and Yellow. Has anyone else come across this problem?

  Bad color vectors:
  http://i269.photobucket.com/albums/jj63/rmassman/IMG_3111.jpg
  http://i269.photobucket.com/albums/jj63/rmassman/IMG_3146.jpg

  What it should look like:
  http://i269.photobucket.com/albums/jj63/rmassman/IMG_3112.jpg
  http://i269.photobucket.com/albums/jj63/rmassman/IMG_3149.jpg

  Thanks for any help.

  Rodney

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Received on Sat Dec 8 09:57:39 2012