Jump to content
IGNORED

Atari Space Race 1973 Board Repair Questions


The Butcher
 Share

Recommended Posts

Hello. My first post. I am repairing Space Race and have a few questions.

 

What type of video is outputted? i presume the game uses composit video as there is only one 'video' line mentioned.

 

I have repaired some corrosion etc. I am replacing electrolytic capacitors as many of them read low. I have repaires the 14MHz clock. There was an open circuit track.

 

I am having problems with the reset circuit. The board uses a 555.

 

What does the "Ant" pin do? It has a symbol of an antenna on the circuit. The pin leads to a base of a transistor. What does this thing do?

 

 

That will do for now. Thanks in advance!

Link to comment
Share on other sites

There's a little sliver of information in the Technical section of this page that might help:

http://www.arcade-museum.com/game_detail.php?game_id=9681

 

"The monitor is a television set converted to a composite monitor, three wires audio, video and ground come from the board an hook to the antenna connectors on the set."

Edited by BigO
Link to comment
Share on other sites

Thank you sir! I am tripping over a fault with the board. Funny electronic design. Being that there is no CPU / RAM / ROM, this board is a challenge. I need some time I think, to work out what is going on with the circuit (Understanding it). Pretty interesting. This project is a good learning curve. I am replacing all electrolytic capacitors, as the 555 chips use these to generate game time and fuel indicator measurement.

 

I have schematic diagrams, which I have touched up. Removed rubbish and merged two into one. I can upload if anyone wants this.

 

Very cool!

 

Thanks all.

Link to comment
Share on other sites

Indirect help at best, but here are a couple of analyses of Pong that I looked at when I very briefly considered building a miniature reproduction. Not that it's the same game, but maybe you can relate some of the principles and analysis approach to what's going on in Space Race.

 

http://www.worldphaco.com/uploads/LAWN_TENNIS.pdf

http://www1.cs.columbia.edu/~sedwards/papers/edwards2012reconstructing.pdf

 

(Some of it references Dan Boris' work which can be found somewhere in his AtariAge blog: http://atariage.com/forums/blog/52-danboris-tech-blog/)

 

Good luck.

  • Like 1
Link to comment
Share on other sites

Hey BigO. I did like The Traveling Wilburys...

 

Thanks for the links to documents you provided. That was just what I am looking for. A description of how it works. Pretty neat for back then. FPGA is the way to go today. I am not a programmer. I stil need to read the documents.

 

I understand the VCO chips (NE566) and how they generate sound. Video generation is pretty cool. I am an ex TV tech with basic knowledge of how composite video works. Generating video with TTL chips is pretty cool. Wait until I figure out the reset circuit (which has been modified by someone way back. I think I can get this monster to work.

 

Thanks both of you.

 

More to follow. Cheers.

Link to comment
Share on other sites

  • 3 weeks later...

 

 

What does the "Ant" pin do? It has a symbol of an antenna on the circuit. The pin leads to a base of a transistor. What does this thing do?

 

 

 

 

I really enjoy space race. I'm glad to see someone taking the time to restore one.

 

The antenna pin doesn't go to anything it is just a length of wire can't remember how long that hangs of the edge connector. It is used to shutdown the credit circuit if it senses some one trying to shock the cabinet as a way to get free credits

  • Like 1
Link to comment
Share on other sites

Thanks BigO. The links to the Pong description contained a wealth of information! Manual said about 12 inches length (300mm). shorter will desensitise it and longer will make it more sensitive.

 

I figured that the raster rate would be 60Hz. Here in New Zealand, ours is 50Hz. My test TV is 50HZ (only?). Time to dig out my trusty Amiga monitor!

 

Thanks for the help. I see that MAME now supports Space Race. It IS quiet fun to play!

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...