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Author Topic: How to identify trackball size?  (Read 1482 times)

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Wade

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How to identify trackball size?
« on: March 21, 2003, 11:14:30 am »
I bought an Imperial trackball from ebay recently.  I want to get a new ball, mounting plate, and maybe rollers.

I *thought* it was a 3" trackball.  I assumed that meant 3" diameter.  It is approximately 3" diameter but I haven't measured it.  Then, while looking at the plates on happs, it looks like the "size" might actually be the diameter of the VISIBLE part of the ball?  Mine appears to be about 2.75" visible diameter.

How do I know which I have?  I need to get a plate and ball ordered pronto.  I'm getting a little worried about beating Bob Roberts to death with silly questions.

Thanks,
Wade
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Birdtales

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Re:How to identify trackball size?
« Reply #1 on: March 21, 2003, 11:18:38 am »
It refers to the diameter of the ball. Arcade trackballs are either 3" or 2 1/4". 2 1/4" is the same size as a pool ball. If your trackball is larger than a pool ball you can bet it's a 3".
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Wade

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Re:How to identify trackball size?
« Reply #2 on: March 21, 2003, 03:25:40 pm »
Great, I'll just measure the ball accurately then.

Thanks,
Wade
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Tiger-Heli

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Re:How to identify trackball size?
« Reply #3 on: March 22, 2003, 03:05:20 pm »
Quote from: Birdtales on March 21, 2003, 11:18:38 am
It refers to the diameter of the ball. Arcade trackballs are either 3" or 2 1/4".
Except Missile Command and some bowling games used like a 4" or 4.5" ball
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u_rebelscum

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Re:How to identify trackball size?
« Reply #4 on: March 22, 2003, 10:30:54 pm »
Quote from: Tiger-Heli on March 22, 2003, 03:05:20 pm
Quote from: Birdtales on March 21, 2003, 11:18:38 am
It refers to the diameter of the ball. Arcade trackballs are either 3" or 2 1/4".
Except Missile Command and some bowling games used like a 4" or 4.5" ball

and old school atari football and atari soccer had 4", too.
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