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Arcade Collecting => Miscellaneous Arcade Talk => Topic started by: vanwatson on December 12, 2014, 02:31:54 pm

Title: Arcade games CPU clock speed and GPA clock speeds are at different speeds why?
Post by: vanwatson on December 12, 2014, 02:31:54 pm

Why are arcade CPU clock speed and GPA/TIA chips cock speeds both at a different speed rate?

Some arcade games use the same or one clock speed for the CPU, the RAM and ROM clock input signal, GPA
Other Arcade games use different clock speeds for the CPU,RAM chips , ROM chips and GPA

example:
Atari 2600
CPU clock  is 1.19MHZ
GPU is 3.58MHZ

Atati 7800
CPU clock is 1.79MHZ
GPU is 7,19MHZ

Title: Re: Arcade games CPU clock speed and GPA clock speeds are at different speeds why?
Post by: SavannahLion on December 12, 2014, 02:45:11 pm

Google the following
Racing the Beam
Magic quartz crystal value

Read and understand
http://www.catb.org/esr/faqs/smart-questions.html (http://www.catb.org/esr/faqs/smart-questions.html)
Before you return

Title: Re: Arcade games CPU clock speed and GPA clock speeds are at different speeds why?
Post by: PL1 on December 12, 2014, 09:30:34 pm

Quote from: SavannahLion on December 12, 2014, 02:45:11 pm

http://www.catb.org/esr/faqs/smart-questions.html (http://www.catb.org/esr/faqs/smart-questions.html)

Thanks SavannahLion.   :notworthy:

Added a link to the FAQ here (http://newwiki.arcadecontrols.com/index.php?title=FAQ#Forum_tips_for_asking_questions_that_get_good.2Ffaster_answers:).

This is the most useful thing yet to come out of a vanwatson thread.   >:D


Scott

Title: Re: Arcade games CPU clock speed and GPA clock speeds are at different speeds why?
Post by: jennifer on December 12, 2014, 10:37:09 pm

    **Jennifer hides a laugh.... (Snicker, Snicker) :laugh2:

Title: Re: Arcade games CPU clock speed and GPA clock speeds are at different speeds why?
Post by: lilshawn on December 13, 2014, 12:26:53 pm

why does my GTX750ti memory run at 5.4ghz but my GPU only run at 1.15 ghz?

Title: Re: Arcade games CPU clock speed and GPA clock speeds are at different speeds why?
Post by: vanwatson on December 13, 2014, 12:44:02 pm

I have notice certain arcade games using the same clock frequency signal for the CPU, GPU/TIA/VIDEO ROM, ROM CHIPS, RAM CHIPS
But other arcade games using different clock frequencies signals for the CPU, GPU/TIA/VIDEO ROM, ROM CHIPS, RAM CHIPS

I don't understand why and what's the difference between using the same clock frequency compared to using different clock signals for each chip

Title: Re: Arcade games CPU clock speed and GPA clock speeds are at different speeds why?
Post by: SavannahLion on December 13, 2014, 04:03:52 pm

I gave you two excellent starting points as to why the T.I.A. is clocked at a very specific frequency.

The Atari 2600 programming docs have a very concise explanation as to why the 6507 runs at the frequency it does.

This kind of information will go a long way to help you understand.

Are you still posting this same crap in other forums?

Title: Re: Arcade games CPU clock speed and GPA clock speeds are at different speeds why?
Post by: vanwatson on December 13, 2014, 04:15:01 pm

Quote

I gave you two excellent starting points as to why the T.I.A. is clocked at a very specific frequency.

Are you talking about this Google the following
1.) Racing the Beam
2.) Magic quartz crystal value

Quote

Are you still posting this same crap in other forums?

No