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ptorric
 Post subject: static 6502
PostPosted: Mon Feb 09, 2009 8:03 pm 
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Posts: 85
if i remember well, not all 6502 version are static (with no clock speed lower limit)
where can i find which one?

btw: are also i can find a simple description of phases?

tnx
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GARTHWILSON
 Post subject:
PostPosted: Mon Feb 09, 2009 8:54 pm 
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All the CMOS ones (65C02) can be stopped indefinitely with the clock high. WDC's with the part number ending in "S" (which means all of them for the last ten years or so) can be stopped in either phase. The old NMOS ones have a minimum clock speed of 50 or 100kHz.
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ptorric
 Post subject:
PostPosted: Mon Feb 09, 2009 10:56 pm 
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GARTHWILSON wrote:
All the CMOS ones (65C02) can be stopped indefinitely with the clock high. WDC's with the part number ending in "S" (which means all of them for the last ten years or so) can be stopped in either phase. The old NMOS ones have a minimum clock speed of 50 or 100kHz.


thank you.
do you have experience in using a parallel port (well, a usb parallel port adapter) for drive clock?
i'm not sure about the frequency that i can handle with it.
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GARTHWILSON
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PostPosted: Tue Feb 10, 2009 12:05 am 
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Quote:
do you have experience in using a parallel port (well, a usb parallel port adapter) for drive clock?

no experience there, but if you're trying to simplify the clock circuit, the CMOS 6502 has an onboard oscillator and can use a crystal with no outboard oscillator, or just a resistor and capacitor if the frequency accuracy is not critical.
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