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Conference hydra::amiga_v1

Title:	AMIGA NOTES
Notice:	Join us in the NEW conference - HYDRA::AMIGA_V2
Moderator:	HYDRA::MOORE

Created:	Sat Apr 26 1986
Last Modified:	Wed Feb 05 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	5378
Total number of notes:	38326

1739.0. "XCLK on RGB port?" by WJG::GUINEAU (Not enough moving parts) Tue Oct 04 1988 08:39

While reading through "The Amiga System Programmers Guide" I ran across
a section on the Hardware stating that the RGB connector has an input
for an external clock (called XCLK I think).

They say you can increase the speed of the Amiga by supplying a faster
clock on this pin, (and another pin - XCLK_ENA (sp?) to enable the external
clock). Also they indicagte the fastest clock speed must be determined "by
experiment".

Is this the same issue as in another note on cranking up Amys Alpha Waves?

John

T.R Title User Personal
Name Date Lines

1739.1 No guarantees at faster clock rates NAC::PLOUFF Cider Season Has Begun Tue Oct 04 1988 13:45 12

T.R	Title	User	Personal Name	Date	Lines
1739.1	No guarantees at faster clock rates	NAC::PLOUFF	Cider Season Has Begun	`Tue Oct 04 1988 13:45`	12
	> Is this the same issue as in another note on cranking up Amys Alpha Waves? Probably. However, note that if you do put in a faster clock (I think XCLK should be a substitute for the 14 MHz clock), there are two side effects. As the clock speed rises, you are eating up timing margins in the hardware, and at some point the machine will go flaky. It will also become sensitive to changes in temperature and load on the power supply (like number of disks running at once). Also, the video timing will change (less flicker!) and at some point your monitor will not sync up. Don't know which happens first. Wes

> Is this the same issue as in another note on cranking up Amys Alpha Waves?
    
    Probably.  However, note that if you do put in a faster clock (I think
    XCLK should be a substitute for the 14 MHz clock), there are two side
    effects.  As the clock speed rises, you are eating up timing margins in
    the hardware, and at some point the machine will go flaky. It will also
    become sensitive to changes in temperature and load on the power supply
    (like number of disks running at once).  Also, the video timing
    will change (less flicker!) and at some point your monitor will
    not sync up.  Don't know which happens first.
    
    Wes