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 IBM Blue Lightning BL3-75MHz View next topic
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Anonymous Coward



Joined: 20 Nov 2004
Posts: 589
Location: Shandong, China

PostPosted: Mon Jul 09, 2007 10:55 am Reply with quoteBack to top

Is anyone familiar with this CPU? Is there any software to configure the registers? I would like to run the chip with a 2X multiplier if possible.
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wdegroot



Joined: 03 Feb 2006
Posts: 488
Location: pennsylvanai

PostPosted: Mon Jul 09, 2007 2:34 pm Reply with quoteBack to top

all I remember is thayt IBM could only sell the chip as part of a motherboard
perhaps soldered on the mb,.
and that all these boards had 4? dimm sockets.
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Anonymous Coward



Joined: 20 Nov 2004
Posts: 589
Location: Shandong, China

PostPosted: Tue Jul 10, 2007 4:15 am Reply with quoteBack to top

IBM was not supposed to be allowed to produce stand alone CPUs using intel designs, however they did manage to sell the CPUs as upgrade modules...and somehow 3rd party vendors also got a hold of the chips and sold them as upgrade modules. Both Evergreen and Kingston produced them, but mine is from some obscure japanese brand.
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ryan



Joined: 19 Apr 2006
Posts: 261
Location: WisConSin

PostPosted: Thu Jul 12, 2007 2:36 am Reply with quoteBack to top

From what I remember those chips have a fixed multiplier, though one point of confusion with me is how evergreen could claim its 286 rev to 486 chip could always run at 66mhz regardless of the original clock.
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Anonymous Coward



Joined: 20 Nov 2004
Posts: 589
Location: Shandong, China

PostPosted: Thu Jul 12, 2007 10:34 am Reply with quoteBack to top

It's quite simple really, their modules use their own timing crystals and support chips to run asynchronously to system bus. I'm not an electronics engineer, but I am certain it can be done.

I'm not so certain I agree with the multiplier on the blue lightning. I am pretty certain that the multiplier can be changed either through software or by manipulating a pin. I will examine the CPU module more closely to see how they implement their 3x and 4x modes.
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