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Conference nesbit::modular

Title:Embedded and Real Time Modular Computing Conference
Moderator:IRNBRU::GRANT
Created:Tue Sep 05 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:235
Total number of notes:1091

201.0. "EBM3x-Px (Rushmore) miscellany" by CIMCAD::PIERSON () Tue Apr 08 1997 15:50

    Question:
    	Assuming there is a faster cpu chip on hand, can the EBM3x-Px
    	have its speed changed, by simply rejumpering?
    
    Answer:
    	Yes.  The jumper info is on the SBC card, and such changes have
    	worked.  In exceptional (poorly cooled) cases, be sure that the
    	cooling is OK....
    
    	regards
T.RTitleUserPersonal
Name		DateLines
201.1New BIOS/NEW HAL?GONE::PIERSONTue Apr 29 1997 17:2510
    Question:
    	If a bios (console) upgrade is performed, should a new HAL be
    	needed or a new build of NT?
    
    Answer:
    	In general no.  In specific, odd ball cases, confined to proto
    	boards, maybe.
    
    	regards
    	dwp
201.2Slowing the ISA Bus?GONE::PIERSONMon May 05 1997 21:3234
Question:
    	Can the EBM3x-Px run the ISA bus at slower speeds:
Answer:
    No.
    
Details:
    
*PCI spec is 33mhz.
    
*Any option requiring to run under 33mhz is poorly designed and non PCI/PICMG 
compliant, hence unsupported, & a potential support minefield.
    
*Having said that, the bus speeds can be reduced (PCI 30mhz via j5) BUT: this 
reduces the clocking of other buses.

ISA bus @ 8.33mhz  (pci bus speed  / 4)
PCI bus @ 33mhz	    (host bus speed /2)	
Host bus @ 66mhz  

Processor speeds are multiple of HOST speed, (ie. 1* = 66mhz, 1.5*= 100mhz, 
2*=133mhz, 2.5*= 166mhz, 3*=200mhz)

So theoretically, to support the 25mhz PCI bus, the customer would require
     50mhz pentium (host @ 50mhz, PCI@ 25 mhz, ISA 8.33mhZ). Maybe.

The above is entirely untested and entirely not supported.

    regards
    	dwp
Have a good weekend 
Billy Mcilear