🚀 go-pugleaf

In article <6062jc$ee5$1@earth.superlink.net>
           bcigar@saturn.superlink.net "Kevin Kramer" writes:

>         The heat sink was attached by the cpu's prior owner, giving
> little assurance of correct orientation.  Closely examine the cpu for a
> gold dot, a gold +, or a flattened corner as indicatation of pin 1.  The
> heatsink is attached by tape and can be removed with some effort.
> Removing the heatshink should not be needed and is not recommended. 
> Reattaching the heatsink will cerainly provide lesser heat conductivity.
> That tape does an amazingly good job of transfering heat.  At 20mhz the
> cpu shouldn't get too hot but it wouldn't be a good idea to test it with
> your finger.  Unless your hiding from the authorities and wish your finger
> print removed. :-)
> 
> 
> Kevin
> 

Actually..... that's been very helpfull - one closer examination
THERE IS a small gold dot just at the corner of the central gold
square which is a the designated suspected pin 1 position below -
ie which corresponds with the paint mark on the heat sink.

Many thanks - it helps to know what to look for....... 

> 
> David Longley (David@longley.demon.co.uk) wrote:
> : I have a Cyrix Upgrade Chip with heat sink attached to it. I'm 
> : considering replacing the Intell 386-20 in a COMPAQ DESKPRO 386-20
> : (circa 1988). 
> 
> : Unfortnately, I can't see any orientation edge on the CYRIX Chip.
> : There's the CYRIX labelling on the underside of the CPU, but....
> : Is there sdome convention re the orientation of the labelling 
> : on the underside of CPUs regardless of manufacturer? How can
> : one tell which way to insert the chip? 
> 
> : There *is* a white paint mark on the heatsink and I have indicated 
> : its relative position by the 1 on the CYRIX chip relative to the 
> : text on the underside.
> 
> : Similarly, on the Intel chip, I have marked where the notch is 
> : relative to the text on the underside.
> 
> : Intel Underside     Cyrix Underside 
> 
> :  ------------1       ------------ 
> : � 37434420AA �      �1992CyrixUSA�
> : � MALAY   51 �      �      JAPAN �
> : � B          �      �            �
> : �            �      �            �
> :  ------------        ----------- 1
> :                                 suspected
> :                               orientation pin
> :                        (white paint mark on heat sink)
> 
> : Has anyone got one of these CPUs lying about without a heat sink on top 
> : which gives some idea of the pin one location?
> 
> : -- 
> : David Longley
> 
> : Longley Consulting                                                  London, UK> : Behaviour Assessment & Profiling Technology,
> : Research, Data Analysis and Training Services,
> : Small IT Systems                                http://www.longley.demon.co.uk> 
> 

-- 
David Longley (check end reply line #)

Longley Consulting                                                  London, UK
Behaviour Assessment & Profiling Technology,
Research, Data Analysis and Training Services,
Small IT Systems                                http://www.longley.demon.co.uk