Subject: Re: 240/260 CPU hacking....
To: John Maier <jmaier@midamerica.net>
From: Brian Hechinger <wonko@entropy.tmok.com>
List: port-pmax
Date: 03/20/2001 19:20:27
John Maier drunkenly mumbled...
> 
> Actually for cross reference sake, can anyone with a /260 look and tell me
> what the part numbers are on the two big non heatsinked LSI chips?  Also if
> anyone has gotten up the courage  to crack the heat sink off the MIPS chip
> (dead DECstation or just insane curiosity) let me know what numbers lurks
> beneath...

after remembering what pile the /260 was at the bottom of (i'd love to get it
working, but it's dropped way to the bottom of the priorities list):

it's got a single (very large) LSI chip:

LSI
L1A7710
21-37404-01
DC7268B
NAC 9343(triangle)

between the LSI chip and the CPU is a connector that i don't remember seeing
on my /240, although it has been a while since i've looked at the /240

it's got 4 rows of 24 pins each.

as far as removing the CPU's heatsink, it's got two stud/nut combos holding
it on (almost like the Sun SuperSPARC CPUs) and if someone says it isn't also
glued i'll see if i can dig up a socket that will fit them and attempt to
remove the heatsink.

staring at these HUGE memory modules really makes me want to get this thing
running.  hmmm, now where did i put those spare SCSI disks.............

something else to notice about this box i have is the sticker on the back that
says: Product Conversion From KN03 To KN05

the KN03 is the /240 and the KN05 is the /260 i believe.  this definitely has
the mainboard of a /240, don't know if a "true" /260 would look any differently
on the inside, although judging from what i know about DEC's thinking and from
what i've seen of their hardware they tend to make a few pieces as possible.
one mainboard for 5 different CPU daughterboards (i'm gonna take a guess and
say this mainboard is also used for the /200??)

just the little bit i have to add to the pot.

-brian