IRIX on Personal Iris - test-drb@ccmp.vtda.org

9 May 2002

On May 9,  9:50, Robert F Schaefer wrote:
...
  On May 9, 15:02, Jochen Kunz wrote: 
...
  > So, if I "upgarde" the 4MB SIMMs to 8MB
SIMMs, I can put in more than
 > one bank of "upgraded" SIMMs? Or is this bug speciffic to the 4MB SIMM
 > ASIC and the 2MB and 8MB SIMM ASICs are different? 
...
  The 2 meg SIMMS are full o' chips, the 4 meg SIMMS
are only half-populated,
...
  fill it out to make an 8 meg SIMM.  It would appear
that the ASIC is the
 same on the 4 meg and 8 meg SIMM.  I would like to know if the ASIC is the
...
  same on the 2 meg SIMM.  I have a number of them, and
I would rather
 unsolder the old RAM chips and replace them than screw with the only set of
...
  working 4 meg SIMMs I have. 
Good idea.  Yes, the ASICs are the same on all the SIMMs: LSILOGIC L1A6569,
DDM1, Rev.C, SGI 9700832.  The date codes and manufacturer code/batch
number may vary from SIMM to SIMM, of course.

If you upgrade a 2MB SIMM (514256 chips) with 514100 chips, remove the
75-ohm resistor at R6 (may be marked 75R or 750) and fit a new 2K2 resistor
at R5.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York