An old dream come true: Iris Indigo! - test-drb@ccmp.vtda.org

8 Nov 2007

On Nov 8, 2007, at 9:42 AM, cctalk-request at classiccmp.org wrote:

...
  Yup.  I realized after posting that message that
'SIMM' can simply be
 viewed a general form-factor.  However, more commonly it's applied to 
 the
 30pin or 72pin PeeCee variety.

 I've seen SIMM adapters that allow you to stack multiple 30pin modules 
 on
 a a 72pin socket.  Did anyone ever make a converter for any 
 workstations
 that would support using garden variety memory in, e.g. an older Iris?

 Steve 
Nope, the IP12 SIMMS have an ASIC on board to handle (something 
semi-undocumented). Looks like the SIMMS are 16-bits wide, too (2 rows 
of 9 chips, with 2 of the chips a different capacity).  Anyone tooling 
up to make an adaptor might as well go ahead and make the SIMMS and 
spare the physical install hassles (an adaptor probably wouldn't work 
in an Indigo). I have some 2MB IP12 SIMMS that I've been mulling over 
the possibility of putting higher capacity chips on, but I don't know 
if I have chips to deal with the different-sized ECC/Parity (probably, 
making a guess here though) components.