[sci.electronics] Need help specifying 1M x 9 bit SIMM chips

wtm@uhura.neoucom.EDU (Bill Mayhew) (01/19/91)

I'd like to know something about SIMM modules.  I can get generic
1M x 9 SIMM memory strips from a local vendor that are made from
Samsung 41C1000AJ-8 PLLC chips for $50.00 each.

I have a bunch of HP Vectra QS-25 25 MHz '386 machines in my
student lab for which I'd like to increase memory.  My HP reseller
insists that there is something special about Vectras, but I'm not
convinced that they have anything more special than interleaved
memory.  The HP reseller wants to sell me memory kits that use
Samsung 41000BJ-8 PLLC chips.  Curiously, :-), his kits are about
2x the cost at $389 for 4 SIMM strips.

I've used the 41C1000AJ-8 SIMMs in a generic 33 MHz '386 that has
interleaved memory with one wait state.  According to the clone
manual "fast page mode" SIMMs are required.

The upshot is, what does the C in "41C1000AJ-8" denote?  What is
the difference in the "A" and "B" in the suffix?  Obviously, the
"J" denotes plastic packaging.  I called Samsung, but I've been
palying phone tag between their voice mail and our voice mail for
several days.  I ordered the Samsung memory products book, but my
guess that'll be shipped by 3rd class banana boat....

I have 12 machines that need 4 meg each, so there is a potential to
save $2400 in one shot; about enough to buy a whole extra computer
system.  A lot of other departments around here use Vectras too, so
there is potential to save serious bucks.


Thanks a bunch,
==Bill==
-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu   ....!uunet!aablue!neoucom!wtm
via internet: (140.220.001.001)