Conference noted::ibmpc-95

    A customer has two 8MB simms that are not working for him. 
    The part number on the chip is TI TMS418160DZ. The customer was told
    that are 72 pin 4 chip nonparity simms.
    
    
    Are they really the case?
    
    TNX Renis
    

    TMS418160:  1Mx16 5V Fast Page Mode 1K Refresh Dual CAS
    
    Four of these arranged as two banks of two DRAMs each provides 8MB of
    non-parity byte-write memory.

    Help identify this SIMM please
    
    1st Tech Corp
    20-136-70T
    954201757
    100024-70
    
    It has 8 chips on one side TC514400ASJL-70
    And 4 chips on the other side TC511000AJ-70
    
    It was to be 32meg but the system on shows it to be a 4meg

    The TC514400 parts are 1Mx4, the TC511000 are 1Mx1. Both are fast page
    mode parts.
    
    Your system is correct: that is a 4Meg (parity) SIMM.

I have a DECpc 450ST that currently has 32mb of memory in four SIMMs.
According the the old catalog that I have, to upgrade to 64mb I can add
two more 16mb SIM kits, which have a part number of FR-PCTAM-CD. 

VTX Price acts as if it does not recognize this number. What's my next
step to upgrade to a total of 64mb?

Thanks,

Art

    re .220: I used to have one (long time ago..) - are you sure it accepts
    six SIMMs? I wouldn't have thought so.
    
    
    Apart from that, I think it uses standard 72-pin SIMMs, so anything on
    the market today shoud do.
    

The 400ST's have two banks of two, for four SIMM slots.
To go beyond that, you need a memory expansion board
which I believe was specific to that PC and I doubt
they are still available.

So assuming you don't have the memory expansion board
your only option to get to 64MB is to throw away (sell)
your 4 8MB SIMMS and replace them with 4 16MB SIMMs.

Since they must be done in pairs you could also keep
a pair of 8MB SIMMs and add a pair of 16MB SIMMs and
end up with 48MB. Not what you wanted, but not bad.

You want a 36-bit (parity) 70ns 72 pin simm. They 
are available from every memory retailer.

You could also go to www.kingston.com and get the exact
replacement of the FR-PCTAM-** partnumber but it will be 
more expensive than a generic SIMM.

-Mike