Thanks to all who responded (total of 40!).
Is it really true that to upgrade factory shipped IPC's and
SLC's beyond 8 megabytes, the existing memory becomes useless
$ilicon (sic)? Must they be removed to accomodate only 4MB
Please share your experiences with me.
SLC has 4 slots that can only accomodate special 36bit 4mb
bernards@ECN.NL (Marcel Bernards) says:
An SLC uses special 36*4 Mbit Simm's (4 parity chips
and 32 bits data) So an SLC which has 4 slots can
contain a maximum of 4*4 Mbyte = 16 Mbyte Memory.
So the only way to upgrade from 8 mb is to add up to two more
of these special SIMMS for up to 16Mb total.
IPC has a total of 12 slots divided up 3 banks of 4 slots. It
uses industry standard PC and MAC compatible 1 and 4 MB SIMM
Each bank of 4 slots must contain the same type of memory
(either 4MB or 1MB). Each of the three banks may have either 1
or 4 MB SIMMS (not mixed within a bank of four slots).
The 4 MB SIMMS must occupy the lower memory bank addresses.
So, this is what I am going to do with my two IPC with 8 1MB
I will buy only 4 4MB SIMMS.
I will remove the 4 1MB SIMMs from the first bank and
replace them with 4 4MB SIMMs.
IPC #1 now has 20 MB.
I will take 4 1MB SIMMS and place them in the last bank
of IPC #2.
IPC #2 now has 12 MB.
And, this is what I am going to do with my SLC.
I will buy 2 special 36bit 4MB SIMMS
I will add 1 SIMM to each SLC
BOTH SLC's now have 12 MB.
I think this is the lowest cost solution to my problem. And I have
not wasted any $ilicon! However if I were to have extra 1 MB IPC type
SIMM I could use them in an SS1, MAC, or PC clone.
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