The Personal LaserWriter NT has two SIMM sockets that can accept either 1MB or
4MB SIMMs. Because both SIMMs must be of the same density, the total RAM can
be either 2MB or 8MB. The Personal LaserWriter NT ships with two 1MB SIMMs.
Therefore, the only upgrade path is to replace the two 1MB SIMMs with two 4MB
SIMMs.
The requirements for the 4MB SIMMs are the same as for standard Macintosh II
SIMMs, but they must be rated at 100ns or faster. They must also fit in a
significantly smaller space than the Macintosh II family allows. This
eliminates 4MB SIMMs made from lots of 1MB DRAM chips.
Here are several vendors that advertise compatible 4MB SIMMs:
The Chip Merchant
MacCenter
MacSystems/Lifetime Memory Products
Memory Plus
Stratum Technologies
To locate a vendor's address and phone numbers, use the vendor name as a
search string.
Article Change History
23 July 1993 - Company title updated from MacSystems to MacSystems/Lifetime
Memory products.
14 September 1992 - Reviewed. for technical accuracy.