Apple Macintosh 6500 - Manual (Page 197)

Your computer comes with 32 megabytes (MB) of dynamic random-access
memory (DRAM) preinstalled in one of the Dual Inline Memory Module
(DIMM) sockets. One DIMM slot remains for installing an additional 8 MB,
16 MB, 32 MB, or 64 MB DIMM. If you want to install the maximum amount
of memory, you need to replace the preinstalled 32 MB DIMM with a 64 MB
DIMM, then install a second 64 MB DIMM in the remaining slot, for a total
of 128 MB of DRAM.
IMPORTANT The DIMMs should be 64-bit wide, 168-pin 5-volt (V) Extended
Data Output (EDO) DIMMs, with 60-nanosecond (ns) RAM access time or
faster and a 1K or 2K refresh count. The Single Inline Memory Modules
(SIMMs) from older Macintosh computers are not compatible with your
computer and should not be used. 3.3-V DIMMs and DIMMs that require a
4K refresh count also should not be used
If you decide to have additional DRAM installed in your computer, the
DIMMs can be installed one at a time in any order in either of the
memory slots.
Instructions for installing DIMMs are in the section “Installing DIMMs or a
High Performance Module” later in this appendix.
High Performance Module configurations
A High Performance Module (256K level 2 cache) provides an overall
increase in your computer’s performance. Although the computer’s processor
speed stays the same when you install a High Performance Module (see your
Technical Information booklet for the exact speed), your computer performs
tasks significantly faster. If your computer did not come with one already
installed, you can add a High Performance Module on the main logic board.
IMPORTANT Be sure to use a 50 Mhz High Performance Module designed
specifically for your computer. The 40 Mhz modules used in other Macintosh
computers will not work in your computer.
Instructions for installing a High Performance Module are in the section
“Installing DIMMs or a High Performance Module” later in this appendix.
197 Installing Expansion Cards or Additional Memory