Apple Performa 6400/180 - Manual (Page 181)

Upgrades DRAM DIMM Upgrade - 10
EDO-Compatible Logic Board Identification
Before you install extended data out (EDO) memory in a
Performa or Power Macintosh 6400 computer, you must
verify that the logic board is EDO-compatible.
There are four ways to verify that a logic board from a
Performa or Power Macintosh 6400 computer is
compatible with EDO memory:
• The logic board is the original board that shipped in a
Macintosh Performa 6400 equipped with an internal Zip
drive
• The logic board has soldered-on EDO DRAM
• The logic board has a resistor present at chip U34
• The logic board has
no
resistor present at location R77
The details for identifying an EDO-compatible logic board by
these methods are presented in the following sections.