Apple Performa 6400/180 - Manual (Page 183)

Upgrades DRAM DIMM Upgrade - 12
Soldered-On DRAM is
EDO
1 Locate the two soldered-
on DRAM chips.
2 Compare the markings
on these chips to the
examples in the EDO
Chip Identification table
on the next page. If the
soldered-on DRAM chip
markings meet the
criteria of an example
here, the logic board
supports EDO memory.
Soldered-On
DRAM