Apple Macintosh Performa 577 - Manual (Page 101)

Upgrades Macintosh Processor Upgrade - 9
Install the 68LC040
Processor on the
Upgrade Board
Caution:
Do not force the
connector pins into the
socket. Check pins to be sure
none are bent.
Note:
The alignment corner
of the 68LC040 processor is
missing one pin. The
alignment corner of the
upgrade socket is missing a
pin hole.
Spacer
68LC040
Alignment Corner
Processor