Apple iMac - Manual (Page 18)

C H A P T E R 1
Introduction
18 Compatibility Issues
The back of the case contains the receptacle for the power cord and a small
folding handle for use in removing the access cover on the bottom of the case.
The right side of the case, as viewed from the front, contains the I/O bay behind
a hinged cover. Figure 1-2 is a side view showing the I/O bay with its cover
open.
The I/O bay contains the following features:
■ Sound input and output jacks
■ Two USB ports
■ Ethernet port
■ Modem connector
■ Access to programmer’s buttons through two small openings (upper one for
reset, lower one for NMI)
The bottom of the case has a hinged support that can be used to tilt the front of
the computer upward by about 17 degrees.
The back portion of the bottom of the case is a removable plastic cover, retained
by a screw, that can be removed to allow access to the main logic board and
drive assembly. That entire assembly can be removed for installation of
expansion RAM.
Compatibility Issues 1
While the iMac computer has many new features, there should be no
compatibility problems with applications that operate correctly with earlier
Macintosh models. Compatibility issues for expansion and peripheral devices
are listed here.
System Software 1
The iMac computer has newly designed system software that provides Open
Firmware booting and Mac OS ROM in RAM. The system software is described
in Chapter 5. For software compatibility information, see “Compatibility”
(page 59).