Apple Desktop Computer manual Hard Disk Drive, Video Display

C H A P T E R 3

Devices and Ports

The mechanism inside the Apple USB mouse is similar to that in the Apple Desktop Bus Mouse II. The mouse ball is removeable for cleaning; the ring that allows access to the ball can be locked by inserting an unfolded paper clip into a small hole and turning the ring clockwise.

Hard Disk Drive

The iMac computer has an internal hard disk drive. The drive uses the extended IDE (integrated drive electronics) interface, which is also referred to as the ATA interface. The implementation of the ATA interface on these computers is a subset of the ATA/IDE specification, ANSI proposal X3T10/0948D, Revision 3 (ATA-3).

The software that supports the internal hard disk is the same as that in previous Macintosh PowerBook models with internal IDE drives and includes DMA support. For the latest information about that software, see Technote #1098, ATA Device Software Guide Additions and Corrections, available on the world wide web at

http://developer.apple.com/technotes/tn/tn1098.html

The web page for Technote #1098 includes a link to a downloadable copy of ATA Device Software Guide.

Video Display

The built-in video display uses a 15-inch CRT (13.8-inch viewable diagonal). The CRT uses shadow-mask technology and has a dot pitch of 0.28 mm. The display is multi-scan and supports three resolutions. Table 3-2 lists the resolutions and the pixel depths supported with either the standard 2 MB of SGRAM or with expanded SGRAM.

34Hard Disk Drive