Apple PowerBook 180 User Manual download pdf (Page 15)

Macintosh PowerBook 180c

Compatibility Issues

Compatibility Issues 1

Because the Macintosh PowerBook 180c is identical in most respects to the Macintosh

PowerBook 165c computer, most hardware and software designed for that model will

operate without modiﬁcation on the PowerBook 180c. This section highlights key areas

you should investigate in order to ensure that your products work properly with the

PowerBook 180c.

Color Display 1

The PowerBook 180c is the ﬁrst PowerBook computer to use a 640 x 480 pixel LCD. This

change is transparent to applications that follow the guidelines in

Inside Macintosh

The internal display controller is optimized for 8-bit color mode. Although 1-, 2-, and

4-bit modes are supported for compatibility, they provide no signiﬁcant improvement in

display performance.

The external video interface of the Macintosh PowerBook 180c computer is identical to

the PowerBook 160/180 in all respects.

See the section “Color LCD Interface” on page 9 for more information about the internal

display hardware and LCD screen.

Note

MacsBug version 6.2.2 does not properly restore the LCD frame buffer on

the Macintosh PowerBook 180c. The screen can be restored by forcing a

redraw. This problem will be corrected in future MacsBug versions.

◆

RAM Expansion Slot 1

The RAM expansion card speciﬁcation for the PowerBook 180c is identical to the

PowerBook 165c. Cards meeting Apple design speciﬁcations for the PowerBook 180

and earlier models are also compatible with the PowerBook 180c. See the section

“RAM Expansion Interface” on page 10 for more information about designing RAM

expansion cards.

Identiﬁying the PowerBook 180c 1

The correct method for software to identify the Macintosh model it is running on is by

using the Gestalt Manager routines described in

Inside Macintosh

The

gestaltMachineType

value returned by the PowerBook 180c is 71. This value can

be used to obtain the machine name string as described in

Inside Macintosh

. Applications

should not make decisions based on the machine type, but should use the appropriate

Gestalt Manager routines to determine what features are available at runtime.

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Apple PowerBook 180 User Manual Page 15