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CHAPTER 1
Hardware
Compatibility Issues
5
Compatibility Issues 1
Because the Macintosh PowerBook 165c is identical in most respects to the Macintosh
PowerBook 160/180 computers, most hardware and software designed for those models
will operate without modification on the PowerBook 165c. This section highlights key
areas you should investigate in order to ensure that your products work properly with
the PowerBook 165c. These topics are covered in more detail in subsequent sections.
Color Display 1
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 LCD controller circuitry includes a 256-entry color look-up table (CLUT) and is
compatible with software that uses QuickDraw and the Palette Manager. The controller
supports a palette of 262,143 colors. However, due to the nature of LCD technology, some
colors are dithered or exhibit noticeable flicker. Apple has developed a new gamma table
for this display that minimizes flicker and optimizes available colors. With this
gamma table in place, the effective range of the CLUT is 4096 colors.
See the section “Color LCD Interface” on page 9 for more information about the internal
display hardware and LCD screen.
The external video interface of the Macintosh PowerBook 165c computer is identical to
the PowerBook 160/180 in all respects.
Note
MacsBug version 6.2.2 does not properly restore the LCD frame buffer on
the Macintosh PowerBook 165c. The screen can be restored by forcing a
redraw. This problem will be corrected in future MacsBug versions.
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RAM Expansion Slot 1
The RAM expansion slot is compatible with RAM expansion cards meeting Apple design
specifications for the Macintosh PowerBook 180 and earlier models. However, the design
of the PowerBook 165c provides more physical space for RAM expansion cards than was
specified for earlier PowerBook computers. Developers must follow the design
guidelines provided in the section “RAM Expansion Interface” on page 10 to assure
compatibility with the Macintosh PowerBook 165c and future models.
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WARNING
Do not exceed the design envelope shown in Figure 1-5. Cards that
exceed these specifications may damage the computer, and may be
incompatible with future PowerBook models.
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