Apple Macintosh PowerBook 2400c - Manual (Page 15)

C H A P T E R 1
Delta Guide to the PowerBook 2400c Computer
Features 5
RAM Expansion 1
The PowerBook 2400c computer accommodates one SO (small outline) DIMM for RAM
expansion. The DIMM can have either 16 or 32 MB of additional RAM.
The mechanical characteristics of the RAM expansion DIMM are given in the JEDEC
specification for the 144-pin 8-byte DRAM SO DIMM. The PowerBook 2400c computer
can accommodate an SO DIMM with a height of 1.0, 1.25, or 1.5 inches.
While the JEDEC specification for the SO DIMM defines a Serial Presence Detect (SPD)
feature that contains the attributes of the module, the Macintosh PowerBook 2400c
computer does not support the SPD feature. The computer requires the DIMM to contain
EDO DRAM devices with access times of 60 ns or less.
The electrical characteristics of the DIMM must be the same as those of the RAM
expansion module for the PowerBook 3400 computer, as described in the PowerBook
3400 Developer Note. To obtain that developer note, please refer to “Supplemental
Reference Documents” on page vii.
IMPORTANT
Unlike the RAM expansion module for the PowerBook 3400 computer,
the SO DIMM for the PowerBook 2400c computer does not require an
address buffer.
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Note
The PowerBook 2400c computer can accept a DIMM that uses
64-megabit DRAM devices. The electrical characteristics of such a
DIMM must be the same as those of the corresponding expansion
module for the PowerBook 3400 computer: the DRAM devices must be
4 M by 16-bit devices with 12-by-10 address multiplexing, and the
connections to device address bits 9 and 10 must be swapped on the
DIMM.
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Display 1
The Macintosh PowerBook 2400c computer has a built-in color flat panel display. The
display is 10.4 inches across (measured diagonally) and is backlit by a cold-cathode
fluorescent lamp. The display contains 800 by 600 pixels and can show up to thousands
of colors.
Like the display in the PowerBook 3400, the display in the PowerBook 2400c computer
uses active matrix (TFT) technology for high contrast and fast response.
PC Card Slot 1
The PC Card slot accepts either one Type III card or two Type II cards. The card eject
mechanism uses a small motor, unlike the card eject mechanism in the PowerBook 3400,
which uses a Nitinol wire.