Apple 2400C manual RAM Expansion, Display, PC Card Slot

C H A P T E R 1

Delta Guide to the PowerBook 2400c Computer

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. ▲

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. ◆

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.

Features 5