PowerBook 140/145-series


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The PowerBook 140/145-series has a single motherboard expansion slot addressed along a 32-bit memory bus. This computer requires unique 100ns pseudostatic RAM modules (PSRAM) in either 2MB, 4MB, or 6MB capacities, as it typically shipped in a 2MB default configuration with one vacant expansion slot. When ordering PSRAM for this PowerBook, please mention the model number in the Comments field of the order form.

With 2MB PSRAM soldered to the logic board, the PB140/145-series is bootable out of the box. The addition of a single 2MB, 4MB or 6MB expansion module yields memory configurations of 4MB, 6MB, and 8MB. The maximum amount of usable memory in the PB140/145-series is 8MB, in the form of a single 6MB module in combination with the soldered 2MBs of logic board PSRAM.

The PowerBook 140, 145 and 170 all share a common motherboard architecture, but have distinct daughtercards. The Motorola 68030 on the PB140 daughtercard runs at 16 MHz, for example, and 25 MHz on the PB145. Neither the PB140 nor the PB145 daughtercards include math coprocessors, in contrast to the PB170, which features a Motorola 68882 FPU. All three of these PowerBooks address memory along a 32-bit data path.

Specifications
Logic Board PSRAM		2MB.
Supported Modules		2MB, 4MB,6MB.
Number Expansion Slots		One (1).
Supported VRAM		None.
Number VRAM Slots		None.
L2 Cache Supported		None (Non-PowerPC architecture).
Module Type		100ns Pseudo Static RAM (PSRAM) Card.

While some of the products mentioned on this page may no longer be available, the information about these products remains available to those who may need it.

Be sure to mention the model number in the Comments field of the Ordering Form
when ordering upgrade modules from MacGurus.