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  · myoldmac.net · Vintage Apple Macintosh Computer ·

PowerBook 145b - Code Name: Pike's Peak

The PowerBook 145b replaced the PB 145. The PB 145 has an 8 MB memory ceiling (installed) , although you can go beyond that by using Virtual Memory. Another option is RAM Charger 8.1, which offers better memory management than the Mac OS. The 145B was discontinued in July 1994. The 140, 145, and 145B were the first PowerBooks to include an internal floppy drive. They have 10" black & white screens which are suitable for viewing text or spreadsheets, but are not really designed for viewing graphics.

The PowerBook 145B has a single motherboard expansion slot addressed along a 32-bit memory bus. This computer requires standard 100ns pseudostatic RAM modules (PSRAM) in either 2MB or 4MB capacities, as it shipped in a 4MB default configuration with one vacant expansion slot. While the PB145B accepts memory that is compatible with the earlier PB140, PB145, and PB170, it would be helpful nonetheless to mention the model number in the Comments field of the order form when purchasing PSRAM upgrade modules.

While the PowerBook 140, 145 and 170 all share a common motherboard architecture with 2MBs of soldered PSRAM and a 2MB PSRAM expansion card, the PB145B includes 4MB of soldered PSRAM, which enables expansion beyond 4MB without the necessity of wasting a 2MB PSRAM expansion card. The Motorola 68030 on the PB145B daughtercard runs at 25 MHz, but lacks a Motorola 68882 FPU. One peculiarity of the PB140, 145, 145B and 170-series is that they do not support SCSI Disk Mode. All four of these PowerBooks address memory along a 32-bit data path.

These PowerBooks were the first mass-distributed 'Books and were likely to be found in your local Circuit City or other computer store back in the early 1990's.

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