Macintosh PowerBook 150
The PowerBook 150 was introduced in July 1994 and discontinued by October 1995. It was designed to be a mid-level laptop like the PowerBook 140/145 models.
The PowerBook 150 computer retains the physical appearance of the PowerBook 145B computer except that it houses a logic board built upon the PowerBook 200 series system architecture. This new logic board not only increases the processing performance of the PowerBook 150, but also allows for greater flexibility of RAM expansion. In addition to the increased performance and new RAM expansion capabilities, the PowerBook 150 also incorporates an internal IDE drive, rather than an internal SCSI drive.
The PowerBook 150 uses a Motorola 68030 clocked at 33MHz. There is no math co-processor in this model.
The PowerBook 150 includes 4MB RAM onboard, expandable to 36MB (single memory slot). The RAM expansion slot accommodates Macintosh Duo system RAM expansion cards up to a total of 40 MB of RAM.
Liquid crystal display: film super twist nematic (FSTN) 2-bit-per-pixel (4-level) grayscale, 640-by-480 pixels, with adjustable backlighting.
The PowerBook 150 video display is a 9.5-inch flat panel film super twist nematic (FSTN) dual-scan liquid crystal display (LCD). It provides 640-by-480 2-bit per pixel resolution, is capable of displaying 4 levels of gray, and has on-demand cold cathode fluorescent lamp (CCFL) backlighting. The video implementation on the PowerBook 150 is similar to the video on the PowerBook Duo 230. The video RAM is a 128K x 8-bit device that stores the data required to update and refresh the flat-panel video display.
The implementation of the ATA interface on the PowerBook 150 computer is a subset of the ATA interface specification, ANSI Proposal X3T9.2/90-143, Revision 3.1. The controller hardware in the PowerBook 150 supports direct memory mapped programmed I/O transfers only and does not support DMA transfers. The IDE drive interfaces with the PowerBook 150 main logic board through a 44-pin connector on the end of a ribbon-cable. The connector on the controller electronics of the IDE drive is a standard ATA 40-pin configuration. The PowerBook 150 IDE interface connector has 4 additional lines, which provide ground and +5 volts of power to the drive.