The PowerBook 150 was the last of the classic 100-series PowerBooks, released in 1994. It replaced the 145B at the low end, and was in interesting mixed bag of features and drawbacks overall. It was a 100-series laptop in name and external design only really, it was a Duo 230 on the inside. Being based on Duo architecture, it notably could address up to 40MB of RAM, compared to at most 14MB in all other 100-series PowerBooks, even the top-end 180c. This also meant that it could even address more RAM then the then top end 540c, 40MB compared to 36MB. However, this one advantage came with the big drawbacks of an especially poor quality LCD, worse in my opinion than the 145's panel, and a lack of external I/O. All it had was a single serial port, SCSI, and an optional modem. Audio out/in, a second serial port, and notably, ADB were all left off. It also had no video out, but neither did the 145.
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