IBM ThinkPad Power Series

The IBM ThinkPad Power Series (and subsequent IBM RS/6000 Model 860 Notebook) is a laptop series from the ThinkPad brand based on the PowerPC architecture. 
History.
The first PowerPC notebook released by IBM was the RS/6000 Model N40, which was developed together with Tadpole Computer. It was announced in March 1994. The start of the sale was announced in October 1994.
Specifications.
Most of the 800 Series laptops used the PowerPC 603e CPU, at speeds of 100 MHz, or 166 MHz in the 860 model, although the earliest 800 (Type 6020), the direct ancestor of the 850, used a 603 and was apparently only offered to developers. All units used SCSI-2 instead of IDE hard disks, and the ID of every SCSI device on the system could be configured in the cursor driven GUI-based BIOS. Another unusual aspect of the series is their unique startup chime, reminiscent of Apple Macintosh computers of the time.
The PowerPC ThinkPad line was considerably more expensive than the standard x86 ThinkPads — even a modestly configured 850 cost upwards of $12,000. On the other hand, the 800, 850 and 851 (and later the 860 and 861) were capable of supporting an optional web camera, one of the first commercially available webcams available on a laptop. These units could also record PAL and NTSC signals with onboard composite connectors, and the batteries contained internal processors to regulate power usage for optimized battery longevity.
Software.
All of the PowerPC ThinkPads could run Windows NT 3.51 and 4.0, AIX 4.1.x, and Solaris Desktop 2.5.1 PowerPC Edition. Many of these PowerPC operating systems and the corresponding compilers are very scarce and hard to find. However, it is also possible to run certain PowerPC versions of Linux on the 800 Series.
Models.
ThinkPad Power Series 800.
The ThinkPad Power Series 800 (6020)
ThinkPad Power Series 820.
The ThinkPad Power Series 820 has reported to run SuSE Linux and Windows NT 4.0 and that they are incompatible with Yaboot. The availability started at April 15, 1996.
ThinkPad Power Series 850.
The ThinkPad Power Series 850 (6042-G6D) has a motion video capture card and optional snap-in video video camera.
RS/6000 Notebook 860.
The IBM RS/6000 Notebook 860, sometimes incorrectly to referred as ThinkPad 860 can be seen as the successor of the ThinkPad 850.
RS/6000 N40.
These line have a predecessor model (RS/6000 N40 with 50 MHz PowerPC 601 CPU and with different design, based on a Tadpole platform), and the siblings of 851 or 860 models (RS/6000 851 and 860) also released.