IBM PS/2 Note

The IBM PS/2 Note (stylized as PS/2 note or PS/note) is a series of notebooks from the PS/2 line by IBM. It was announced in March 1992, half a year prior to the release of the first ThinkPad, the IBM ThinkPad 700. The series was discontinued in 1994.
Background.
After the departure of Bob Lawten from IBM, the team at IBM had little development direction after the IBM PS/2 L40SX. James Cannavino pushed for the new notebook series, which fell behind schedule. The N45SL, N51SX and N51SLC were announced on the same day as the IBM PS/2 (color laptop) CL57SX. During this time there was a distinction between notebooks and laptops, where the former are A4 sized and the latter are larger. 
The notebooks were modeled after the PS/55 Note which was released by IBM in Japan in April 1991.
Models.
PS/2 Laptop.
Heavy desktop replacement line.
PS/2 note.
Mainstream line with 7-row layout only. 
N33SX.
The "PS/2 Model N33 SX" (also known as "PS/2 note N33 sx") was the first notebook-sized computer from IBM which was announced in 1991. This model was based on the AT-bus and had between 2 or 6MB RAM. It has a 9.5" 16-greyscale VGA LCD, a 1.44Mb floppy and expansion ports and a 40Mb or 80Mb HDD, and weighs .
N51SX.
The "PS/2 Model N51SX" (or "PS/2 Note N51SX") was a low-end mainstream notebook, which contained a slower version of the typical 386SX found in other notebooks. The N51SX was delayed for months.
N51SLC.
The "PS/2 Model N51SLC" (or "PS/2 Note N51SLC") was based on IBM their 368SLC. This model has a PS/55 note sibling.
PS/note.
Entry-level line.
N45SL.
The "PS/Note N45SL" was priced at $2,045 and contained a 25MHz 386SL. It had 2MB RAM and a 80 or 120MB HDD and was equipped with only 6-row keyboard without dedicated navigation block; the similar layout has a low-end ThinkPad 300 laptop.
"PC Mag" considered the display a disappointment, but noted its good design and performance.
It was manufactured by Zenith Data Systems.
182/E82/N82.
The "PS/Note 182" and "PS/Note E82" was equipped with 80386SL CPU, "PS/Note N82" was equipped with 80386SX and released in 1992. This line has a 7-row keyboard layout and similar to next-year PS/note 425 model case (but with gray case color and without TrackPoint).
Model 425/425C.
The "PS/Note 425/425C" are identical to the ThinkPad 350/350C.
Accessories.
Communication cartridge
Communication cartridge II 
External floppy
External numpad
Discontinuation.
In March 1994, it was reported that IBM would consolidate the PS/Note series into the ThinkPad 300 series. In 1994, the ThinkPad 360 series was released.