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{{Short description|Laptop by IBM}}
{{Infobox computing device
| name = IBM PS/2 Note and PS/note
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| discontinued = 1994
| cost =
| type = [[Notebook
| processor = [[Intel 386]]
| frequency =
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| dimensions =
}}
The '''IBM PS/2 Note''' and '''PS/note''' are a series of [[Notebook
== Background ==
After the departure of Bob Lawten from IBM, the team at IBM had little development direction after the [[IBM PS/2 L40 SX]]. James Cannavino pushed for the new [[Notebook
The notebooks were modeled after the [[IBM PS/55 Note|PS/55 Note]] which was released by IBM in Japan in April 1991.<ref>{{cite magazine|last1=Scannell|first1=Ed|date=23 Dec 1991|title=IBM readies 6 portables|url=https://books.google.com/books?id=FT0EAAAAMBAJ|magazine=[[InfoWorld]]}}</ref>
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== Models ==
{| class="wikitable mw-collapsible mw-collapsed" style="min-width:40%";
! colspan="6" |IBM PS/55 note, PS/2 note, and PS/note
|-
!
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! colspan="2" |
|}
=== PS/2 note ===▼
Simply branded as PS/55 note, the type 5523-S0x was the first Japanese notebook from the 55-series with a 12Mhz 80386 CPU, 2Mb RAM built in and a 9.5" 16-greyscale VGA LCD (640x480). It was only released in Japan. The two main planars inside consisted of two separate boards "APEX-MAIN" and "SUB-BOARD" leaving room inside for either a floppy drive or a hard drive - but not both. The keyboard has a 7-row layout only. It was not common for IBM to add codenames or words to their internal PCBs, suggesting some influence from outside IBM.
=== PS/55 note N23 SX ===
This was a second generation PS/55 note type 5523-S1x with N23 SX added to its case badge and also only released in Japan. This machine had a 16Mhz 80386 CPU and a redesigned motherboard consisting of just one planar. The additional space inside meant the machine could accommodate both an internal floppy disk drive and a hard drive. It also featured an external VGA output and display invert switch.<ref>{{Cite web |last=Maggs |first=Alexander |date=April 2025 |title=IBM PS/55 Note N23 SX (5523-SC4) - Japan |url=https://ret.rocks/index.php/ibm/early-ibm-portables/ps-55-note-n23-sx |website=Ret Rocks}}</ref> The main planar inside has "EXCEL-MAIN" written on it.
▲=== PS/2 note N33 SX ===
[[File:IBM_PS2_N33.jpg|thumb|IBM PS/2 Note N33 SX with external [[floppy drive]]]]
The ''PS/2 Model N33 SX'' (also known as ''PS/2 note N33 SX'') was the first Western-released notebook-sized computer from IBM which was announced in 1991.<ref>{{Cite web|title=IBM PS/2 Note - Computer - Computing History|url=http://www.computinghistory.org.uk/det/30500/IBM-PS-2-Note/|access-date=2021-04-20|website=[[The Centre for Computing History]]}}</ref> This model was based on the AT-bus and had between 2 or 6MB RAM. It has a 9.5" 16-greyscale VGA LCD (640x480),
A joint third generation PS/Note took the ISA-bus N23SX and added a 10.4" colour TFT panel from the CL57, but successfully miniaturised to fit within the smaller notebook lid. They were branded 'Thinkpad' on the colour IBM logo.<ref>{{Cite web |title= PS/55note C23V (5523-V2/VJ)|url=https://www.ardent-tool.com/PS55/5523/5523-V2.html |website=Ardent Tool Of Capitalism}}</ref>
The ''PS/2 Model N51 SX''<ref>{{Cite web|title=Personal System/2 Models N51 SLC and N51 SX|url=https://www.ardent-tool.com/docs/pdf/brochures/ibm-ps2-modeln51-slc&sx.pdf}}</ref> (or ''PS/2 Note N51 SX'') was a low-end mainstream notebook, which contained a slower version of the typical 386SX found in other notebooks. The N51 SX was delayed for months.<ref name=":1">{{Cite book|last=Fitzgerald|first=Michael|url=https://books.google.com/books?id=ioRslYZXVkAC|title=Going down in history|date=1992-03-30|work=[[Computerworld]]|publisher=IDG Enterprise|pages=38|language=en}}</ref>▼
▲The joint third generation ''PS/2 Note N51 SX'' (or ''PS/2 Model N51 SX''<ref>{{Cite web|title=Personal System/2 Models N51 SLC and N51 SX|url=https://www.ardent-tool.com/docs/pdf/brochures/ibm-ps2-modeln51-slc&sx.pdf}}</ref>
The ''PS/2 Model N51 SLC'' (or ''PS/2 Note N51 SLC'') was based on IBM their [[IBM 386SLC|368SLC]].<ref name=":1" /> This model has a [[IBM PS/55 Note|PS/55 note]] sibling.<ref>{{Cite web|title=PS/55note N51SLC 8551-S08|url=http://www.mars.dti.ne.jp/~ayase/tp/ps55n51slc.htm|access-date=2021-05-18|website=www.mars.dti.ne.jp}}</ref>▼
=== PS/2 note N51 SLC ===
▲The ''PS/2
[[PCMag|''PC Mag'']] considered the display a disappointment, but noted its good design and performance.<ref name=":0" />
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It was manufactured by [[Zenith Data Systems]].<ref>{{Cite web|title=PS/2 Model N33 SX|url=https://www.ardent-tool.com/8533/8533.html|access-date=2021-04-19|website=Ardent Tool of Capitalism}}</ref>
The T22 SX is an unusual non-backlite greyscale tablet and detachable keyboard offshoot from the main note range. It sold in small numbers.
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 [[Pointing stick|TrackPoint]]).▼
=== PS/note 182/E82/N82 ===
▲
The ''PS/note 425/425C'' are identical to the [[IBM ThinkPad 350|ThinkPad 350/350C]].<ref>{{Cite book|url=https://download.lenovo.com/ibmdl/pub/pc/pccbbs/bp_thinkpad/tpvol1.pdf|title=Hardware Maintenance Manual Volume 1: Laptop, Notebook, Portable and ThinkPad Computers|pages=205}}</ref>
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== Discontinuation ==
In March 1994, it was reported that IBM would consolidate the PS/note series into the ThinkPad 300 series.<ref>{{cite magazine|url=https://books.google.com/books?id=DTsEAAAAMBAJ|first=Yvonne|last=Lee|title=IBM revamps line with four ThinkPads|magazine=[[InfoWorld]]|date=21 March 1994 }}</ref> In May 1994, the [[ThinkPad 360]] series was released.
== Timeline ==
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{{IBM personal computers}}
[[Category:IBM laptops|PS
[[Category:Computer-related introductions in 1992]]
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