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==== PS/55 note N23 SX ====
This was a second generation PS/55 Note type 5523-S1x with N23 SX added to it's 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 accomodate 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 |url-status=live |website=Ret Rocks}}</ref>.
==== PS/2 note N33 SX ====
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