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This is one of three N45 SL machines I have in a box. I previously gave up a day and ended up with one complete boxed one, a second unboxed one as a nice working companion and a third 'parts' machine. The N45 came in two models sporting different CPUs - the SL and SX.
You'll notice the case badge has similarities to both the 2141 (a PS/1 type) PS/note 182 and the PS/1 case badge - unlike the other PS/note and IBM Thinkpad oval badges, you'd think it is architecturally closely related to the (same year) PS/Note 182. However this machine feels Zenith-made through and through - much like the Thinkpad 300 which usurped it as the 2615. It shares a similar case plastic, power brick, display, keyboard and battery. Perhaps IBM were briefly marketing the N45 as the low-end (outsourced) notebook and the N51 as the high end (IBM-built) notebook, which eventually became the Thinkpad 300 as low-end and 700 as high.
Putting it another way, IBM were obviously toying with what to do about the cost-reduced 'low end' and had the 2141 "Lexmark Lexbook AR-10" PS/note and the Zenith-made N45 SL then "Zenith Z-Note 433Lnc+" 300 all coming out at once. You'll find some very reputable sites not even acknowledging the 2141 or 261x machines because they do not follow the 'true bloodline' of the IBM notebooks. The N45 SL may well have a Zenith step brother, but I haven't found a reference to it.
My first machine amazingly has a i387 upgrade chip (a maths coprocessor for the 386) fitted.
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N33 is derided from the 8533 Model Type. Yeah, IBM had some really snappy titles back before the Thinkpad.
Note: this article is about the 12Mhz 386 model which was seemingly derived from the first generation PS/55 Note, whereas the 16Mhz version was derived from the second generation PS/55 Note which was called the N23 SX. Inside it's a completely different motherboard to the 16Mhz with no external display, no invert display switch and no built in floppy because the two-part construction of the main two boards leave no room for the Hard Drive to mount on top of them - therefore it's moved to take up the space of the floppy drive. I believe it was an option to have either a HDD or a FDD and my one has the HDD option with FDD connected via the external connector.