But how does one go about installing OS/2 on a ThinkPad T42p? The machine has more than 512 MB of memory, therefore one cannot install directly from the CD. One must first make three installation diskettes, change a couple of files to include fixes for machines with more than 512 MB of memory, and boot from floppy. But the T42p doesn't have a floppy drive. Now, it does have a USB floppy drive, however, so by adding USB support to diskette 1, according the instructions given in the USB packages, one would think that it would work. But just after it loads the IBM1S506.ADD driver, OS/2 complains that it can't operate the hard disk or diskette.
Trevor says that OS/2 will boot on some ThinkPads from a USB floppy, FWIW.
Anyway, perhaps you can find whatever needs to be changed on the 3 floppies that Dave mentioned. You probably have a better idea of what you need than I do...
I've got ECS 1.1 that I've never used, and a May 2003 edition of the [link|http://xenia.sote.hu/~kadzsol/rexx/sajat/doc/wupdkit.htm|Warp Update Kit]. Would either solve your problem?