In my cases besides those examples of logic, I am trying to find a very old by the standards of today, but certainly appropriate for this list, handheld. It was designed either by, or for, the OEM behind Seiko, sometime during the early part of the 1990s, about the time two things happened, one was the sudden importance of being able to collect data via handhelds, that of barcodes, and that those bounders at Microsoft released their MSDOS6.22 to the embedded device market. That market did nothing with that OS as they were waiting to evolve for a different OS altogether. It would have been traveling with an SDK for the methods, and even an appropriate laptop since the thing used PCMCIA cards for storage of data.
The totally sexy but possibly not very useful HP-95LX / 100LX / 200LX palmtops? They are DOS and IIRC had PCMCIA. The Atari Portfolio (See Terminator 2 and Parker Lewis Can't Lose) also ran MS-DOS, is pretty sexy, but had no PCMCIA. It uses a Mitubishi BeCard (HudsonSoft?) for storage. Those are the two that I know of that are MS-DOS. Was it a palmtop or a gun format? The HP's feel oh so nice. - Ethan