Lexmark Lexbook MB10

I recently found a Lexmark "Lexbook MB10", which is an interesting 8088 laptop.

Screen:     monochrome 80x25 (?), 8.25" diagonal
Speed:      user-varied, up to 10 MHz (?)
Power:      12v DC, 0.8 amp, positive tip
RAM:        1280K (uses about 704K for MSDOS, the rest is RAM disk?)
Mouse:      built-in mini-mouse, uses a mouse "key" (sort of like a joystick)
            (see lower right corner of keyboard).
            keyboard has left and right click buttons (left of spacebar).
Ports:      one 9-pin Serial; one 25-pin Parallel; earphone jack
PCMCIA:     two type I (or II?) (configured as drives A and B)
Battery:    internal Ni-Cad; three button (CR-22?)
Indicators: LCD strip above keyboard with seven indicators:
               B drive access, Caps Lock, Num Lock, Scroll Lock, 
               button batteries low, main battery low, and A drive access.
ROM software:
            PowerPad Systems BIOS 1.08 (1995)
            PacRim parallel-port floppy driver
            MS-DOS Version 5.00
            Stacker (?)
            ?

Sticker on bottom:
   Model No:   MB1378519 (or: MB1878519? (second digit smudged))
   COMPUTER 12 VDC 0.8A
   Serial No:  000xx     (two digit serial number!)
   08-Feb-94   MADE IN USA
   FCC ID. IYL1378519

The bootup also says "running on MiniBook PC".

My Lexbook came with a 1 MB PCMCIA memory card in drive B, which has a set of software (word processor, InstaCalc). (more later)

Note: this appears to be a different machine than the Lexbook SE10.

The only known page at www.lexmark.com that has any reference to any Lexbook is http://www.lexmark.com/canada/corporate/year2000.html, which says:

LEXBOOK Computers Lexmark notebook and sub notebook computers have not been fully tested, therefore, by definition are not year 2000 compliant. Customers should not use them in any critical application after Dec. 31, 1999. Given that these products were all withdrawn from manufacturing and marketing some time ago, Lexmark expects most users have already migrated to more current products. In any case, Lexmark recommends that users still using Lexmark Lexbook computers replace them with year 2000 compliant devices.