Sanyo MBC-16LT

Released in late 80s this computer was known as very light, and indeed its weight is smaller than similar Toshiba T1200 or Bondwell units. It has Intel 80C88 CPU and 640kB of RAM, two 720kB floppy disk drives and no expansion capabilities except "expansion connector" not soldered to mainboard. Its non-backlit LCD has only 80x25 text mode compatible with MDA (monochrome graphics card). It was a bit cheaper than similar units of known brands.

Manufacturer Sanyo

Origin Japan
Year of unit 1988
Year of introduction 1988?
Type Laptop, PC
CPU Intel 80C88, 8MHz
RAM 640kb
Floppy Disk 2x 3.5", 720K
Hard Disk None
Other media None
Graphics and display: MDA, Monochrome non-backlit LCD.
Sound: PC Speaker
Keyboard and pointing device: Full-stroke PC keyboard without numeric part and most control keys (moved to second functions of other keys)

Power supply:

1 - Ground
2 - +10V DC, 1A
(Because it goes right to mainboard avoid using bigger voltage)

I/O:  - Serial port
 - Parallel port
 - DB9 video out
Possible upgrades:  None known
Additional peripherals:   

My unit has blown power supply unit, but it should just boot through simple BIOS from floppy.

 ROM dump

[Update: 2017-02] Battery connector

Battery connector is 3-pin, in my unit it it was Power, GND, Power (Red-black-red) - so it's not easy to plug it wrong way, power wires are both soldered to + of the battery. The battery information is in the photo below: