Toshiba T-1000

Some dry facts:

• CPU:
  80C88 / 4.77 MHz.
• Memory:
  512 RAM / 256 ROM.
• Drive unit:
  built-in for 3.5'' floppy disks.
• Screen Supertwist:
  80 characters x 25 lines,
  graphics 640 x 200 or 320 x 200 pixels,
  rotating 180 degrees.
• Interfaces:
  RS232C,
  parallel port Centronics,
  port for connecting a color display (RGB),
  composite video output,
  port for external floppy disk drive.
• Operating system:
  MS-DOS 2.11
• Dimensions:
  310 x 280 x 52 mm (W x D x H).
• Weight:
  2.9 kg.
• Power supply:
  built-in nickel-cadmium battery,
  AC adapter / charger.

The T-1000 has no built-in hard drive, so MS-DOS is loaded from a ROM chip that is mounted in the DIP panel, which means it is upgradeable.

But, according to the information I know, there was no upgrade. But on Microsoft's FTP there is an interesting document, dated 2000, telling about the launch of newer versions of MS-DOS.
The lack of a hard drive has its advantages – at that time, this model worked for 5 hours on battery power.

Let's take a look inside:

The top cover is removed together with the display:

The “flop drive” of the “thousander” is non-standard, the cable is smaller and there is no separate power supply:

Everything except CMOS and RAM is soldered to the board:

Needless to say, the machine was just right for 1987. To my great regret, I couldn't get my copy up and running – the double-sided board doesn't allow access to the components.
By the way, Toshiba has its own website for the T-1000 chapter.
Some datasheets in one archive rghost.ru/41450509