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H > HITACHI  > MB-6890 / Basic Master Level 3   


Hitachi
MB-6890 / Basic Master Level 3

This japanese computer seems quite powerful. The main board is located into the main case, under the monitor.

Inside this main case there are 6 expansion slots which is quite enough ! Thus a lot of expansion boards were available (disk, printers, 8088, Z80 boards, etc).

An interesting feature is that there's a little trap-door on the keyboard which reveals some cool control switches : a power switch, a text mode switch (80 / 40 columns), a reset button and volume control knob. Quite useful !

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Memory came in two sizes, 16k and 64k. Our School computer lab was full of these but only 2 had 64k in 1985/86 then replaced with IBM xt clones

          
Sunday 6th June 2021
Michael Schipp (Australia)

@Rusty, I would be interested in those cards. Do you still have the schematics?

          
Thursday 1st April 2021
Carlos Camacho (United States)

I designed a number of add-on cards for this computer in my teenage years - two floppy disk controllers, hard disk interface with networking, multifunction card with rtc, two ay-3-8910 psg chips and a spo256 speech chip along with two atari joystick ports and a z80 card to run cp/m. I still have those boards but not the computer. It was a very well made piece of hardware and very reliable - too expensive for me to buy at the time.

          
Thursday 26th May 2016
Rusty (Australia)

 

NAME  MB-6890 / Basic Master Level 3
MANUFACTURER  Hitachi
TYPE  Home Computer
ORIGIN  Japan
YEAR  1980
BUILT IN LANGUAGE  Hitachi Level-3 Basic Version 1.0 (Copyright Microsoft)
KEYBOARD  QWERTY full-stroke keyboard, separated numeric keypad, 5 function keys
CPU  Motorola 6809
SPEED  1 Mhz
RAM  48k ?
VRAM  16k
ROM  24k (Basic Interpreter)
TEXT MODES  80 x 28 / 40 x 25
GRAPHIC MODES  80 x 100 / 160 x 100 / 160 x 200 / 320 x 200 / 640 x 200
COLORS  8
SOUND  Unknown
I/O PORTS  6 expansion slots, RS232c, Tape-recorder
POWER SUPPLY  Built-in PSU
PERIPHERALS  Tape-recorder, printer interface board, light-pen, Chinese character ROM board, 8088 CPU board, Disk Interface board, Z80 CPU board, RAM expansion boards




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