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 !
Please consider donating your old computer / videogame system to Old-Computers.com or one of our partners from anywhere in the world (Europe, America, Asia, etc.).
I still have Dads old one floating around. Might have to dig it out se did it boots and reads the floppies.
Thursday 2nd June 2022
Knight (Australia )
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)
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
