website/content/museum/hitachi-mb-6890-basic-master-level-3.md

title, categories, types, origins, years, cpus, params

title	categories	types	origins	years	cpus	params
Hitachi MB-6890 / Basic Master Level 3	Computers	Home Computer	Japan	1980	Motorola 6809	name image company company_name specs tabs photos links comments oc_id source MB-6890 / Basic Master Level 3 /media/museum/photos/hitachi_mb6890_2.jpg /companies/hitachi Hitachi label value NAME MB-6890 / Basic Master Level 3 label value MANUFACTURER Hitachi label value TYPE Home Computer label value ORIGIN Japan label value YEAR 1980 label value BUILT IN LANGUAGE Hitachi Level-3 Basic Version 1.0 (Copyright Microsoft) label value KEYBOARD QWERTY full-stroke keyboard, separated numeric keypad, 5 function keys label value CPU Motorola 6809 label value SPEED 1 Mhz label value RAM 48k ? label value VRAM 16k label value ROM 24k (Basic Interpreter) label value TEXT MODES 80 x 28 / 40 x 25 label value GRAPHIC MODES 80 x 100 / 160 x 100 / 160 x 200 / 320 x 200 / 640 x 200 label value COLORS 8 label value SOUND Unknown label value I/O PORTS 6 expansion slots, RS232c, Tape-recorder label value POWER SUPPLY Built-in PSU label value PERIPHERALS Tape-recorder, printer interface board, light-pen, Chinese character ROM board, 8088 CPU board, Disk Interface board, Z80 CPU board, RAM expansion boards photos links title subtitle text image MB 6890 /media/museum/photos/hitachi_basic_master_level3_mb-6890_3.jpg title subtitle text image THE KEYBOARD Thanks to [Ueda's Page](http://www.japan-net.ne.jp/~a-ueda/oldcom/) for this picture /media/museum/photos/hitachi_mb6890_1.jpg title url text Ueda's Page http://www.japan-net.ne.jp/~a-ueda/oldcom/ Lot of infos and pictures here ! (japanese) author date text Michael Schipp (Australia) Sunday 6th June 2021 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 author date text Carlos Camacho (United States) Thursday 1st April 2021 @Rusty, I would be interested in those cards. Do you still have the schematics? author date text Rusty (Australia) Thursday 26th May 2016 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. 2 url date https://web.archive.org/web/20230413210407/http://www.old-computers.com/museum/computer.asp?c=2 2023-04-13

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 !