yann64andClaude Opus 5.5
c913d792c4
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
94 lines
3.4 KiB
Markdown
94 lines
3.4 KiB
Markdown
---
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title: Hitachi MB-6890 / Basic Master Level 3
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categories:
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- Computers
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types:
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- Home Computer
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origins:
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- Japan
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years:
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- '1980'
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cpus:
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- Motorola 6809
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params:
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name: MB-6890 / Basic Master Level 3
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image: /media/museum/photos/hitachi_mb6890_2.jpg
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company: /companies/hitachi
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company_name: Hitachi
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specs:
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- label: NAME
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value: MB-6890 / Basic Master Level 3
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- label: MANUFACTURER
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value: Hitachi
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- label: TYPE
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value: Home Computer
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- label: ORIGIN
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value: Japan
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- label: YEAR
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value: '1980'
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- label: BUILT IN LANGUAGE
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value: Hitachi Level-3 Basic Version 1.0 (Copyright Microsoft)
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- label: KEYBOARD
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value: QWERTY full-stroke keyboard, separated numeric keypad, 5 function keys
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- label: CPU
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value: Motorola 6809
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- label: SPEED
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value: 1 Mhz
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- label: RAM
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value: 48k ?
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- label: VRAM
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value: 16k
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- label: ROM
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value: 24k (Basic Interpreter)
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- label: TEXT MODES
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value: 80 x 28 / 40 x 25
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- label: GRAPHIC MODES
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value: 80 x 100 / 160 x 100 / 160 x 200 / 320 x 200 / 640 x 200
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- label: COLORS
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value: '8'
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- label: SOUND
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value: Unknown
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- label: I/O PORTS
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value: 6 expansion slots, RS232c, Tape-recorder
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- label: POWER SUPPLY
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value: Built-in PSU
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- label: PERIPHERALS
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value: 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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tabs:
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- photos
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- links
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photos:
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- title: MB 6890
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subtitle: ''
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text: ''
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image: /media/museum/photos/hitachi_basic_master_level3_mb-6890_3.jpg
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- title: THE KEYBOARD
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subtitle: ''
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text: Thanks to [Ueda's Page](http://www.japan-net.ne.jp/~a-ueda/oldcom/) for this picture
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image: /media/museum/photos/hitachi_mb6890_1.jpg
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links:
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- title: Ueda's Page
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url: http://www.japan-net.ne.jp/~a-ueda/oldcom/
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text: Lot of infos and pictures here ! (japanese)
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comments:
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- author: Michael Schipp (Australia)
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date: Sunday 6th June 2021
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text: 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
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- author: Carlos Camacho (United States)
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date: Thursday 1st April 2021
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text: '@Rusty, I would be interested in those cards. Do you still have the schematics?'
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- author: Rusty (Australia)
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date: Thursday 26th May 2016
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text: 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.
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oc_id: 2
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source:
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url: https://web.archive.org/web/20230413210407/http://www.old-computers.com/museum/computer.asp?c=2
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date: '2023-04-13'
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---
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This japanese computer seems quite powerful. The main board is located into the main case, under the monitor.
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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).
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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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