Microbox II 6809 Single Board Computer
The Microbox II single board computer was a product of Micro Concepts in England,
and was designed by Dave Rumball.
The Microbox II featured:
- 1-2 MHz 68B09E microprocessor
- 60KB DRAM (supported by a 6883/SAM chip)
- 8KB EPROM (4KB mapped out when running FLEX)
- 2 RS-232 serial ports (WD2123 DUART)
- parallel printer port (buffered)
- parallel keyboard port
- time-of-day clock/calendar (146818) with on-board trickle-charged battery
- monochrome video display (NEC 7220A controller): text (84x24 or 108x24),
graphics (768x576) with drawing and fill commands
- 128KB DRAM shared by video display and RAM-Disk
- 64KB EPROM-Disk plus on-board EPROM programmer
- single/double-density floppy disk controller (WD1770) for 2 drives
- 50-pin user expansion bus (buffered)
- 9.5" x 12.0" PCB (2-layer, no soldermask or silkscreen)
- FLEX operating system supported
- cost U$190 for a bare board plus monitor in EPROM and system disk
At first the only information I could find on the Microbox II was from
an ad in '68' Micro Journal on page 56 in the
issue. But in March 2020 a member of the
SS50 & SS30 Computer Bus Chat Facebook group page posted a picture of
his Microbox II, and another member pointed me to additional information.
Just a few weeks later I found another Microbox II owner in South Africa who has
board. Thanks Jarmo and Nadim and Wouter!
The Microbox II was featured in a series of articles in the UK edition of
Electronics Today International (ETI) magazine:
(Click on a picture for a larger version.)
|Picture of top side (168KB .jpg).
||UK 68 Micro Group disks for the Microbox II.|
(3 .dsk files in 40T/SS/SD FLEX format, 80KB .zip)
"FLEX" was a trademark of Technical System Consultants (TSC).
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Last revised 2020-Apr-25 21:47 PDT.
Copyright 2020 by David C. Wiens.