...adds a 6809 second processor...
Written on January 26th, 2026 by Tech Ads
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CUBE BeebFLEX - 6809 Second Processor
for the BBC Microcomputer
CUBE BeebFLEX adds a 6809 second processor to the
BBC Microcomputer running FLEX, the international
standard 6809 disk operating system. It is supplied complete
with 6809 CPU, 64KB DRAM and supporting monitor ROM.
CUBE BeebFLEX is housed in a self-powered beige metal
enclosure. Two CUBE/Acorn bus sockets are spare for extra analog
or digital i/o, hi-res colour video, or EPROM programming. Larger
CUBE Euroracks are available. The unit runs industry-standard 40 or
80 track FLEX disks via the BBC Microcomputer. Connection to the
BBC Micro is via the TUBE. It uses the standard BBC Micro disk
interface and disk drives, which remain valid for standard BBC Micro
Purposes.
CUBE BeebFLEX can run a wide variety of FLEX programs - including macro-assemblers and cross-assemblers, compilers and
cross-compilers, and high-level languages, including PL/9, ‘C’ and Extended BASIC. CUBE BeebFLExX is particularly suitable for
machine code assembly both to 6809 and, via cross-assembly, to other microprocessors - including 68000.
FLEX is the only truly machine-independent operating system for 8-bit processors. The 6809 microprocessor has more
instructions, more registers and more addressing modes than the 6502. It also generates relocatable code. As a result FLEX is
particularly suitable for development applications.
CUU0990 CUBE BeebFLEX 6809 Second Processor Unit £358.80 ex. VAT
FLX0910 FLEX operating system disk, with manual £65.00 ex. VAT
Andersons Court, Newnham Road, Cambridge CB3 9EZ.
Tel: Cambridge (0223) 358757, Telex: 995801 GLOTX-G.
Please ask for further details of CUBE BBC Eurocard extensions, and the entire CUBE range.
- Manufacturers of the CUBE Range
Control Universal Lt of Industrial Microcomputer Systems b y
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‘…adds a 6809 second processor…’
The CUBE BeebFLEX from Control Universal was an enclosed with a second processor for the BBC Micro. Based around a Motorola 6809 CPU running 1Mhz, 64KB of ram, and a TUBE interface to the host micro, the enclosure also included a number of unused slots to store further hardware upgrades such as video output or an EPROM programmer. Programs run on the BeebFLEX’s CPU were able to access the host micro’s floppy disk drive and the 6809 CPU was able to copy RAM values to and from the BBC’s own system RAM. The primary targeted use of this hardware was to run FLEX - a mono-tasking operating system by Technical Systems Consults (TSC) - and the FLEX OS’s library of software.
The BeebFLEX was available for around 358.80GBP plus VAT. FLEX was also available at the same time for 65.00GBP plus VAT.
A promotional brochure for the CUBE BeebFLEX can be found at TheOddys.com. A positive review of the CUBE BeebFLEX can be found in the March 1985 issue of AcornUser.
Taken from: Practical Computing - Volume 7, Issue 6 (June 1984)