Date   : Thu, 18 Mar 1993 09:38:52 +0100
From   : stjohn@... (Chris StJohn)
Subject: BBC network

Hi. Just read this item on USENET. I remember a discussion about a cheap
BBC network and this looks like it fit the bill. The actual post is about
CP/M machines but then he talks about his network....

I"ve fairly heavily edited the original post....

  ,--,             Chris StJohn, LIX, Ecole Polytechnique, 91128
 /    /_  __' _    Palaiseau, Cedex, FRANCE. (+33) 1.69.33.45.93
(____/ (_/ (_/_).
                   Don't mean they're not after you" -- Nirvana

Article: 3901 of comp.os.cpm
Reply-To: ec_ind03@... (William Jhun)
Organization: Instructional Computing Center, SUNY at Oswego, Oswego, NY

We are conducting an experiment which involves a parallel network at which
data can be x-fered at high speeds. The process is quite simple. So far we
have linked IBMs, Amigas, and Commodore 64s up to this experimental
network. Between two lowly C64s, data can be transfered at around 32k/sec.
Speeds will increase with faster computers.

The point of the project is to provide a useable network between a wide
range of computers, large and small, with a minimal price tag.

The process is quite simple. Each computer requires
an 8-bit (which should have handshaking lines, to add up to ~9 lines or
more) bi-directional port (usually through a parallel port, where using a
serial port faults on the RS-232s unusual -12/+12v signal, so we are
trying to keep a moderate +5/0v TTL signal. The network will have 9-12 lines
connected between each computer. 8-data, and other handshaking. The
process to be proposed may need a little modification relating to the fact
that if one computer crashes in the original design, the network chokes.
The simple idea would be one computer sending a packet to another, with an
ID header, etc, while that computer will bypass it to other computers if
it is not the one receiving it. (this also leads to a big problem of
security, but we have more advanced designs finished and pending)

William Jhun   (ec_ind03@...)

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