Re: petSD project page

From: Anders Carlsson <>
Date: Mon, 20 Jun 2011 16:50:23 +0200
Message-ID: <37C24050426C4B61A6BF07E28A42F065@ryds>
Olaf "Rhialto" Seibert wrote:

> 4 PETs connected to a single 4040 disk drive and a 4023(?) printer using 
> metres long custom IEEE cabling that was chained from computer to computer 
> and finally to the disk drive and printer.

Yes, I think this is known as PET-switch, MBS-xxxx (I forgot the actual 

When I rescued PET systems a couple of years ago, I came across a couple 
such setups. They appeared to consist of one master unit to which you 
connected the floppy drive, hard disk, printer etc. This master unit 
connects to your first PET in the chain, then you use 25-pin flat cable to 
chain to a daughter unit connected to the next PET in chain, and then 
another length of cable to the next daughter unit. I'm unsure if there was 
any need of termination or if the last PET somehow connected to the master, 
but I don't think so?

The Corvus constellation multiplexer however appeared as a star topology, 
where users would connect their Hardboxes by one cable each to the 
multiplexer which in its turn would connect to a Corvus hard disk.

Nowadays, those who have multiple PET systems set up probably can afford one 
petSD or other device to each so no real need to daisy-chain all computers 
to one poor memory card device. :-)

Best regards

Anders Carlsson

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Received on 2011-06-20 15:00:29

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