🚀 go-pugleaf

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Repeatedly during the past few months I have come across C source
specifically for MS-DOS systems, which used names such as
"/dev/con" for the console device, most recently in the latest
issue of DDJ (Oct 1986), in Alan Holub's listing of a "more"
program for MS-DOS.

I am aware that under UNIX, devices appear as files in the directory
/dev, but was unaware of a similar construct under MS-DOS.

Is this notation an undocumented feature of DOS, or a feature of
a particular C compiler, or is it simply an error?

An unrelated question:

Can anyone point me to a source of data cassettes for the Everex
Stream-20 tape drive? These are not your usual data cartridges, 
but look like normal Compact Cassettes, with a 1/4 inch notch
slightly off-center in the rear edge. They hold about 20MB of data,
and I know they are available from PC Network for about $30; however,
I would like both a cheaper and if possible faster source than 
PC Network.
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