26 Feb
2008
26 Feb
'08
7:34 p.m.
From: cclist at sydex.com
David Griffith wrote:
Hi
For the high speed cassette, the Poly88 used manchester encoding.
It is like a pushed to the limit FSK more more correctly phase
encoding.
Dwight
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This paper tape fiddling made me wonder if anyone
ever made a cassette
tape interface that emitted RS232 signals and looked to the computer
like a paper tape reader/writer.
Definitely. I used a lovely Techtran dual-cassette unit before I had
a floppy drive for my MITS 8800. Buffered in 128-byte blocks, fully
searchable and block-addressable. Used as a replacement for an ASR
tape unit--it understood XON and XOFF control codes. Baud rates to
2400, IIRC.
These were fairly common at one time in CNC applications, such as
embroidery and machining before they were replaced by floppy-disk
paper tape emulators.
Data was recorded as NRZ rather than FSK, however.