Date   : Fri, 26 Nov 2010 21:47:33 +1100
From   : awilliams@... (Alan Williams)
Subject: Kansas City Standard (was: Electron Ferranti ULA)

I would be inclined to suspect that the 300 baud systems are using a
phase lock loop to decode the tones, while the BBC is squaring the
waveform up and digitally timing the pulse width.  A quick squint at the
KIM-1 circuit shows a LM565, Described by the NS sites as "Phase Locked
Look (Obsolete)"

With a lot of work writing code that understood the block format of the
foreign tape, so long as it used the same frequencies, you should be
able to read that on a BBC.  The BBC Tape filing system won't do this
for you though.  It expects the data on the tape to be in its format.

You may have to adjust the azimuth on the tape head, some tapes were
pretty fussy about being played back on the tape deck they were written
on.

It makes me wonder if you could wire two such systems back to back and
use the Beeb as a virtual tape player.  You could probably assemble code
for a KIM-1 on a BBC and save it between machines over the cassette
ports.  I am guessing that this has probably been done to death already
with PC sound cards.

I am not rushing of to try that though.

Alan


-----Original Message-----
From: bbc-micro-bounces+awilliams=linkme.com.au@...
[mailto:bbc-micro-bounces+awilliams=linkme.com.au@...] On
Behalf Of Dethmer Kupers
Sent: Friday, 26 November 2010 7:17 PM
To: bbc-micro@...
Subject: Re: [BBC-Micro] Kansas City Standard (was: Electron Ferranti
ULA)

> While I haven't had any opportunity to research further, to which 
> degree would it be possible to load data (text, probably not 
> executable programs) from a foreign computer on the Acorns?
See http://en.wikipedia.org/wiki/Basicode.

Greetings,
Dethmer.


_______________________________________________
bbc-micro mailing list
bbc-micro@...
http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro