1st stage loader for IMSAI - need ascii to binary conversion

John Floren slawmaster at gmail.com
Tue Feb 26 15:42:51 CST 2008

On Tue, Feb 26, 2008 at 11:57 AM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
> >     Easy path: two tone detectors, going to a microcontroller who store the
>  > data read from the tape and send it in RS232 way. A very simple AVR
>  > microcontroller can do that ;o)
>  Argh!. I grew up learning to design solutions to problems, rather than
>  throw microcontrollers at them in the hope they'd go away.
>  For the standard 1200/2400Hz cassette tones, there's a very simple
>  circuit using a pair of monostables (one-shots) -- IIRC a single 74LS123
>  chip will do -- that does the decodning from the tones to a bitstream.
>  BTW, if you've got tone detectors (presumably one tuned to the '1' tone,
>  the other to the '0' tone), why do you need a miocrocontroller to turn
>  the output into a bitstrea?. A few logic gates is a lot simpler.
>  -tony

Well, microcontrollers are the cool new thing, right? I see in the
robotics club often that the response to just about any problem is,
"Oh, ok, we'll just drop in a microcontroller"

Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn

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