1st stage loader for IMSAI - need ascii to binary conversion
mcguire at neurotica.com
Tue Feb 26 16:53:38 CST 2008
On Feb 26, 2008, at 2:57 PM, Tony Duell 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.
There's still quite a bit of design involved. Microcontrollers
aren't "automatic", as I'm sure you're well aware. A microcontroller-
based design is every bit as valid and honest as an all-discrete design.
> For the standard 1200/2400Hz cassette tones, there's a very simple
> circuit using a pair of monostables (one-shots) -- IIRC a single
> 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'
> 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.
Well, Chuck said it best, but I'll add this: You get fewer
components, lower cost, easier maintainability and tweakability,
increased flexibility, the possibility for a reusable design...how is
this a bad thing?
Port Charlotte, FL
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