Date   : Fri, 16 Feb 1996 14:51:55 +0000 (GMT)
From   : John Sullivan <js10039@...>
Subject: Re: Tape decoding status

On Thu, 15 Feb 1996, Robert Schmidt wrote:
> >All bytes have one start bit (0) and one stop bit (1) - no parity.
> 
> I nearly forgot that I had big problems figuring out that some recordings
> actually used 2 stop bits, occasionally.  I don't know the reason why,
though.

Is this that big a problem? Is seems easiest to me to do what the UART
does and wait for the zero bit to signal that start of a byte
frame. You might like to make sure you get at least one correct (1)
stop bit, however 2 stop bits shouldn't stop you from decoding
correctly.

(as an afterthought, some sort of PLL arrangement to compensate for
dodgy speed regulation on the tape may be nice also. I'd really like
to do some hacking on this (which needs some tape samples), even if it
is reinventing the wheel by now)


John

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