Re: [stella] compact send-only serial subroutine

Subject: Re: [stella] compact send-only serial subroutine
From: "Fred Quimby" <c9r@xxxxxxxxxxx>
Date: Sat, 13 Aug 2005 21:17:10 -0400
I'll try it later... The terminal program looks interesting.

The hardware stuff is fun - gives me a brief distraction from working on bB. 
  I hacked out something else based on the serial driver - I'll start a new 
topic for it.

>I'll stick to send-only for now.  The receive really
>happens on the Supercharger so there isn't a need for
>it outside of handshaking signals.
>
>John K. Harvey's Teleterm sounds like he didn't
>introduce any extra parts in his cable.
>
>http://tinyurl.com/7ozbm
>
>In the meantime, do you want to finish wiring up a
>cable for send and receive and try out his binary?
>
>I don't think he's using CTS/RTS but there would be
>definite advantages there if you are talking about a
>real terminal program.
>
>
>
>--- Fred Quimby <c9r@xxxxxxxxxxx> wrote:
>
> > I forgot that you should have a diode too so that
> > the -12v doesn't make it
> > through.  This circuit should output about +3v for
> > +12v and 0v for -12v.
> > Should produce valid TTL levels for serial ports
> > that output +9v and up.  If
> > your serial port outputs less than 9v, reduce the
> > size of the 3k resistor
> > accordingly.
> >
> >                    3k
> > 2600 Pin 2 ----/\/\/\/\------|<---- TxD (pin 3 on
> > PC)
> >               |
> >               \
> >               /
> >               \ 1k
> >               /
> >               |
> >              GND
> >
> >
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>
>
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