Re: [stella] compact send-only serial subroutine

Subject: Re: [stella] compact send-only serial subroutine
From: Glenn Saunders <mos6507@xxxxxxxxx>
Date: Sat, 13 Aug 2005 14:30:12 -0400
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.

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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