Date   : Wed, 27 Jul 1994 09:47:12 +0100
From   : jfid@... (James Fidell)
Subject: Re: BBC -> PC.

Stephen Quan wrote:

> Stephen Quan writes (that's me!) :
> 
> > How did you transfer your BBC ROMs to your emulators???
> > Did you construct a serial cable from the RS423 to the RS232 and use
> > some kind of terminal transfer program?
> 
> James Fidell writes :
> 
> > I made up a serial cable.  I've had problems in the past, because the
> > signal level ranges are different between RS423 and RS232 and even
> > though theoretically there shouldn't be any problems, some hardware won't
> > talk.  My PC seems to talk to the beeb fine, though.
> 
> My hardware skill is not very good, having only soldered only a handful
> of things.  Am I correct in assuming that you only need to connect pins
> 2,3,7 from the RS232 to the appropriate pins RS423?  I think I have the
> pin assignments for the RS423 cable in one of the beeb user's guides,
> so, I'll check there.  Do I have to construct a NULL modem cable and
> have a cross over somewhere?

As a minimum, you need TX, RX and GND.  It is possible to do software flow
control over such a cable, but I'm not a big fan of such an approach --
I prefer to use the RTS and CTS lines as well.

> 
> I am not running UNIX, but I think I can use Windows "Terminal", to do
> the file transfer [ghastly!].
>

Didn't someone say that there was a kermit implementation available for
the Beeb somewhere ?  This might be the easiest approach.

James.

-- 
 "Yield to temptation --             |
  it may not pass your way again"    |     jfid@...        
                                     |
        - Lazarus Long               |              James Fidell