Date   : Wed, 27 Jul 1994 12:27:50 EST
From   : Stephen Quan <quan@...>
Subject: Re: BBC -> PC.

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?

> I've been transferring files by running this program at the Beeb end :
> 
>   10 *FX 3,3
>   20 *DUMP <filename>
>   30 *FX 3,0
> 
> and just doing :
> 
>   cat < /dev/ttyS1 > <filename>
> 
> on the PC (hey, it's easy when you're running UNIX :-)  I then wrote a
> short C program to convert the *DUMP format to a binary.
> 
> James.

I am not running UNIX, but I think I can use Windows "Terminal", to do
the file transfer [ghastly!].
-- 
Stephen Quan (quan@...                 ), SysAdmin, Analyst/Programmer.
Centre for Spatial Information Studies, University of Tasmania, Hobart.
GPO BOX 252C, Australia, 7001.  Local Tel: (002) 202898 Fax: (002) 240282
International Callers use +6102 instead of (002).