[Coco] CoCo bitbanger does 115200 bps !

[Roger Taylor]

At 06:43 PM 4/4/2006, you wrote:
>Does this, by any chance, open a possibility to use a 56 Kbps external 
>modem????
>
>Diego


Diego,

We've always been able to use those modems.  I used a 33.6 for years with 
my CoCo.  You can set Ultimaterm 4.0 to the 450 bps setting which is a bug 
that really means 115200 bps or the 16x External Clk setting of the 
6551.  My own unreleased NetMate terminal program had this mode built in 
called 115.2k.

Anyway, this is the bottleneck speed between the CoCo and the modem but you 
can connect to another modem/computer at 56k no matter what the CoCo is 
doing.  The two concepts are different.  Ofcourse, you do want to be able 
to receive the modem data as fast as it is sending it and this is why the 
115200 bps mode of the 6551 worked great.

As for my 115200 bps bitbanger protocol.  The answer to your question is No 
because normal communications rules do not really apply.  The code is very 
tricky and special handshaking has to be used which normal telecomm 
programs don't support.





-- 
Roger Taylor