qb45 and SERIAL strange SERIAL port protocol 
Author Message
 qb45 and SERIAL strange SERIAL port protocol

Thanks Tom (Werry) for your posting on this.
In fact QB45 can and does run using the 19200 option for the
BAUD rate - its just not documented (except in my book of course!!)
-- so thats your question answered - so can you now help with
the "8-bit and EVEN parity problem?
I am assuming that one can set these options at a low level by writing
to the actual registers - but I don't know the addresses of the
relevant locations (can anyone help here?)

cheers,
{*filter*}
dept of anaesthetics, City Hospital, Nottingham, UK



Wed, 21 Mar 2001 03:00:00 GMT  
 qb45 and SERIAL strange SERIAL port protocol

Dick:

What do you get from/to the device if you just set the parity at the
PC side to none, which basic says you must use if you have 8 data
bits?  I remembering fooling around with one of these once before
where it didn't matter a heck of a lot what the parity was set to, I
still got my data at the PC end anyway.

I'll go read what a few other routines do in assembler to set the
registers in the 8250 et al.

Do you use a "piggy-in-the-middle" program for sorting out
undocumented I/O to those weirdo devices that come with a PC software
package that doesn't do what you want, and {*filter*}-all dox for you to
do it yourself?

Regards,Tom Werry  gpsnav at pacific dot net dot sg
Programmer's Logic:   Press ENTER to exit.  (laugh now, here)



Wed, 21 Mar 2001 03:00:00 GMT  
 qb45 and SERIAL strange SERIAL port protocol


Quote:

>In fact QB45 can and does run using the 19200 option for the
>BAUD rate - its just not documented (except in my book of course!!)
>-- so thats your question answered - so can you now help with
>the "8-bit and EVEN parity problem?
>I am assuming that one can set these options at a low level by writing
>to the actual registers - but I don't know the addresses of the
>relevant locations (can anyone help here?)

There was a similar thread a couple of weeks ago.  In order to use
a parity bit, you can only specify 7 bit data.  I think a fix was
suggested.  Try deja-news, maybe?

-Mike A.



Thu, 22 Mar 2001 03:00:00 GMT  
 qb45 and SERIAL strange SERIAL port protocol
Use Interrupt 14H service 00. This should allow you to initialize the port
however you want.
HK


Quote:
>Thanks Tom (Werry) for your posting on this.
>In fact QB45 can and does run using the 19200 option for the
>BAUD rate - its just not documented (except in my book of course!!)
>-- so thats your question answered - so can you now help with
>the "8-bit and EVEN parity problem?
>I am assuming that one can set these options at a low level by writing
>to the actual registers - but I don't know the addresses of the
>relevant locations (can anyone help here?)

>cheers,
>Dick
>dept of anaesthetics, City Hospital, Nottingham, UK




Fri, 23 Mar 2001 03:00:00 GMT  
 
 [ 4 post ] 

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