Re: [hatari-devel] RS232 sending

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On maanantai 21 toukokuu 2012, Nicolas Pomarède wrote:
> On 20/05/2012 22:48, Eero Tamminen wrote:
> > Btw. While doing this, I discovered that EmuTOS checks RS232
> > sending success differently from how Hatari does it.
> > 
> > It uses MFP TSR register bit 7 (Buffer Empty) instead of
> > IERA/IPRA register bit 2 (Sender buffer empty).
> > 
> > Does anybody know which one is right?
> 
> I never coded for RS232, but I guess both methods could be right.
> 
> Maybe the solution would be to see in Hatari trace what the tos does
> when you try to send data to rs232 (even when nothing is connected to
> the port). It could give a good indication of what the tos expects.

FYI: Roger debugged the issue and fixed a bug in EmuTOS.  It was returning
random values from Bconout() to GEMDOS functions calling it.  Hatari
printing works fine with latest EmuTOS snapshot.


	- Eero