[Coco] Simple, reliable routines for the bitbanger serial port?

[John W. Linville]

On Mon, Mar 16, 2009 at 09:54:12AM -0600, Darren A wrote:
> On 3/15/09, John W. Linville wrote:
> > Anyone have a set of simple (and tested) routines to do
> > one-character-at-a-time transfers through the CoCo's bitbanger port?
> > I don't need high performance, although 9600bps might be nice.
> > I'd prefer routines that only used hard-coded timing loops (i.e. not
> > interrupts) just for simplicity sake, but any working code is welcome.
> >
> > Can anyone help?
> >
> > Thanks!
> >
> > John
> > --
> 
> 
> John,
> The bit banger routines I provided to Boisy for DriveWire 3 can be
> viewed/downloaded from the CVS repository:
> 
> Read code:
> <http://nitros9.cvs.sourceforge.net/viewvc/nitros9/nitros9/level1/modules/dwread.asm?revision=1.2&view=markup>
> 
> Write code:
> <http://nitros9.cvs.sourceforge.net/viewvc/nitros9/nitros9/level1/modules/dwwrite.asm?revision=1.2&view=markup>
> 
> The first routine in each file is for 38400 bps and will work on any
> CoCo.  These may provide more functionality than you need, but they
> are tested and could easily be dumbed down/slowed down for whatever
> purpose you require.

Hey, cool -- thanks!

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville at tuxdriver.com			might be all we have.  Be ready.