In message  <199712171728.LAA07430@dfw-ix11.ix.netcom.com>
 PICLIST@MITVMA.MIT.EDU writes:
> Mike Watson <PICLIST@MITVMA.MIT.EDU> wrote:
>
> > In my current project, I have to write to a 16x1 character LCD
> > display (the type based on the Hitachi 44781 (???) chip)
> > ....
> > it seem like the line is split into 2, with the second group of 8
> > characters appearing at some higher address. (ie 0x40).
> >
> > This means that I can't just write chars to the display, I have to
> > know when I go from the 8th to the 9th char and adjust the address
> > accordingly.
> >
> > I have not come across this before. Is this common?
>
>     Yes, it is, Mike... The "16 x 1" displays are actually 8 x 2.
>
>     -Andy
>

I have yet to get this to work, even with the knowledge that they
are configured as 8x2.

I have a program that outputs an address to the display then a
character to all 128 possible display positions, but only the
left hand 8 digits have characters in them.

 o Do the displays need to be initialised as 1 or 2 lines (does it
   make any difference) ?

( Other info:  I have r/w tied low, the display is a known working
display )


Thanks and regards,

Mike Watson