On Sat, 2014-04-26 at 09:55 -0300, Isaac Marino Bavaresco wrote:

> As a side note, the DDRAM mapping is weird. Addresses from 0x00 to n-1
> (n=3D number of columns) are shown in the first line and addresses from
> 0x40 to 0x40 + n-1 are shown on the second line.
> For modules with 4 lines, addresses n to 2*n-1 are shown on the third
> line and 0x40+n to 0x40+2*n-1 on the fourth line.

And that is not universally true, unfortunately.  These days few LCDs
have actual Hitachi controllers - usually they are clones, and sometimes
the clones implement special features.

On my Explorer 16, address 0x10 is displayed on the first character of
the second line, as well as 0x40.  I haven't dinked around to see what
happens if both locations contain something other than a blank; I kind
of view that "feature" as a bug.  But I'm sure some genius figured it
made life easier for someone.

It looks as if Microchip uses 3 or 4 different LCDs on the Explorer 16
so I would be surprised if they all did this.

I've seen other strangeness in some LCDs, but the Explorer 16 was the
only one that I could see the point, even if I disagreed.

--McD


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