[BRLTTY] Reading 132 Column Screens with 80 Column Braille

[Dave Mielke]

[quoted lines by wmichaelb at fuse.net on 2018/11/12 at 16:39 -0500]

It's very common for the length of a braille display to be less than the screen
width. Since longer displays are usually more expensive, it's very common for a
person to opt for spending less money for a shorter display. They come in lots
of sizes. The ones that come to mind at the moment are: 8, 12, 14, 16, 20, 32,
40, 64, 70, 80, 88.

There are two brltty commands - FWINRT for moving one display length to the
right, and FWINLT for moving one display length to the left - that are meant
for this very purpose. They're even designed to wrap - FWINRT wraps to the
start of the next line, and FWINLT wraps to the end of the previous line. A
useful third command - LNBEG - goes to the start of the current line.

Looking at the PB80 bindings, I can see that all these three have been defined,
but they aren't the easiest to use. This is probably because, back in those
days (the PB is a rather old model), it was very common for the text screen
width to be 80 characters so the designer(s) of these bindings probably felt
that moving up/down by lines was more generally useful. The bindings you're
looking for are:

   FWINRT: Button4
   FWINLT: Button3
   LNBEG: LeftRockerUp + Button3

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