17 Mar
2002
17 Mar
'02
7:53 a.m.
Actually, there is very good documentation on this
keyboard, and I was considering building a tiny PIC
"black box" for this purpose - to convert PC
scancodes to the 4800 baud TTL serial that the VT320
expects. I wasn't going to convert each and every key,
just the ASCII.
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
extent of it.
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LK201:
> I found a few of the keys didn't work right on
> one of them. This is one of those conductive
rubber
> dome keyboards (and cheap and junky ones at
that).
All the LK201s I've worked on have used membrane
switches. But I believe
there are several versions.
> They ask quite a bit for them on the
'net
> ("refurbished", usually meaning they blow the
dirt out
with
compressed air).
With the LK201, blowing out the dirt is about the The keyboard assembly is such that you can not
easily disassemble
it to do a good cleaning.
Taking it apart is easy :-). it's getting it back
together that's the
hard part. It's easy to remove the casing,
electronics, and keycaps. The
rest of it is heat-staked together. You can cut off
the moulded-over
parts, take off the housings, the leafsprings and
then separate the
layers of the membrane sandwich. But it's very hard
to heat-stake
together again (not enough plastic left), and the
housings are too thin
to drill for screws.
> I can find better PC keyboards new for
around
$4.99.
If you mean as in 'Wintel', they are not
compatable.
Since the LK201 protocol is fairly easily available,
I would have thought
it would be possible to use a single-chip
microcontroller to link a PC
keyboard to a LK201 port. I've never tried to write
the code, though.
-tony