3 Apr
2011
3 Apr
'11
2:10 p.m.
On Mon, 4 Apr 2011, terry stewart wrote:
Re: the Keyboard.
All three of my Lisa Keyboards had degraded foam pads so much so that between
the three of them only one key worked! However, the computer still
registered a keyboard as being present.
Alll three keyboards are working now. I got my replacement pads off Erik
Klein, who is a member of this forum. He might have some more left.
TRS-80 Model II, 16 and 6000s all use the same type of foam pads, and
you can make them yourself. I rebuilt a Model II keyboard using the
instructions on this page as a guideline:
http://www.solivant.com/sol20kbd/
Another link on that page claims that Sun Type 4 keyboards can be used
as donors for the pads.
I used a 7/16" hollow punch from Grizzly to cut the pads:
http://www.grizzly.com/products/6-pc-Hollow-Punch-Set/G9845
I've also had success with a punch similar to this:
http://www.semielectronics.com/store/index.php?main_page=product_info&c…
And an emergency mylar blanket from WalMart.
I used 5mm track bed foam from Woodland Scenics, available at your
local hobby shop. The resulting pads are a little stiffer than the
original, but perfectly usable. I used the original plastic discs (after
cleaning them), and glued the mylar, foam and plastic together with
Elmer's Rubber Cement. It's tedious, but it works.
YMMV.
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/