Coil spring should be set inside key
stem assy. I don't want to disassemble this key stem assy. .If
I go further, I may break it.
Closing/Opening contacts is made by round actuation spring witch
sits between the copper sheet and the key stem assy. At the
same time actuation spring generates tactility and tiny clicking
This unit was made in 23NOV
1992 according to a stamp on the bottom shell.
in the center of pic without cap is for space bar.
Stabilizing rod is ready ( not seen in the pic )
is seen at the bottom center in the picutre.
Not sure but Nan Tan might be the supplier.
Keyboard unit itself is really
small. A mouse
on the board is for comparison.
I can't figure out its pin-out yet.
; In ALPS catalog '94 edition, ALPS switches used for
Northgate Omnikey 101, Apple
Extended Keyboard ( including II ), DELL AT-101, Zenith Data
System ZKB-2 and
many of PC/AT keyboards are coded as SKCM and SKCL (
CM for tactile feel while
CL for linear feel ) . SK is a given code which
indicates keyboard switch products.
In Japan and other Eastern countries, either "Bigffoot"
or "Bigfoot class switch" or just
simply "ALPS switch" is usually used to call these
switches among keyboard enthusiasts.
Bigfoot itself is a nickname indicating DELL AT-101 and it's