TCoCD: IBM C-Q M

top view (click for larger image, 69k)

buttons

mechanism

ball, galvanic sampling

interface

PS/2 (miniDIN 6m)

made by

ALPS

controller

M50740-506FP (ALPS)

65 mm

110 mm

46 mm

180 g

manufacturing date

1987

bottom view (click for larger image, 70k)

inside (click for larger image, 87k)

detail: galvanic sensor (click for larger image, 71k)

detail: open sensor (click for larger image, 60k)

detail: circuitry (click for larger image, 58k)

detail: controller chip (click for larger image, 65k)