Caple C871i Manual do Utilizador descarregar pdf (Página 199)

100

101

Apple II Computer Info

If U1 pin 11 is near 0V and pin 19 of the KB Controller IC is not, then,

there is either a break in the line connecting the pins or one or both IC's are

making poor socket contact.

If pin 19 of the KB Controller IC is near 0V when the CTRL key is not

pressed and near 4-5V when the CTRL key is pressed, then, if you still have

'stuck CTRL key' symptoms, there is a good chance that the KB Controller IC is

messed up.

Note: all of this assumes that your KB is like the one diagrammed in the Apple

][ Reference Manual on page 101.

The keyboard is known to be a weak point in ][+ design. Probably, Apple

did not expect the machines to be in service at the turn of the century!

After a plague of KB problems, we ended up yanking the entire thing,

enlarging the KB opening, and installing a home-brew KB. It uses the key matrix

from a surplus reed-switch KB and a decoder circuit designed around the SMC

KR2376-ST KB Controller IC.

Rubywand

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### ii+keyboards

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 199 of 572

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Caple C871i Manual do Utilizador Página 199

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