Re: A plea: Looking for a working MM5740AAE/N for Apple II Keyboard

["Michael J. Mahon" <mjmahon@aol.com>]

rittwage wrote:
> I have an old Apple II that I've fixed every other odd problem
> (besides a broken Applesoft E0 ROM) except the keyboard!
>
> I found some AAC/N chips, but no luck- the encoding is wrong.  I need
> to see if any kind soul has any AAE/N encoder chips left to spare.
>
> I really hate to convert to PS/2- I like the original keyboard.
> Without that, I might as well use an emulator.  :)

Pete, I'd recommend keeping this thread in csa2 and avoiding
crossposting to marketplace and emulators.

Are you sure that the problem is the encoder chip, and not
one or more shorted keyswitches?  Failed encoders are not
the most common keyboard problems.

If it is the encoder, then you will have a hard time finding
an equivalent replacement.  It would be possible to construct
an equivalent that plugs into the original electrical "footprint",
but it's not a simple project.

Since the encoder presents parallel ASCII to the Apple II, it
should not be too difficult to replace the keyboard with, say,
a later Apple ][+ keyboard.  Those used to be pretty plentiful,
depending on how authentically "Apple" it had to be...

-michael

NadaNet 3.1 for Apple II parallel computing!
Home page:  http://home.comcast.net/~mjmahon/

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