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From: darrelj@sdcrdcf.UUCP (Darrel VanBuer)
Newsgroups: net.micro
Subject: Re: Smart keyboard for apple IIe
Message-ID: <931@sdcrdcf.UUCP>
Date: Wed, 21-Mar-84 13:00:08 EST
Article-I.D.: sdcrdcf.931
Posted: Wed Mar 21 13:00:08 1984
Date-Received: Fri, 23-Mar-84 21:01:31 EST
References:  <223@mi-cec.UUCP>
Reply-To: darrelj@sdcrdcf.UUCP (Darrel VanBuer)
Organization: System Development Corporation, Santa Monica
Lines: 16

Assuming the IIe keyboard is similar to the II/II+ keyboard, the interface
between the keyboard and processor board is pretty simple (and documented in
the Apple II Reference Manual): seven parallel data lines carrying the
ASCII character, an edge-triggered strobe line (a short pulse sets the
character available latch), and a few lines for power to the keyboard.
I.e. all you need is an 8 bit output port on your substitute keyboard
(and an 8-bit input port if you want to read the "real" keyboard yourself).

-- 
Darrel J. Van Buer, PhD
System Development Corp.
2500 Colorado Ave
Santa Monica, CA 90406
(213)820-4111 x5449
...{allegra,burdvax,cbosgd,hplabs,ihnp4,sdccsu3,trw-unix}!sdcrdcf!darrelj
VANBUER@USC-ECL.ARPA