ncoplin_at_orbeng.com
Date: 2004-05-20 04:55:46
Hi Jim,
The idea I've had is to use an EPROM. 8 address lines in, 8 datalines out.
One CIA drives the addresses (that is the one which outputs the scan value)
the other accepts the output from the EPROM. You might need diodes on the
datalines to create wired-AND with the joystick port. I expect this would be
compatible with most things, except for any software which tries to swap
which of the CIA outputs and which is the input...
-----Original Message-----
From: owner-cbm-hackers@cling.gu.se
[mailto:owner-cbm-hackers@cling.gu.se]On Behalf Of Jim Brain
Sent: Thursday, 20 May 2004 10:28 AM
To: CBM Hackers
Subject: cross point switch
I am trying to build a keyboard eliminator that does not require a cross
point switch to "emulate" the 64/128 keyboard. However, in the event my
idea does not pan out, anyone know a part number for a 8x8 or so switch
that is not as big as the 40 pin monster on 64-KEYB?
I'd like a plan B so my idea doesn't evaporate....
Jim
--
Jim Brain, Brain Innovations
brain@jbrain.com http://www.jbrain.com
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times!
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