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From: Steve Jensen <sjensen@ns.qnis.net>
Newsgroups: comp.sys.apple2
Subject: Re: Videx U/L-case board
Date: 20 Jan 1997 07:42:36 GMT
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Paul Creager <wily@svpal.svpal.org> wrote:
: Ward C. Travis (travis@cluracan.org) wrote:
: : I opened an Apple II+ the other day and two things surprised me...
: : First, there was a board labeled "VIDEX" tacked under the keyboard;
: The official name is the Videx Keyboard Enhancer. It replaces Apple's
: keyboard encoder board underneath the keyboard. Besides providing true
: U/L capability (with the Shift Key), it had a small (10-20 character)
: buffer and supported programmable macro keys.
: I had one on my ][+, until it went south. I can't remember all that much
: about installation, dip switches, etc. I do remember a couple of wires
: had to be run to the motherboard. One enabled true Shift key usage. The
: other I can't remember. If you don't have a wire running to an IC on the
: motherboard, that explains why your Shift key isn't working. It could
: very well be the same spot where the "traditional" Shift key mod is made,
: if that's any help.
Here's 3 files I have on the 'shift key mod':
II+ SHIFT KEY MOD
=================
Here is the "shift key mod" for a II+. A wire should run from
the second pin from the edge opposite the power supply on the connector
between the keyboard and its piggy-back board (pin 24 if counting from
the other end). It should go to one of the game port pins (pin 4) or
to pin 1 of a nearby 74LS251 (at board location "H14").
This wire connects the SHIFT keys to the "Switch 2" input on the game
port (which is infrequently used). It allows programs to sense the
state of the shift key by watching the SW2 I/O location ($C062). If
bit 7 is set, then the shift key is up. If bit 7 is clear, then the
shift key is down.
HOW TO DO A "SHIFT KEY MOD"
To install the "shift key mod" on a II+ what you need to do is connect
a wire from the shift key pin on the keyboard aux. circuit board (this
hangs below the keyboard) to annunciator 3 on the joystick port. The shift
key pin is the second pin from the right on the "piggy-back" circuit
board under the keyboard. You will probably need to solder it on. Pin 4 on
the joystick connector is where you stick the other end. You can just push
the wire in and then probably replace the joystick (if there is one) right
on top of it.
In case that was unclear, 2nd from the right means as you look under
the keyboard from the front, and pin 4 is the fourth pin down on the left
with
the notch at the top (on the joystick connector). Now, when the shift key
is pressed, it sets (or clears?) AN3. Some programs look for this. However,
DOS and Applesoft don't, as far as I know.
APPLE II SHIFTKEY MODIFICATION
------------------------------
The one wire shiftkey mod is the oldest and simplest fix that
can be made to the Apple II to get true upper and lower case
operations with the shift key. Most good word processors have
input routines that check the PB2 input on the game I/O port to
determine if the shift key is being pressed. Some programs that
have these routines are Wordstar, Write-on, Apple Pascal 1.1 and
many others. Follow the steps below to install the shift key mod.
parts:
1 mini-grabbette clip (Radio Shack PN 270-370)
1 15 in. piece of small guage wire
1 16 pin socket
1) Solder one end of the wire to the mini-grabbette clip.
2) Solder the other end of the wire to pin 4 of the 16 pin socket
as close to the body of the socket as possible.
3) Turn the Apple II off and remove the cover.
4) Remove anything plugged into the game I/O socket.
5) Attach the mini-grabbette clip to pin 24 of the keyboard encoder
connector. This connector is located inside the Apple II directly
beneath the RESET key. Pin 1 is nearest the power supply and pin
25 is nearest the right edge of the Apple II. Use the grabbette
clip to attach to the standoff _pin 24_ (second from the end).
6) Lead the other end of the wire with socket attached along the
right edge of the motherboard and plug it into the game I/O port.
Be careful to plug pin 1 to pin 1 when putting this socket in.
Pin 1 of the game I/O port is towards the front of the computer.
7) Replace the cover and start using lower case characters.
eof
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