Apple II Computer Info
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### FILE : shiftkeymod
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### Created : Monday, January 20, 1997 Modified: Monday, January 20, 1997
### File Type: "TEXT" File Creator: "LMAN"
### File Size: 5011 bytes 4 KB
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Path: news1.icaen!news.uiowa.edu!chi-
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Newsgroups: comp.sys.apple2
Subject: Re: Videx U/L-case board
Date: 20 Jan 1997 07:42:36 GMT
Organization: (missing)
Lines: 92
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: : 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.
Apple II Computer Technical Information : Apple II Family Hardware Info
ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 438 of 572
(22 pages)
(16 pages)
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