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Article #124 (145 is last):
Newsgroups: freenet.sci.comp.atari.library
From: aa700@cleveland.Freenet.Edu (Michael Current)
Subject: CX80 Keypad Hardwiring
Posted-By: xx004 (aa700 - Michael Current)
Reply-To: aa700@cleveland.Freenet.Edu (Michael Current)
Date: Wed Feb 12 00:07:03 1992


Reprinted from the A.C.E.C. BBS (614)-471-8559


CX80 KEYPAD HARDWIRING

     THIS MODIFICATION WORKS WITH ANY
SOFTWARE IN PLACE OF THE SPECIFIC
KEYS.  DO NOT ATTEMPT THIS IF YOU ARE
NOT COMFORTABLE WITH HARDWARE MODS.

TO WIRE THE KEYPAD DIRECT YOU NEED TO
OPEN THE CX85 FIRST AND MAKE SURE
IT HAS SWITCHES.  DE-SOLDER SWITCHES
FROM THE PRINTED WIRE BOARD AND 
TOSS THE N BOARD.  SOME ARE MADE WITH A
MEMBRANE PAD AND THEY WILL NOT
WORK.  TO DO THIS MODIFICATON YOU NEED
TO BUY A 15 PIN MALE AND FEMALE 
"D" JACK AND SOME 13 CONNECTOR WIRE AND
ONE SPST SWITCH.

INSIDE YOUR 800 YOU WILL FIND THAT YOUR
KEYBOARD IS CONNECTED TO THE 
COMPUTER BY A ROW OF 16 PINS.  YOU WILL
NEED TO WIRE FROM 13 OF THESE PINS
TO THE FEMALE 15 PIN D JACK.  WIRE AS
FOLLOWS:

16 PIN KEYBOAD      15 PIN FEMALE D

PIN 1               PIN 1
PIN 2               PIN 2
PIN 3               PIN 3
PIN 5               PIN 4
PIN 7               PIN 5
PIN 9               PIN 6
PIN 10              PIN 7
PIN 12              PIN 8
PIN 13              PIN 9
PIN 14              PIN 10
PIN 15              PIN 11
PIN 16              PIN 12
PIN 17              PIN 13


NOW WITH THAT TAKEN CARE OF, YOU CAN
CLOSE YOUR 800.  NOW YOU CAN START
ON THE KEYPAD.  USE THE 13 CONDUCTOR
CABLE TO WIRE TO THE OTHER D JACK
WIRE ONE WIRE TO EACH OF THE FIRST 13
PINS.  THEN WITH AN OHM METER TO
FIND THE PROPER WIRES, WIRE:

PIN 1 TO ONE SIDE OF THE KEYS 0 7 8 9
PIN 2 TO ONE SIDE OF THE KEYS 1 2 3 4 5
6
PIN 3 TO ONE SIDE OF THE KEYS - =
PIN 4 TO ONE SIDE OF THE KEYS * +
PIN 5 TO ONE SIDE OF THE KEYS / . ,
PIN 6 TO THE OTHER SIDE OF THE KEY
[RETURN]
PIN 7 TO THE OTHER SIDE OF THE KEYS 7
6
PIN 8 TO THE OTHER SIDE OF THE KEYS 8
[RETURN]
PIN 9 TO THE OTHER SIDE OF THE KEYS 9 4
AND ONE TO ONE SIDE OF THE SPST
PIN 10 TO THE OTHER SIDE OF THE KEYS 3
0 AND OTHER SIDE OF SPST
PIN 11 TO THE OTHR SIDE OF THE KEYS / -
+ 2
PIN 12 TO THE OTHER SIDE OF THE KEYS =
* 1 [RETURN]
PIN 13 TO THE OTHER SIDE OF THE
KEYBOARD KEY [BACK]

THIS MAY HELP

KEYPAD KEY     COMPUTER PINS

0              1  14
1              2  16
2              2  15
3              2  14
4              2  13
5              2  12
6              2  10
7              1  10
8              1  12
9              1  13
+              5  15
-              3  15
/              7  15
*              5  16
=              3  16
.              7  14
,              7  13
[RETURN]       12 16

WITH THE . AND , YOU SHOULD WIRE D PIN
5 AND THEN WIRE D PIN 10 TO ONE SIDE OF
THE SPST SWITCH AND D PIN 9 TO THE
OTHER SIDE OF THE . OR , KEY.  THIS
WILL ALLOW YOU TO USE THE KEYBAD FOR
DECIMAL POINTS OR IN DATA STATEMENTS. 
NOW MOUNT THE SWITCH IN THE BACK OF THE
CX85 AND CLOSE IT. 


-- 
 Michael Current, Cleveland Free-Net 8-bit Atari SIGOp   -->>  go atari8  <<--
   The Cleveland Free-Net Atari SIG is the Central Atari Information Network
      Internet: currentm@carleton.edu / UUCP: ...!umn-cs!ccnfld!currentm
     BITNET: currentm%carleton.edu@{interbit} / Cleveland Free-Net: aa700





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