Apple Newton Keyboard Data-sheet
Keyboard data was checked by useing serial data protocol analizer.
So you can use this data own your risk.

When keyboard connected to Newton and power on, Newton Keyboard send the 
following configuration data to Newton twice.

Hex-Dump & ASCII-Code
----------------------------------------------------------------
16  10  02  64  5F  69  64  00  00  00  0C  6B  79  62  64  61
70  70  6C  00  00  00  01  6E  6F  66  6D  00  00  00  00  10
03  DD  E7
----------------------------------------------------------------
SX  DL  SX  d   _   i   d   NU  NU  NU  FF  k   y   b   d   a
p   p   l   NU  NU  NU  SH  n   o   f   m   NU  NU  NU  NU  DL
EX  ]   g
----------------------------------------------------------------

Every key send the following binary data to Newton.
// option & shift+Option is can not Display. 
// Please check "Type! 1.0" document.

char      
code   unshift shfit   option  shift+Option
------ ------- ------- ------- -------
0xB232 `       ~
0x9212 1       !
0x9313 2       @
0x9414 3       #
0x9515 4       $
0x9717 5       %
0x9616 6       ^
0x9A1A 7       & 
0x9C1C 8       *
0x9919 9       (
0x9D1D 0       )
0x9B1B -       _
0x9818 =       +
0xB333 DEL     DEL

0xB030 TAB     TAB
0x8C0C q       Q
0x8D0D w       W
0x8E0E e       E
0x8F0F f       F
0x9111 t       T
0x9010 y       Y
0xA020 u       U
0xA222 i       I
0x9F1F o       O
0xA323 p       P
0xA121 [       {
0x9E1E ]       }
0xAA2A \       |

0xB939 CAPS*  CAPS
0x8000 a      A
0x8101 s      S
0x8202 d      D
0x8303 f      F
0x8505 g      G
0x8404 h      H
0xA626 j      J
0xA828 k      K
0xA525 l      L
0xA929 ;      :
0xA727 '      "
0xA424 RET    RET

0xB838 SHFT*  SHFT 
0x8606 z      Z    
0x8707 x      X    
0x8808 c      C    
0x8909 v      V
0x8B0B b      B
0xAD2D n      N
0xAE2E m      M
0xAB2B ,      <
0xAF2F .      >
0xAC2C /      ?

0xBB3B CTRL*
0xBA3A OPTN*
0xB737 CMND*
0xB131 SPAC 
0xFB7B LEFT 
0xFC7C RGHT 
0xFD7D DOWN 
0xFE7E UP   

(*)
-------------------------------------------
CAPS ON   0xB939
CAPS OFF  0xB939
  (ex.)
        a    a         A    B         a
        8000 8000 B939 8000 8B0B B939 8000
                  ^^^^           ^^^^
                CAPS-ON        CAPS-Off

CAPS mode is controled by your software.
-------------------------------------------
Shift-ON  0xB8 
Shitf-OFF 0x38
  (ex.) 
        a    a       A    B       a
        8000 8000 B8 8000 8B0B 38 8000
                  ^^           ^^
              Shift-Press    Shift-Off
-------------------------------------------
CTRL-ON   0xBB
CTRL-OFF  0x3B

OPTN-ON   0xBA
OPTN-OFF  0x3A

CMND-ON   0xB7
CMND-OFF  0x37

CTRL,OPTN,CMND is similar to Shift-Key Operation.