XO      X1      X2      X3  |   X4      X5      X6      X7
------------------------------------+--------------------------------
YO      ESC     TAB     A       Z   |   /       )       *       ESC
                                    |
Y1      1!      Q       D       X   |   DOWN    UP      LEFT    RIGHT
                                    |
Y2      20      W       S       C   |   0       4       8       (
                                    |
Y3      34      E       H       V   |   1       5       9       -
                                    |
Y4      4$      R       F       S   |   2       6       .       RETURN
                                    |
Y5      6"      Y       G       N   |   3       7       +       ,
                                    +----------------------------------
Y6      5%      T       J       M       \|      `~      RETURN  DELETE

Y7      7&      U       K       ,<      +=       P      UP       DOWN

Y8      8*      I       ;:      .>      0)       [{     SPACE   LEFT

Y9      9(      O       L       /?      -_       ]}      '"      RIGHT


The RetroConnector IIe maps the 26 Apple IIe pins to Teensy++ pins

IIe  Col/Row  Teensy
1     Y0        10
2     Y1	45
3     +5V       +5v
4     Y2	44
5     SW1/CAPL  9
6     Y3	43
7     SW0/OAPL  8
8     Y4	42
9     CAPLOCK*  7
10     Y5	41
11     CNTL*    5
12     Y8	40
13     GND      GND
14     X0	39
15     RESET*  4
16     X2      38
17     X7      3
18     X1	18
19     X5       2
20     X3	19
21     X4       1
22     Y9	20
23     Y6      0
24     SHFT*	21
25     Y7      27
26     X6	22