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  1.  
  2.  
  3.  
  4.             4-20pf Var 
  5.     +-----)|---------+
  6.     |                |
  7.    GND      ||       |
  8.        +---||||------+---+----+                        5ea 1N4148
  9.        |    || 32768Hz   |    |
  10.        |                 /20M |                    5V---|<|-----|<|---+
  11.        +---)|---GND      \    | 2 +---------+ 24                      |
  12.        |   10pf          /    +---+         +----+--|<|----+----|<|---+
  13.        |                 |      3 |         |  V |       G |          |
  14.        +-------/\/\/-----+--------+ MC14    |  B +---)|--N |          /
  15.                390k            17 | 6818    |  B |  1uf  D |          \ 560
  16.                        DS---------+         |    |         +--+       /
  17.                                14 | [C8]    |    +--|<|--+    |       |
  18.                        AS---------+         |    |       |    |      [10]
  19.          18 +-----+ 2          11 |         |    +-/\/\/-+    |      12v
  20.  D7---------+     +---------------+         |      100k  |    |
  21.          17 |74LS | 3          10 |         | 18         |    |
  22.  D6---------+ 245 +---------------+         +------+-----+    |
  23.          16 |     | 4           9 |         | 22   |       G  |
  24.  D5---------+     +---------------+         +------+--)|---N  |
  25.          15 |[B8] | 5           8 |         |        1uf   D  |
  26.  D4---------+     +---------------+         |                 |
  27.          14 |     | 6           7 |         | 20              |
  28.  D3---------+     +---------------+         +----- GND        | +
  29.          13 |     | 7           6 |         |             ---------
  30.  D2---------+     +---------------+         |              -------   4 CELL
  31.          12 |     | 8           5 |         |             ---------  NICAD
  32.  D1---------+     +---------------+         |              -------
  33.          11 |     | 9           4 |         |             ---------  5 VOLTS
  34.  D0---------+     +---------------+         |              -------
  35.             |     |               |         |                 |
  36.         19  |     | 1          15 |         | 13              |
  37.  SEL*------O|     +-------+-------+         |O-----------+   GND
  38.             +-----+       |       +---------+            |
  39.  BRW ---------------------+                              |
  40.                                                  +-------)-------+
  41.         74LS04 [A6]                              O       |       |
  42.        3 |\  4 SEL 1                       12 +-----+ 9  |       |
  43.  SEL*----| >O-------+                 GND-----+     +----+       |
  44.          |/       2 +---                      |     |            |
  45.  LDS----------------+    \  6  11 |\  10 AS 11|     | 8          |
  46.                   4 |     |O------| >O--------|>    |O---+       |
  47.  A1-----------------+    /        |/          +-----+    |       |
  48.        1 |\  2    5 +---                         O       |       |
  49.  BRW-----| >O-------+                            |       |       |
  50.          |/                                     VBB      |       |
  51.                    74LS20 [A7]                           |       |
  52.                                                2/2 74HC  | [A8]  |
  53.                  13                                 74   |       |
  54.          5V---------+                                    O 4     |
  55.                  12 +---                            2 +-----+ 5  |
  56.  SEL----------------+    \  8   9 |\  8       GND-----+     +----+
  57.                  10 |     |O--+---| >O----DS          |     |       NOTE:
  58.  LDS----------------+    /    |   |/                3 |     | 6      chips at
  59.        5 |\  6    9 +---      +-----------------------|>    |O-     A8 and C8
  60.  A1------| >O-------+                                 +-----+       powered
  61.          |/                                              O 1        from VBB
  62.                                                          |          not from
  63.                                                          +---[53]   5v sup
  64.                                                              RES*
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