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Text File  |  1988-08-17  |  3.4 KB  |  59 lines
  1.  
  2.                               Figure 1
  3.  
  4.             ASCII Representation of DCD Circuit Schematic
  5.  
  6.  
  7.        //=================7 wire BUS * ================\\
  8.       ||                                                ||
  9. +5 V>-----------+--+---------------+--+--+--+--+----------------+-----+
  10. supply||        |  +---|(---G      |  |  |  |  |        ||    __|___  |
  11.       ||        |     10uF         |  |  |  |  |        ||   | 14   | |
  12.       || +------+------+      +----+--+--+--+--+------+ ||   |      | |
  13.       |\-| 3   20     2|------|10  28 27 26 23 1    11|-/|   | U3   | |
  14.       |\-| 4          5|------| 9                   12|-/|   |74HC14| |
  15.       |\-| 7   U1     6|------| 8         U2        13|-/|   |      | |
  16.       |\-| 8          9|------| 7                   15|-/|   |__7___| |
  17.       |\-|13 74HC374 12|------| 6       27C64       16|-/|      |     |
  18.       |\-|14         15|------| 5                   17|-/|      G     |
  19.        \-|17         16|------| 4                   18|-/             |
  20. DATA>----|18 11 10 1 19|------| 3 25 24 22 21 20  2 19|--/\/\/\/---+  |
  21. from     +---+--+--+---+      +----+--+--+--+--+--+---+    4.7K    |  |
  22. modem chip   |  |  |               |  |  |  |  |  |                |  |
  23.              |  |  |               |  |  |  |  |  |           +----+  |
  24. CLK >--------+  +--+               +--+--+--+--+--+           |       |
  25. input from         |               |                          |  Q1   |   Q2
  26. X16 or X32 baud    G               G                          |     E-+-E
  27. clock source                                                  |   |/ 2N  \|
  28.                                                               +-B-| 3906  |-B-+
  29. GND >---G                                                         |\ (2) /|   |
  30.                                                                     C-+-C     |
  31.                                  1N4148                               |       |
  32. DCD <--------+                +----|<|----+        +------------------+       |
  33. out     U3D  |   U3C     U3B  |           |   U3A  |                          |
  34. ___    8 /|9 |  6 /|5   4 /|3 |   220K    |  2 /|1 |   470K                   |
  35. LED <--o< |--+--o< |--+-o< |--+--/\/\/\/--+--o< |--+--/\/\/\/--G              |
  36. out      \|       \|  |   \|  |                \|  |                          |
  37. ___                   |       |   0.47uF           |   0.1uF                  |
  38. DCD <-----------------+       +----|(-----G        +----|(-----G              |
  39. out         100K                                                              |
  40.        +--/\/\/\/--G                                                          |
  41.        |  U3F                                                                 |
  42.        |13|\12                           __                    10K            |
  43.  CD >--+--| >o------+------------------< CD  <---------+-----/\/\/\/----------+
  44. from      |/        |                   JMP1           |
  45. modem               |                 (AMD7910)        |
  46. chip                |  11|\10                          |
  47.                     +----| >o----------< CD  <---------+
  48.                          |/             JMP2
  49.                         U3E           (TCM3105)
  50.  
  51.                 NOTE:  Only JMP1 OR JMP2 installed NOT both!
  52.  
  53.                     *  BUS wire connections are in order
  54.                        vertically.  Top pin goes to top
  55.                        pin bottom pin goes to bottom pin
  56.                        etc.
  57.  
  58. EOF
  59.