>C=N RM=80 LM=3 TM=1 BM=66 J=N                               Reset Circuit                       Fig. 4    |--\/\/\/---> 5 Volts                                                       |  1Kohm                                       +                            |            |----------|Diode>|----|------------|(-------------|           |            |           1N4001     |         35mfd Cap         |       |---|            |                      |---------\/\/\/\--->Gnd    |       |   O            |-> DPU1- 1 Tri-State Enable      12Kohm           |       |  -------0------|-> HD64180 - 6   Buss Request                     |       |   O                                                               |       |   |-----|                                        +                |       |   |     |      |----------|Diode>|----|------------|(-------------|       |   |    \ /     |           1N4001     |         35mfd Cap         |       |   |    GND     |                      |---------\/\/\/\--->Gnd    |       |   O            |-> DPU3-19  Tri-State Enable                      |       |  -------0------|-> Z80 Cpu - 25  Buss Request                     |       |---O                                                               |          DPDT Switch                                                      |            |--------------------------------------------------------------|            |       1  |----\                                                           |----------| DPU4 \    3         4  |----\                                  |       2  | 74LS00 O---------------| DPU4 \   6   10 |----\                |----------| NAND /              5  | 74LS00 O--|-----| DPU4 \    8         |          |----/             |-----| NAND /    |  9  | 74LS00 O---|        |                             |     |----/      |-----| NAND /     |        |-----\/\/\/\--->Gnd          |                       |----/       |               1Kohm                  |--> C136 Main Board                 |          Note Remember to Cut Trace (or Lift pin  |-----------------------|               of U32) Between U32-7 & U29-1       |                                                                           |--> Z80-26 Reset                                                           |--> HD64180-7 Reset                                                        |--> Z80Soc-26 Reset                   HD64180 Crystal                                                                              7 pf Cap                                                                |-----|(-----> Gnd                                          |-------|       |                                                           | Xtal  |-------|-> HD64180 - 2                                             |       |-------|-> HD64180 - 3                                             |-------|       |                                                       12.288 Mhz          |-----|(-----> Gnd                                       Crystal                7 pf Cap                                                                                                                      