The sole purpose of the reset board is to generate the RESET signal that initializes the Z80 CPU.
Additionally a power-on reset of about 3 ms is triggered when power is applied to the system. This frees us from manually pressing the reset button on start up.
Bill of materials:
- PCB 4x6 cm (at least 5 rows)
- 5-pin right-angled male connector
- DIP-8 socket
- TL7705 supervisor
- tactile push button switch
- resistor 4k7
- capacitor 100 nF
- capacitor 220 nF
The single step circuit on the left side of the board is not part of the reset circuitry. The same applies to the power switch and the red power LED.