Notes
- The 5V Power Supply block contains the voltage stabilizer and filtering capacitors from the power supply on the modem board.
- The Speaker Amplifier block is the LM386-based amplifier circuit that was on the original modem board. The speaker is the internal modem speaker.
- The PICkit 2 Programmer port is intended for reprogramming the microcontroller without disassembling the clock. The DB25 to 6-pin adapter (see the picture) is not shown.
- If your keyboard has different layout than the one shown, refer to Using Different Keyboard in the Code section.
- I used a Techstar 16 characters * 2 lines LCD Module with backlight. These modules are pretty standard, so almost any 16x2 LCD module will work. Backlight is a plus, but it is not mandatory.
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