Microcontroller PIC16f628a has 128 bytes of EEPROM memory on board, not too much but we have what we have. Hi-tech PICC compiler has internal functions for work with EEPROM, but here I’m going to make some my personal functions.
At that point of time, I did not have a lot of possibilities to buy any commercial development board, so I had to make my own
I wanted to make a small board, not those huge with everything you can imagine, and, perhaps, never going to use. A 3d model shows what I wanted and what I made: 4 buttons + 4 LED hanging on the PORTB. There is also one button and one LED for PORTA. Everything can be disconnected from the microcontroller using the dip switch.