Last Updated or created 2022-10-21
I started to get some composite video generated with a arduino for my 6502 project.
It is based on Grant Searle’s design, and yesterday I had some signals on my scope which looked like a screen with a character. But my monitor would not recognize a usable signal.
Today I tried a second version and another set of chips and crystals.
It looks like a signal, but I can’t see a clock pulse from the crystal?! So .. how?
Maybe I used a bad power supply. And killed something?
After switching to another power supply, and checking the atmega328p fuses again (also wrong) .. at least SOME success!
Some minipro info #Erase minipro -p ATMEGA328P@DIP28 -E #Flash hex code minipro -p ATMEGA328P@DIP28 -w SBCVideo.hex #Flash fuses minipro -p ATMEGA328P@DIP28 -e -c config -w fuses #Used fuses file fuses_lo = 0xf7 fuses_hi = 0xd9 fuses_ext = 0xff lock_byte = 0xff #Dump all from atmega328p minipro -p ATMEGA328P@DIP28 -r dump -f ihex
Some info about the fuses: