I have been attempting to build a finalgrom99 and am running into an issue. I actually have two boards with all the components installed - the only difference is each has a different sdcard reader.
Programming the atmega328p and setting the fuse bits completes with no errors. (one question about this - I am using the usbtiny on Windows 10 with avrdude. I was using the command line "avrdude -p m328p -c usbtiny -U ..." I didn't specify a port, but it communicated fine with my programmer - is that an issue?) When I turn the console on with no SD card in, the light blinks about once every second. When I start the console with the PLD file, the light stays on for maybe 5 seconds and then goes off, leading me to believe that was successful. With the AVR file, it stays on maybe two seconds and then goes off.
When I turn on the console with a card with images on it, the system does not list the finalgrom as an option after startup - just choice for basic. I have tried with 5 different SD cards of various sizes and qualities, all newly formatted fat or fat32. There are several different results based on the SD card (both cartridges perform exactly the same with the corresponding SD cards).
3 cards - when I power up, the status light stays lit for less than a second and goes off.
1 card - four blinks, a pause and then repeats.
1 card - a blink about once per second.
I don't see the flour blinks pattern on the troubleshooting, but am thinking that the other might indicate bad reader/card/filesystem.
Does anyone have any thoughts on what might be occurring, or what other kinds of tests I can do?
Thanks a lot!