The new chip is installed on a board of my own design, which has nothing more than the '328 itself, a regulator, some filter caps next to the power pins, and a 16MHz ceramic resonator (with internal caps). ... I have this board hooked up to the Nano in the following configuration:Nano Custom boardpin 10 to Reset (with 10k Ohm pull-up)pin 11 to pin 11pin 12 to pin 12pin 13 to pin 13Ground to Ground+5V to +5V
Programming Nano Target boardD10 (SS) Reset - pin 1D11 (MOSI) Pin 17D12 (MISO) Pin 18 D13 (SCK) Pin 19 Gnd Gnd +5V +5V
On a hunch, I tried doing MOSI to MISO, MISO to MOSI, thinking that they might behave like TX to RX, but to no avail.
I set up the command prompt to loop 10,000 times over trying to program it,
Although, looking at it right now, it seems like the reset pin goes low when the SCK line starts flashing- could it be that the reset needs to be inverted, because it's active low?
I've verified several times, and my board is correct.