I’ve been playing around with TinyBASIC Arduino Nano tonight and hooked up a blue LED and had it flash.
10 FOR A=0 TO 10
20 DWRITE 13, HIGH
30 DELAY 250
40 DWRITE 13, LOW
50 DELAY 250
60 NEXT A
Parts:
1 x 330 resistor
1 x LED
2 x connecting wires
D13 is connected to 330 resistor to positive LED and negative to GND.Also saved it to EEProm on chip using ESAVE command so that it stored when I turn off and on again.