Hi, I'm learning to use the Interrupts, but most info is about the UNO (ATmega328) and not the MEGA (ATmega2560) which I'm using for my current project.
I wonder if there's a complete list of all the interrupts (and vector names) somewhere that I can write down in my notes. Interrupt-priority order would also be very nice.
Thanks in advance!
Okay I looked at the datasheet and there was a complete list ofc. 
Datasheet under "Interrupts - Page 101-102
1 RESET
2 External Interrupt Request 0 (INT0_vect)
3 External Interrupt Request 1 (INT1_vect)
4 External Interrupt Request 2 (INT2_vect)
5 External Interrupt Request 3 (INT3_vect)
6 External Interrupt Request 4 (INT4_vect)
7 External Interrupt Request 5 (INT5_vect)
8 External Interrupt Request 6 (INT6_vect)
9 External Interrupt Request 7 (INT7_vect)
10 Pin Change Interrupt Request 0 (PCINT0_vect)
11 Pin Change Interrupt Request 1 (PCINT1_vect)
12 Pin Change Interrupt Request 2 (PCINT2_vect)
13 Watchdog Time-out Interrupt (WDT_vect)
14 Timer/Counter2 Compare Match A (TIMER2_COMPA_vect)
15 Timer/Counter2 Compare Match B (TIMER2_COMPB_vect)
16 Timer/Counter2 Overflow (TIMER2_OVF_vect)
17 Timer/Counter1 Capture Event (TIMER1_CAPT_vect)
18 Timer/Counter1 Compare Match A (TIMER1_COMPA_vect)
19 Timer/Counter1 Compare Match B (TIMER1_COMPB_vect)
20 Timer/Counter1 Compare Match C (TIMER1_COMPC_vect)
21 Timer/Counter1 Overflow (TIMER1_OVF_vect)
22 Timer/Counter0 Compare Match A (TIMER0_COMPA_vect)
23 Timer/Counter0 Compare match B (TIMER0_COMPB_vect)
24 Timer/Counter0 Overflow (TIMER0_OVF_vect)
25 SPI Serial Transfer Complete (SPI_STC_vect)
26 USART0 Rx Complete (USART0_RX_vect)
27 USART0 Data Register Empty (USART0_UDRE_vect)
28 USART0 Tx Complete (USART0_TX_vect)
29 Analog Comparator (ANALOG_COMP_vect)
30 ADC Conversion Complete (ADC_vect)
31 EEPROM Ready (EE_READY_vect)
32 Timer/Counter3 Capture Event (TIMER3_CAPT_vect)
33 Timer/Counter3 Compare Match A (TIMER3_COMPA_vect)
34 Timer/Counter3 Compare Match B (TIMER3_COMPB_vect)
35 Timer/Counter3 Compare Match C (TIMER3_COMPC_vect)
36 Timer/Counter3 Overflow (TIMER3_OVF_vect)
37 USART1 Rx Complete (USART1_RX_vect)
38 USART1 Data Register Empty (USART1_UDRE_vect)
39 USART1 Tx Complete (USART1_TX_vect)
40 2-wire Serial Interface (TWI_vect)
41 Store Program Memory Ready SPM READY (SPM_READY_vect)
42 Timer/Counter4 Capture Event (TIMER4_CAPT_vect)
43 Timer/Counter4 Compare Match A (TIMER4_COMPA_vect)
44 Timer/Counter4 Compare Match B (TIMER4_COMPB_vect)
45 Timer/Counter4 Compare Match C (TIMER4_COMPC_vect)
46 Timer/Counter4 Overflow (TIMER4_OVF_vect)
47 Timer/Counter5 Capture Event (TIMER5_CAPT_vect)
48 Timer/Counter5 Compare Match A (TIMER5_COMPA_vect)
49 Timer/Counter5 Compare Match B (TIMER5_COMPB_vect)
50 Timer/Counter5 Compare Match C (TIMER5_COMPC_vect)
51 Timer/Counter5 Overflow (TIMER5_OVF_vect)
52 USART2 Rx Complete (USART2_RX_vect)
53 USART2 Data Register Empty (USART2_UDRE_vect)
54 USART2 Tx Complete (USART2_TX_vect)
55 USART3 Rx Complete (USART3_RX_vect)
56 USART3 Data Register Empty (USART3_UDRE_vect)
57 USART3 Tx Complete (USART3_TX_vect)