Understanding the alert error numbers

Format of the alert error number

The 32 bit long error number consists of 4 segments. Amiga displays the number in hexadecimal and in a general format it looks like this:

0xDIGGSSSS

The letters have the following meaning:

Letters in Code	Description	Bits	Length (bits)
D	Alert type: DeadEnd (bit 31 is set) or RecoveryAlert (bit 31 is not set)	31	1
I	ROM subsystem number	30...24	7
GG	General error: roughly indicates what the error was	23...16	8
SSSS	Specific error: indicates more detail	15...0	16

Hardware and CPU specific alerts

Alert	Type	Description
0x00000002	Recoverable	Hardware bus fault or access error
0x00000003	Recoverable	Illegal address access i.e. odd address
0x00000004	Recoverable	Illegal instruction
0x00000005	Recoverable	Divide by zero
0x00000006	Recoverable	Check instruction error
0x00000007	Recoverable	TrapV instruction error
0x00000008	Recoverable	Privilege violation error
0x00000009	Recoverable	Trace error
0x0000000A	Recoverable	Line 1010 Emulator error
0x0000000B	Recoverable	Line 1111 Emulator error
0x0000000E	Recoverable	Stack frame format error
0x00000018	Recoverable	Spurious interrupt error
0x00000019	Recoverable	AutoVector Level 1 interrupt error
0x0000001A	Recoverable	AutoVector Level 2 interrupt error
0x0000001B	Recoverable	AutoVector Level 3 interrupt error
0x0000001C	Recoverable	AutoVector Level 4 interrupt error
0x0000001D	Recoverable	AutoVector Level 5 interrupt error
0x0000001E	Recoverable	AutoVector Level 6 interrupt error
0x0000001F	Recoverable	AutoVector Level 7 interrupt error
0x80000002	Dead end	Hardware bus fault or access error
0x80000003	Dead end	Illegal address access i.e. odd address
0x80000004	Dead end	Illegal instruction
0x80000005	Dead end	Divide by zero
0x80000006	Dead end	Check instruction error
0x80000007	Dead end	TrapV instruction error
0x80000008	Dead end	Privilege violation error
0x80000009	Dead end	Trace error
0x8000000A	Dead end	Line 1010 Emulator error
0x8000000B	Dead end	Line 1111 Emulator error
0x8000000E	Dead end	Stack frame format error
0x80000018	Dead end	Spurious interrupt error
0x80000019	Dead end	AutoVector Level 1 interrupt error
0x8000001A	Dead end	AutoVector Level 2 interrupt error
0x8000001B	Dead end	AutoVector Level 3 interrupt error
0x8000001C	Dead end	AutoVector Level 4 interrupt error
0x8000001D	Dead end	AutoVector Level 5 interrupt error
0x8000001E	Dead end	AutoVector Level 6 interrupt error
0x8000001F	Dead end	AutoVector Level 7 interrupt error