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

General alerts

Alert	Type	Description
0x00010000	Recoverable	No memory
0x00020000	Recoverable	Make library error
0x00030000	Recoverable	Open library error
0x00040000	Recoverable	Open device error
0x00050000	Recoverable	Open resource error
0x00060000	Recoverable	IO error
0x00070000	Recoverable	No signal
0x00080000	Recoverable	Bad parameter
0x00090000	Recoverable	Too many library closes
0x000A0000	Recoverable	Too many device closes
0x000B0000	Recoverable	Process creation failed
0x000C0000	Recoverable	Obsolete feature used
0x00008001	Recoverable	Exec library error
0x00008002	Recoverable	Graphics library error
0x00008003	Recoverable	Layers library error
0x00008004	Recoverable	Intuition library error
0x00008005	Recoverable	Math library error
0x00008007	Recoverable	DOS library error
0x00008008	Recoverable	RAM library error
0x00008009	Recoverable	Icon library error
0x0000800A	Recoverable	Expansion library error
0x0000800B	Recoverable	Diskfont library error
0x0000800C	Recoverable	Utility library error
0x0000800D	Recoverable	KeyMap library error
0x0000800E	Recoverable	Newlib library error
0x00008010	Recoverable	Audio device error
0x00008011	Recoverable	Console device error
0x00008012	Recoverable	GamePort device error
0x00008013	Recoverable	Keyboard device error
0x00008014	Recoverable	TrackDisk device error
0x00008015	Recoverable	Timer device error
0x00008020	Recoverable	CIA resource error
0x00008021	Recoverable	Disk resource error
0x00008022	Recoverable	Misc resource error
0x00008030	Recoverable	BootStrap error
0x00008031	Recoverable	Workbench error
0x00008032	Recoverable	DiskCopy error
0x00008033	Recoverable	GadTools error
0x00008035	Recoverable	Unknown error