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

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

Specific alerts

Exec library

Alert	Type	Description
0x01000000	Recoverable	Exec library error
0x01000001	Recoverable	68000 exception vector checksum OBSOLETE
0x01000002	Recoverable	Execbase checksum error OBSOLETE
0x01000003	Recoverable	Library checksum failure
0x01000004	Recoverable	Interface checksum failure
0x81000005	Dead end	Corrupt memory list detected in FreeMem
0x81000006	Dead end	No memory for interrupt servers
0x01000007	Recoverable	InitStruct() of an APTR source OBSOLETE
0x01000008	Recoverable	A semaphore is in an illegal state at ReleaseSemaphore()
0x01000009	Recoverable	Freeing memory already freed
0x8100000A	Dead end	Illegal 68k exception taken OBSOLETE
0x0100000B	Recoverable	Attempt to reuse active IORequest
0x0100000C	Recoverable	Sanity check on memory list failed during AvailMem(MEMF_LARGEST)
0x0100000D	Recoverable	IO attempted on closed IORequest
0x0100000E	Recoverable	Stack appears to extend out of range
0x0100000F	Recoverable	Memory header not allocated. Usually an invalid address passed to FreeMem()
0x01000010	Recoverable	An attempt was made to use the old message semaphores
0x01000011	Recoverable	A bad memory request was made - Realloc on non-allocated memory
0x01000012	Recoverable	An uninitialized hook was called

Graphics library

Alert	Type	Description
0x02000000	Recoverable	Graphics library error
0x82010000	Dead end	Graphics out of memory
0x82010001	Dead end	MonitorSpec alloc, no memory
0x82010006	Dead end	Long frame, no memory
0x82010007	Dead end	Short frame, no memory
0x02010009	Recoverable	Text, no memory for TmpRas
0x8201000A	Dead end	BltBitMap, no memory
0x8201000B	Dead end	Regions, memory not available
0x82010030	Dead end	MakeVPort, no memory
0x0200000C	Recoverable	New error
0x0200000D	Recoverable	Free error
0x82011234	Dead end	Emergency memory not available
0x02000401	Recoverable	Unsupported font description used

Layers library

Alert	Type	Description
0x03000000	Recoverable	Layers library error
0x83010000	Dead end	Layers out of memory

Intuition library

Alert	Type	Description
0x04000000	Recoverable	Intuition library error
0x84000001	Dead end	Unknown gadget type
0x04000001	Recoverable	Recovery form of AN_GadgetType
0x84010002	Dead end	Create port, no memory
0x04010003	Recoverable	Item plane alloc, no memory
0x04010004	Recoverable	Sub alloc, no memory
0x84010005	Dead end	Plane alloc, no memory
0x84000006	Dead end	Item box top < RelZero
0x84010007	Dead end	Open screen, no memory
0x84010008	Dead end	Open screen, raster alloc, no memory
0x84000009	Dead end	Open sys screen, unknown type
0x8401000A	Dead end	Add SW gadgets, no memory
0x8401000B	Dead end	Open window, no memory
0x8400000C	Dead end	Bad State Return entering Intuition
0x8400000D	Dead end	Bad Message received by IDCMP
0x8400000E	Dead end	Weird echo causing incomprehension
0x8400000F	Dead end	Couldn't open the Console Device
0x04000010	Recoverable	Intuition skipped obtaining a sem
0x04000011	Recoverable	Intuition obtained a sem in bad order

Math library