Mac Error codes
ID=01 Bus Error This means the computer tried to access memory
that doesn't exist. You can get this error on almost any Macintosh
computer. If one of these computers tried to access one or more
bytes beyond the total number of bytes in RAM, you see a bus error.
You should never see this error on a Macintosh Plus or SE, because
address references that are out of bounds "roll over." This means
if one of these computers tries to access one byte beyond the total
bytes in RAM, it actually accesses the first byte in memory. If
you see this error on a Macintosh Plus or SE, it's reporting the
wrong error or experiencing hardware failure.
ID=02 Address Error The Motorola 68000 microprocessor can access
memory in increments of one byte (8 bits), one word (16 bits), or
one long word (32 bits). The microprocessor can access a byte of
information at an odd or even memory address. But it must access
a word or long word at an even memory address. So, when the microprocessor
attempts to read or write a word or long word at an odd address,
you see this error. Since that's a 50/50 proposition when running
random code, this one shows up quite often.
ID=03 Illegal Instruction The computer has a specific vocabulary
of machine language instructions it can understand. If a computer
tries to execute an instruction that isn't in its vocabulary, you
see this error code. It's less likely than error 02, but still very
ID=04 Zero Divide Error This error results if the microprocessor
divides two numbers, and the divisor is zero. Sometimes a programmer
puts these in as debugging aids, and then forgets to take them out.
ID=05 Range Check Error Programmers can use an instruction in
the Motorola 68000 to check if a number is within a certain range.
This error indicates that the number tested isn't in the specified
ID=06 Overflow Error Each number stored in a computer is given
a certain amount of space. The larger the number, the more space
is needed to represent the number. An overflow condition results
if a generated number is too big for its allotted space. A Motorola
68000 instruction tests for an overflow condition, and displays
this error if it detects an overflow.
ID=07 Privilege Violation The Motorola 68000 runs in Supervisor
or User mode. The Macintosh computer should always be in Supervisor
mode, but sometimes is placed in User mode. Some of the instructions
can only be executed in Supervisor mode. If the computer attempts
one of these instructions while in User mode, a Privilege Violation
ID=08 Trace Mode Error A programmer can use a runtime debugger
while in Trace mode. This allows tracing through a program one instruction
at a time. You see this error if a debugger isn't installed and
the 68000 is accidentally placed in Trace mode.
ID=09 and ID=10 Line 1010 & 1111 Trap There are many routines
in the Macintosh ROM that can be called by placing instructions
in a program that aren't in the 68000's vocabulary. When the 68000
encounters such an instruction, it looks it up in the instruction
table. This table gives the location of routines paired with each
instruction. If it finds an entry in the table for the instruction,
it branches to the routine. If there's no entry for the instruction,
you see one of these errors.
ID=12 Unimplemented Core Routine A programmer might set breakpoints
in parts of a program to inspect for errors. This requires using
a debugger. If a debugger isn't installed when a breakpoint occurs,
you see this error code.
ID=13 Uninstalled Interrupt The Macintosh uses an interrupt to
identify when devices like keyboards and disk drives need service.
Routines must be available in memory to tell the computer how to
service the device. If those routines aren't available, you see
ID=15 Segment Loader Error Macintosh programs are broken up into
segments, and each program will always have at least one segment.
Multiple segments allow loading parts of the program into memory
to provide more room for data in internal RAM. The segment loader
is responsible for loading a needed segment into RAM. If the segment
loader can't do this, you'll see this error
ID=17 through ID=24 Missing Packages 0-7 The Macintosh uses packages
to do specific tasks. Some of the packages are International Utilities,
Binary-Decimal Conversion, Standard File Utilities, and Disk Initialization.
These packages are located in the System file. If you get these
errors, you probably have a damaged System file. Error codes 15,
16, 26, 27, 30, and 31 also come up when the System file is damaged.
Try replacing the System file
ID=25 Memory Full Error You've probably run out of RAM. But you
can get this error when an earlier error causes the Macintosh to
falsely detect an out-of-memory condition.
ID=26 Bad Program Launch The computer couldn't execute the application
ID=28 Stack Ran into Heap This is similar to the Memory Full error.
It's a good idea to save your work frequently, and keep current
backups of your hard disk data. When a system crash does occur,
you'll lose less data if you've taken these precautions.