Row of bombs

TOS-based systems, such as the Atari ST, used a row of bombs to indicate a critical system error. The number of bombs displayed revealed information about the occurred error. The error (also called an "exception") is reported by the Motorola 68000 microprocessor.

* 1 bomb: Reset, Initial PC2
* 2 bombs: Bus Error
* 3 bombs: Address Error
* 4 bombs: Illegal Instruction
* 5 bombs: Zero Divide
* 6 bombs: CHK Instruction
* 7 bombs: TRAPV Instruction
* 8 bombs: Privilege Violation
* 9 bombs: Trace
* 10 bombs: Line 1010 Emulator
* 11 bombs: Line 1111 Emulator
* 12–13 bombs: [unassigned, reserved]
* 14 bombs: Format Error
* 15 bombs: Uninitialized Interrupt Vector
* 16–23 bombs: [unassigned, reserved]
* 24 bombs: Spurious Interrupt
* 25 bombs: Level 1 Interrupt Autovector
* 26 bombs: Level 2 Interrupt Autovector
* 27 bombs: Level 3 Interrupt Autovector
* 28 bombs: Level 4 Interrupt Autovector
* 29 bombs: Level 5 Interrupt Autovector
* 30 bombs: Level 6 Interrupt Autovector
* 31 bombs: Level 7 Interrupt Autovector
* 32–47 bombs: Trap Instruction Vectors
* 48–63 bombs: [unassigned, reserved]
* 64–255 bombs: User Interrupt Vectors

See also

References

* [http://www.chebucto.ns.ca/Technology/ACGC/info/faq/faq1.html FAQ for comp.sys.atari.st]
* [http://www.freescale.com/files/archives/doc/ref_manual/M68000PRM.pdf Programmer’s Reference Manual for the Motorola 68000 family]