death code

death code

A routine whose job is to set everything in the computer - registers, memory, flags - to zero, including that portion of memory where it is running; its last act is to stomp on its own "store zero" instruction. Death code isn't very useful, but writing it is an interesting hacking challenge on architectures where the instruction set makes it possible, such as the PDP-8 or the Data General Nova.

Perhaps the ultimate death code is on the TI 990 series, where all registers are actually in RAM, and the instruction "store immediate 0" has the opcode 0. The program counter will immediately wrap around core as many times as it can until a user hits HALT. Any empty memory location is death code. Worse, the manufacturer recommended use of this instruction in startup code (which would be in ROM and therefore survive).
References in periodicals archive ?
Then, in 1969, due to the alarming increase in these unexplained deaths, "sudden infant death" was defined as a "syndrome" (SIDS) and assigned an International Classification of Death code (ICD 798.
The source of this information was the cause of death code (ICD9 185) as captured in the Ontario Cancer Registry.
If so, perhaps researchers can use the death code to kill tumor cells.
Allis refers to these two distinct histone markings as life codes and death codes.
For all coronial deaths, the ABS assigns ICD-10 cause of death codes.
The study arose from a larger Victorian study examining coronial data for which ICD-10 cause of death codes was a key variable.
Concordance of ICD-10 External Cause of Death Codes
After excluding the deaths with missing and natural cause of death codes, there were 6,214 deaths remaining in the study extract with an ICD-10 external cause code, either as the UCoD or MCoD.
acknowledge the value of the cause of death codes in the National Coroners Information System, while highlighting some limitations with the collection.
Reliability of ICD-10 external cause of death codes in the National Coroners Information System.
Even where a coronial finding exists, documents do not always contain sufficient data to assign the most complete causes of death codes possible.
The utility of mortality data is often limited by the use of nonspecific cause of death codes, such as those for heart failure, which is actually a mode of death and not a cause.