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 ?
Among all unspecified neuroinfectious deaths, the most common unspecified neuroinfectious death code used was G03.
The source of this information was the cause of death code (ICD9 185) as captured in the Ontario Cancer Registry.
This underlying cause of death selection mechanism was developed to replace the former one which, when selecting the underlying cause of death, transformed ICD-10 references into ICD-9 ones and, after selection, modified the underlying cause of death code back to ICD-10.
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.
If so, perhaps researchers can use the death code to kill tumor cells.
A diabetes death was defined as one with an International Classification of Diseases, Tenth Revision underlying cause of death code of E10-E14.
A diabetes death was defined as a death with an underlying ICD-8 cause of death code of 250.
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.
Additional fields from the Australian Bureau of Statistics (ABS), and provided in the NCIS, include cause of death codes classified to the International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10).
acknowledge the value of the cause of death codes in the National Coroners Information System, while highlighting some limitations with the collection.
ALS deaths were defined as decedents with underlying or contributing cause of death codes 335.
Even where a coronial finding exists, documents do not always contain sufficient data to assign the most complete causes of death codes possible.