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 ?
The cause of death code is selected from the Child PIP Cause of Death (CoD) Code List (Appendix 2), which is an abbreviated list based loosely on the ICD-10.
Among all unspecified neuroinfectious deaths, the most common unspecified neuroinfectious death code used was G03.9 meningitis unspecified (n = 505) (Table).
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 798.0).
If so, perhaps researchers can use the death code to kill tumor cells.
([dagger]) Prostate cancer deaths were those with the International Classification of Diseases, Tenth Revision (ICD-10) underlying cause of death code C61.
Decedents whose cause of death code was J62.8 most frequently worked in the manufacturing and construction industries and production occupations where silica exposure is known to occur.
A diabetes death was defined as a death with an underlying ICD-8 cause of death code of 250.0 or 250.9 for the years 1968-1978; ICD-9 codes of250.0-250.9 for the years 1979-1998, and ICD-10 codes of E10-E14 for the years 1999-2009.
Deaths were identified using International Classification of Diseases, Tenth Revision (ICD-10) underlying cause of death codes V90-V94 (water transport).
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.
"European brain death codes: a comparison of national guidelines", J.