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Text of the page (random words):
killer poke wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 specific examples toggle specific examples subsection 1 1 zuse z1 z3 1 2 commodore pet 1 3 commodore 1541 disk drive 1 4 lg cd rom drives 1 5 flash memory 1 6 msi laptops uefi 1 7 samsung galaxy displays 2 see also 3 references 4 external links toggle the table of contents killer poke 1 language polski edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia software means of causing computer hardware damage in computer jargon a killer poke is a method of inducing physical hardware damage on a machine or its peripherals by the insertion of invalid values via for example basic s poke command into a memory mapped control register the term is typically used to describe a family of fairly well known tricks that can overload the analog electronics in the crt monitors of computers lacking hardware sanity checking notable examples being the ibm portable 1 and commodore pet specific examples edit zuse z1 z3 edit the z1 1938 and z3 1941 computers built by konrad zuse contained illegal sequences of instructions which damaged the hardware if executed by accident 2 commodore pet edit the pet specific killer poke is connected to the architecture of that machine s video rasterizer circuits in early pets writing a certain value to the memory address of a certain i o register poke 59458 62 3 made the machine able to display text and graphics on the screen 106 faster this was accomplished by disabling a wait to print to screen safeguard designed to reduce static noise by preventing the shared vram from being read by the display at the same time as it was being written to by the cpu with this safeguard disabled graphics could appear on the screen twice as fast but small bits of static would also appear despite the static some games designed for early pets included this poke in their source code in order to benefit from the faster graphics 1 when the pet range was revamped with updated hardware the video rasterizer circuits were redesigned to run at a faster speed and without the need for a wait to print safeguard thus the old poke trick no longer resulted in faster graphics instead performing the old trick on the new hardware led to strange behavior by the new video chip which could cause signal contention and possibly damage the pet s integrated crt monitor 4 this is because the exact pin targeted by the poke command used to control display timing but in the upgraded video chip that pin controlled the vertical sync thus running the poke on the newer hardware caused graphics to compress vertically sometimes down to an extremely bright horizontal line fears that this anomaly might burn in to the display led to the nickname killer poke 3 however it is not known to have ever caused any permanent damage to the monitor 5 commodore 1541 disk drive edit the commodore 64 had an optional external 5 1 4 floppy drive the commodore 1541 contained a 6502 microprocessor which was used to run commodore dos and also to manage the drive mechanism the drives stored data on 35 tracks 0 34 and the stepper motor could be manually controlled through basic by print ing memory write commands to the drive which correspond to the poke command of basic but write to the drive s internal memory and i o registers not those of the computer itself if the drive was at either end of its range track 0 or track 39 and it was commanded to continue moving there was no software or firmware method to prevent drive damage continued knocking of the drive head against the stop would throw the mechanism out of alignment 6 the problem was exacerbated by copy protection techniques that used non standard disk formats with unusual track counts the commodore 1571 had an optical head stop instead of a mechanical one lg cd rom drives edit certain models of lg cd rom drives with specific firmware used an abnormal command for update firmware the clear buffer command usually used on cd rw drives linux uses this command to tell the difference between cd rom and cd rw drives most cd rom drives dependably return an error for the unsupported cd rw command but the faulty drives interpreted it as update firmware causing them to stop working or in casual parlance to be bricked 7 flash memory edit the resource of flash memory is large but limited since writing to storage is an essential operation most applications have enough privileges to exhaust the resource of flash chips within 24 hours by filling the storage enough to cause write amplification and continuously rewriting a small file 8 msi laptops uefi edit systemd mounts variables used by unified extensible firmware interface on linux system s sysfs as writable by the root user of a system as a result it is possible for the root user of a system to completely brick a system with a non conforming uefi implementation specifically some msi laptops by using the rm command to delete the sys firmware efi efivars directory or recursively delete the root directory 9 better source needed samsung galaxy displays edit a number of samsung galaxy devices have been reported to be affected by a firmware update whose display drivers pushed the screen beyond its limits and incurred irreversible damage to the amoled displays used on the phones leaving permanent green or pink lines on the screens after updating to the latest one ui software 10 11 see also edit stuxnet malware designed to cause physical wear in industrial centrifuges bricking the act of misconfiguring a device so as to make it cease functioning cih computer virus a virus that can flash the bios halt and catch fire a less destructive operation which halts the cpu but can usually be recovered by power cycling references edit 1 2 computing myth 1 software cannot damage hardware oldskooler ramblings 2 february 2006 archived from the original on 23 february 2011 retrieved 28 december 2010 rojas raúl april june 1997 konrad zuse s legacy the architecture of the z1 and z3 pdf ieee annals of the history of computing 19 2 5 16 9 10 doi 10 1109 85 586067 archived pdf from the original on 3 july 2022 retrieved 3 july 2022 p 10 there are a lot of details that the engineer designing the microprogram must keep in mind otherwise short circuits can destroy the hardware the z1 with its mechanical design was still more sensitive in this respect than the z3 even after it was completed there were sequences of instructions that the programmer had to avoid in order not to damage the hardware one of those sequences was inadvertently tried at the berlin museum of technology and transportation which led to slight damaging of the reconstructed z1 in 1994 12 pages 1 2 commodore pet 2001 computer oldcomputers net archived from the original on 1 january 2011 retrieved 10 january 2011 fachat andré killer poke pet index 6502 org archived from the original on 9 november 2010 retrieved 10 november 2010 the killer poke archived from the original on 11 december 2021 full text of compute gazette issue 16 compute s gazette retrieved 11 june 2026 re lg cdroms newbie linux mandrake com the mail archive 29 october 2003 archived from the original on 30 september 2010 retrieved 29 december 2009 zhang tao zuck aviad porter donald e tsafrir dan 12 june 2019 apps can quickly destroy your mobile s flash why they don t and how to keep it that way proceedings of the 17th annual international conference on mobile systems applications and services mobisys 19 the 17th annual international conference on mobile systems applications and services seoul republic of korea acm pp 207 221 doi 10 1145 3307334 3326108 isbn 978 1 4503 6661 8 retrieved 14 august 2025 mount efivarfs read only issue 2402 systemd systemd github 21 january 2016 archived from the original on 23 october 2016 retrieved 9 november 2016 green lines strike back galaxy s23 users report display issues after one ui 8 5 update samfw com retrieved 17 june 2026 be careful galaxy s23 users complain of green line issue after one ui 8 5 update android authority 15 june 2026 retrieved 17 june 2026 external links edit commodore pet killer poke discussion retrieved from https en wikipedia org w index php title killer_poke oldid 1359792198 categories computer jargon hardware bugs denial of service attacks hidden categories articles with short description short description matches wikidata use dmy dates from august 2021 all articles lacking reliable references articles lacking reliable references from march 2024 this page was last edited on 17 june 2026 at 06 26 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents killer poke 1 language add topic