Programmer's key: Difference between revisions

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{{Short description|Macintosh System Switch}}

{{refimprove|date=September 2018}}

[[Image:Macintosh Classic II Left Side Reset Interrupt Switch.jpg|thumb|250px|The interrupt button/programmer's key protruding from the air vent on the left-hand side of an Apple [[Macintosh Classic II]] computer (on the left, above the circular symbol)]]

The '''programmer's key''', or ''interrupt button'', is a button or switch on MacOS[[Classic Mac OS]]-era [[Apple Macintosh|Macintosh]] systems, which jumps to a [[machine code monitor]]. The symbol on the button is ⎉: {{unichar|2389|html=}}. On most [[68000 family]] based Macintosh computers, an interrupt request can also be sent by holding down the ''command'' key and strikingpressing the ''power'' key on the keyboard. This effect is also simulated by the 68000 environment of the [[Mac OS nanokernel]] on PowerPC machines and the [[Classic environment]].

Pressing the interrupt button during startup crashes the system and displays the [[Sad Mac]].

A plastic insert came with [[Macintosh 128K]], [[Macintosh 512K]], and [[Macintosh Plus]] computers that could be attached to the exterior of the case and was used to press an interrupt button located on the motherboard.<ref>{{cite web |url=https://www.hardwaresecrets.com/inside-the-macintosh-plus/4/ |title=Inside the Macintosh Plus |first=Gabriel |last=Torres |date=January 2, 2013 |website=Hardware Secrets |accessdate=September 18, 2018}}</ref><ref>{{cite web |url=https://www.macobserver.com/tmo/article/happy-birthday-mac-how-to-recover-from-the-dreaded-bomb-box-error-message |title=Happy Birthday, Mac - How to Recover From the Dreaded Bomb Box Error Message |first=Sandro |last=Cuccia |date=January 25, 2014 |website=The Mac Observer |accessdate=September 18, 2018}}</ref>

A plastic insert came with [[Macintosh 128K]], [[Macintosh 512K]], [[Macintosh Plus]], and [[Macintosh PlusSE]] computers that could be attached to the exterior of the case and was used to press an interrupt button located on the motherboard.<ref>{{cite web |url=https://www.hardwaresecrets.com/inside-the-macintosh-plus/4/ |title=Inside the Macintosh Plus |first=Gabriel |last=Torres |date=January 2, 2013 |website=Hardware Secrets |accessdate=September 18, 2018}}</ref><ref>{{cite web |url=https://www.macobserver.com/tmo/article/happy-birthday-mac-how-to-recover-from-the-dreaded-bomb-box-error-message |title=Happy Birthday, Mac - How to Recover From the Dreaded Bomb Box Error Message |first=Sandro |last=Cuccia |date=January 25, 2014 |website=The Mac Observer |accessdate=September 18, 2018}}</ref>

Modern Mac hardware no longer includes the interrupt button, as the Mac OS X operating system has integrated debugging options. In addition, Mac OS X's protected memory blocks direct patching of system memory (in order to better secure the system).

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==External links==

* [{{webarchive |url=https://wwwweb.fenestratedarchive.netorg/mirrorsweb/Apple%20Technotes%20(As%20of%202002)20040620191308if_/http://developer.apple.com/technotes/tn/tn1136.html |date=June 20, 2004 |title=MicroBug: The ROM Debugger - TN1136]}}

{{DEFAULTSORT:Programmer's Key}}

[[Category:Macintosh articles]]

[[Category:Debugging]]

[[Category:Interrupts]]