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{{Short description|Macintosh System Switch}}
{{refimprove|date=September 2018}}
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The '''programmer's key''', or ''interrupt button'', is a button or switch on [[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 pressing 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
A plastic insert came with [[Macintosh 128K]], [[Macintosh 512K]], [[Macintosh Plus]], and [[Macintosh SE]] 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>
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