Keystrokes for 68k and PPC Macintosh Systems

Command-Shift-1

Force ejects a floppy disk from the first floppy disk drive (internal).​

Thank you, @YMK! ​

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Command-Shift-2

Force ejects a floppy disk from the second floppy disk drive (external or the second internal such as the Mac SE).​

Kudos, @YMK! ​

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D

Forces the internal hard disk drive to be the startup device.​

N

Hold down until the Mac logo to attempt boot from the network server (using BOOTP or TFTP).​

R

Force PowerBooks to reset the screen.​

T

Put the firewire-equipped Mac in firewire target disk mode.​

Z

Attempt to boot using the device alias zip from the first bootable partition found.​

Gracias, @alxlab! ​

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Added the "After the Happy Mac Icon" category.
Control

Break into MacsBug as soon as it is loaded.​

Shift

Disables all extensions, INCLUDING MacsBug.​

Space

Causes Apple's Extension Manager (or Conflict Catcher) to appear during startup to allow you to change your extensions.​

Shift-Option

Disables all extensions, including MacsBug, EXCEPT MacsBug.​

Danke, @rjkucia! ​

If you know of a keystroke during boot, after boot, or applications for the 68k or Power Macintosh systems or need correction, please go to this thread and add the suggestion with a description. I will then update the resource. Thank you.