How exactly does an amiga start up

[LawlessPPC]

i know the basics ie startup-sequence etc but i want to know what in the amiga roms tells it to run the startup-sequence. What I mean is if you have execute in C: you can type execute S:startup-sequence in amigados and it will boot. but if the system is completely blank how does it execute anything at all   what commands in the rom do this as execute isnt an internal command. The reason for this is I can mount a CD drive with no software intervention. I then want to execute startup-sequence from the cd but with execute not being an internal command I cant. So how exactly do amigas boot as trying to find info is extremely difficult surely I'm not the only person that ever wanted to know.

[LawlessPPC]

if the cddrive spun up in time I would be able to boot from it but the disk isnt recognised in time so system thinks nothing there and proceeds to hardrive. I just want to be able to run startup-sequnce from cd drive on a blank system but without the execute command available i need to know how the amiga would normally do this. Because execute isnt internal

[LawlessPPC]

this is correct but the disk doesnt spin up fast enough so I have to go in with no boot with no startup-sequence then I want to run the startup sequence from the cd but execute isnt available because other than the cd the system is blank.
I really hope to god I am explaining myself correctly. I just cant seem to get my point across

[LawlessPPC]

thanks very much piru I should have thought if anyone nknew how a miggy booted you would :lol: