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Old 26 May 2013, 00:14   #52
Join Date: Jul 2008
Location: Sweden
Posts: 2,219
Originally Posted by amiman99 View Post
What's in the ROM, specifically what is the file structure in side the ROM?
What is executed firs in the ROM, and how does the computer know to execute that specific file?
Elaborating a bit from what Mrs. Beanbag wrote:

The ROM holds the core operating system modules like Exec, DOS, Intuition and other libraries, drivers for mouse, keyboard, disk drive, the file system, etc.

The structure of each module is a header used to identify the module as such, along with other data such as name, where to look for the next module, etc., and all the modules concatenated is what makes up the ROM.

When the Amiga is turned on, the CPU will read an address from the ROM pointing into the Exec and start execution from there, and Exec then performs some basic initialization and runs the remaining modules.
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