In the beginning of the file there is the magic cookie, then is declared the total number of hunks in the executable, and just after this is the progressive numbers of hunks starting from "0" (zero). The internal structure of an Amiga executable file is very simple. ( May 2015) ( Learn how and when to remove this template message) There might be a discussion about this on the talk page. In particular, it does not clearly explain what the file header actually consists of. This section may be confusing or unclear to readers. This kind of solution to identify executables on the Amiga was taken from similar solutions which were adopted by UNIX/ Unix-like operating systems, where magic cookies are called magic numbers. This sequence, which signifies an executable file and lets it be self-running, is called a magic cookie (from the magic cookies in Alice's Adventures in Wonderland by Lewis Carroll). There is a particular sequence of bytes in the file header, yielding the hexadecimal value $000003f3. These are all valid names for programs or tools, because AmigaOS does not differentiate between filename extensions.ĪmigaOS adopted another method to recognize it is dealing with a valid executable. For example, the calculator applet " Calculator" can be renamed to " ", " Calculator.exe", " Calculator.bin", or even " Calculator.jpeg". No particular filename extension is required for Amiga executable files.
#AMIGA OS 3.9 FASTATA STARTUP SEQUENCE CODE#
The structure of an Amiga hunk is very simple: There is a header at the beginning of the hunk indicating that that kind of "portion of code" is a known and valid Amiga hunk type, then follows an ID which indicates the length of the hunk itself, and at the bottom is the segment of the hunk which contains the real code or data.įeatures of Amiga executable files Īmiga executable files can be launched either from the graphical shell of the Amiga, the Workbench or from the Amiga's command line interpreter (called CLI, later AmigaShell). Their structure was officially codified and could be changed only by a Commodore committee, which then communicated the modifications to the developers for new releases of the Amiga operating system.
#AMIGA OS 3.9 FASTATA STARTUP SEQUENCE HOW TO#
Types of hunks were standardized in AmigaOS, and well documented in The AmigaDOS Manual edited by Commodore to explain to programmers how to code on the Amiga, during the years in which Commodore manufactured Amiga computers. There are 32-bit hunks, 16-bit hunks, and even some 8-bit hunks. The hunks in an Amiga executable file could exist in various types.
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