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mg_notes:apple_ii_atlk:iigs_netboot [2018/01/23 15:10] M.G. |
mg_notes:apple_ii_atlk:iigs_netboot [2018/01/26 12:26] M.G. [Boot Stages] |
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| The Apple IIgs network boot happens in multiple stages. They are: | The Apple IIgs network boot happens in multiple stages. They are: | ||
| - | **Stage 0 - ROM:** The system has a very minimal AppleTalk stack built into the ROM. It is capable of NBP lookups, ATP, and the lower level protocols to support these, and not much else. The stage 0 code performs an NBP lookup for ''Apple %%//%%gs''. When it finds it, it retrieves the stage 1 code using ATP requests in the same fashion to how the Workstation Card retrieves its boot blocks. The image is usually called ''ProDOS16 Boot Blocks'' | + | **Stage 0 - ROM:** The system has a very minimal AppleTalk stack built into the ROM. It is capable of NBP lookups, ATP, and the lower level protocols to support these, and not much else. The stage 0 code performs an NBP lookup for ''Apple %%//%%gs''. When it finds it, it retrieves the stage 1 code using ATP requests in the same fashion as the Workstation Card retrieves its boot blocks. The image is usually called ''ProDOS16 Boot Blocks'' |
| **Stage 1:** The stage 1 code is a small program with two purposes: It initializes an Apple II Ethernet Card, if installed, and patches it into the toolbox in a rudimentary fashion, and it uses ATP to load the stage 2 code from the server found by the stage 0 code, in usual manner. | **Stage 1:** The stage 1 code is a small program with two purposes: It initializes an Apple II Ethernet Card, if installed, and patches it into the toolbox in a rudimentary fashion, and it uses ATP to load the stage 2 code from the server found by the stage 0 code, in usual manner. | ||
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| The first block is a header block beginning with ''GSOSBOOT'' at $000, and at $100 are the segment descriptors that tell how each of the embedded files is to be loaded. | The first block is a header block beginning with ''GSOSBOOT'' at $000, and at $100 are the segment descriptors that tell how each of the embedded files is to be loaded. | ||
| - | The contents of a standard GS/OS ''ProDOS16 Image'' are below. Note that the images are not named int he file, these are names that I have gotten from other sources or from analysis of the contents. | + | The contents of a standard GS/OS ''ProDOS16 Image'' are below. Note that the images are not named in the file, these are names that I have gotten from other sources or from analysis of the contents. |
| <code> | <code> | ||