Re: ATINIT structure

[Marsha <menacechgo@aol.com>]

pererasanjaya@hotmail.com wrote in 
1103601327.351153.281640@f14g2000cwb.googlegroups.com:">news:1103601327.351153.281640@f14g2000cwb.googlegroups.com:

> Hi,
> 
> does anyone has any docs on workstation card and structure of ATINIT.
> like how it modify Prodos pointers to send data through workstation
> card, etc.

from
http://www.apple2world.jp/apple2/FAQ/DataLibrary/ATN/technotes/iigs/TechNot
e-2gs-077.html

The ATInit File Format

The AppleShare Programmer's Guide for the Apple IIGS shows the file format 
of 
the ATInit file as it is stored on an AppleShare boot volume.  However, the 
file format of ATInit is not always as shown in that manual.  In all cases, 
ATInit will contain the three required data fields UserName, PrinterFlags, 
and 
PrinterTuple at the end of the file.  Before those data fields, ATInit may 
also contain executable code or additional data fields.  Since the three 
required data fields are directly before ATInit's end-of-file (EOF), you 
can 
find them relative to ATInit's EOF using the displacements listed in Table 
1.

Displacement to
ATInit EOF          Size      Field Name    Description
___________________________________________________________________________
__
133                 33 Bytes  UserName      A Pascal-type string containing 
                                            the default User Name.  It 
                                            consists of a length byte 
                                            followed by up to 31 bytes of 
                                            ASCII data and a single, unused 
                                            byte.  This field is always 33 
                                            bytes long.
100                 Byte      PrinterFlags  This is the Flags field used by 
                                            the Remote Print Manager's 
                                            default network printer.
99                  99 Bytes  PrinterTuple  This field specifies the name 
of 
                                            the default network printer 
used 
                                            by the Remote Print Manager.  
The 
                                            PrinterTuple field is in 
standard 
                                            Name Binding Protocol (NBP) 
                                            format.  This field is always 
99 
                                            bytes long.
___________________________________________________________________________
__

                  Table 1-Offsets of Required Data Fields

If the ATInit file is on an AppleShare server, it will have 6 additional 
data 
fields (PathVolID, PathDirID, Path, PrefixVolID, PrefixDirID, and Prefix) 
directly before the three required data fields.  These fields can also be 
found relative to ATInit's EOF using the displacements listed in Table 2.

Displacement to
ATInit EOF          Size      Field Name    Description
___________________________________________________________________________
__
275                 Word      PathVolID     The Volume ID number of the 
                                            user's AppleTalk startup 
                                            application.
273                 Long      PathDirID     The Directory ID number of the 
                                            user's AppleTalk startup 
                                            application.
269                 65 Bytes  Path          The Pathname of the user's 
                                            AppleTalk startup application.
204                 Word      PrefixVolID   The Volume ID number of the 
                                            user's AppleTalk default 
prefix.
202                 Long      PrefixDirID   The Directory ID number of the 
                                            user's AppleTalk default 
prefix.
198                 65 Bytes  Prefix        The user's AppleTalk default 
                                            prefix.
___________________________________________________________________________
__