Amiga tech


* Copyright 1988 Commodore-Amiga, Inc.
* This information is provided "as is"; no warranties are made.  All
* use is at your own risk. No liability or responsibility is assumed.
* Permission granted to reproduce, provided this notice remains.

                              IMPORTANT !   

       Official Warning to Rom-Jumpers, Structure-Hackers, and Others
       ==============================================================
          From Commodore Engineering, Commodore-Amiga, and C.A.T.S.

     We who bring you the Amiga want to make it perfectly clear that
if you don't follow the rules, you WILL break. 

     The following practices are NOT supported !
       - Jumping directly to ROM code
       - Modifying or depending on private system structures
       - Depending on the addresses of system structures or free memory
       - Ignoring hardware or software interfacing specifications


     Do not jump into ROM.  Beware of any example code that calls routines
in the $F80000 to $FFFFFF range.  Those are ROM addresses and those ROM
routines WILL move.   The only supported interface to system ROM code
is through the provided library, device, and resource calls.

     Do not modify or depend on the format of the private system structures.
This includes the poking of copper lists, memory lists, and library bases.

     Do not depend on any address containing any particular system structure
or type of memory.  The system modules dynamically allocate their memory
space when they are initialized.  The addresses of system structures and
buffers differ with every OS, every model, and every configuration, as
does the amount of free memory and system stack usage.

     If you are using the system libraries, devices, and resources, you
must follow the defined interface.  Assembler programmers (and compiler
writers) must enter functions through the library base jump tables,
with arguments passed as longs and library base address in A6.  Results
returned in D0 must be tested, and the contents of D0-D0/A0-A1 must be
assumed gone after a system call.  Do not use the TAS instruction.

     Do not use assembler instructions which are priviledged on any
68000 family processor.  All addresses must be 32 bits.  Do not use
the upper 8 bits for other data.  Do not execute code on your stack
or put shared system or DOS structures on your stack.  And do not use
processor dependent software timimg loops for delays.

     If you are programming at the hardware level, you must follow hardware
interfacing specifications.  All hardware is NOT the same.  Do not assume
that low level hacks for speed or copy protection will work on all drives,
or all keyboards, or all systems, or future systems. 


     Software distributers who purchase or contract software from
outside programmers must make sure that the programmers are aware
of correct programming practices and are providing software which
will not break on different machines or different OS revisions.


     We are dedicated to enhancing and expanding the capabilities of
the Amiga hardware and software, while maintaining compatibility
wherever possible for those who follow the rules.  Those who don't
follow the rules cans consider themselves warned.




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