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64 lines
3.3 KiB
ReStructuredText
64 lines
3.3 KiB
ReStructuredText
========================
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Upgrading from version 8
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========================
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How to upgrade older programs written for Prog8 version 8 or earlier to version 9.
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``cx16diskio`` is now just ``diskio``
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The ``cx16diskio`` module is gone, just use ``diskio``. The drivenumber is no longer a parameter on all routines.
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* replace all imports and references to ``cx16diskio`` with just ``diskio``
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* remove all drive number arguments from the calls. If you're not using drive 8, set the correct drive
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with a call to ``diskio.set_drive()``. Read the active drive from ``diskio.drivenumber``.
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* replace load calls that use a ram bank argument by setting the ram bank first using ``cx16.rambank()``
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and then call the load routine normally.
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@Pc param and return value is now always ``bool``
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Parameters and return values passed via the carry status flag (@Pc) now need to be declared as ``bool``.
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(Previously also ``ubyte`` was allowed but as the value is just a single bit, this wasn't really correct)
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Standard Commodore kernal calls moved to ``cbm``
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Instead of ``c64``, the CBM compatible kernal calls (such as CHROUT) and a bunch of variables, are now
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located in the ``cbm`` module. You don't have to import this module as it is part of the syslib.
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* replace all references such as ``c64.CHROUT`` with the ``cbm`` module instead to fix those undefined symbol errors.
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some routines moved to ``sys``
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Several routines have been moved to the ``sys`` module rather than being in ``c64`` or ``cx16`` for instance.
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An example is ``set_irq()``. If you fixed the previous item above, and still get undefined symbol errors,
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the routine is likely now located in the ``sys`` module so simplychange its prefix to ``sys.``
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for loop range checking to avoid wrap-around looping
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Modify any for loops that depend on a 'wrap-around' loop where the from value lies
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outside of the the loop range (for example: a loop from $fe to $02 which used to loop through $fe, $ff, $00, $01 and $02).
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For loops now do a check at the start and skip the whole loop if the start value is already outside of the range.
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This is the normal behavior of most other programming languages.
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divmod(), sqrt() and abs() builtin functions accept multiple data types
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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- ``divmodw()`` doesn't exist anymore, just use ``divmod()``.
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- ``sqrt16()`` doesn't exist anymore, just use ``sqrt()``.
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- ``floats.fabs()`` and ``floats.sqrt()`` don't exist anymore, just use ``abs()`` and ``sqrt()`` they now accept floating point as well.
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min(), max() and clamp() are new builtin functions
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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If you used symbols named ``min`` or ``max`` or ``clamp``, you have to choose a new name as these are now
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reserved for these new builtin functions.
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Code that uses an if statement and a comparison to determine the greater or lesser of two values,
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can now *sometimes* be optimized by just using one of these new builtin functions. (But sometimes
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just using a simple if statement results in more efficient code. If your goal is fastest code,
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compare both approaches!)
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For floats, use ``floats.minf()``, ``floats.maxf()`` and ``floats.clampf()``.
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