Page History: Converting older MMBASIC programs
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Page Revision: 2020/07/30 13:20
====Tips on converting code from older versions of MMBASIC, e.g. the version for the original Colour Maximite, to the CMM2's current version.
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=Language References
The current CMM2 MMBASIC manual is at ???
Some of the older versions to convert from:
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=Different variable names by type
Many old programs re-use variables with different types. e.g. A and A$. Modern versions of MMBasic (V5 onwards) don't allow this so that is the first thing to fix. e.g they could be A and AStr$ instead.
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=OPTION LEGACY, and PIXEL, LINE, BOX and CIRCLE
You can use OPTION LEGACY ON at the start of a program to continue using the old syntax for the graphics commands: PIXEL, LINE, BOX and CIRCLE.
or you can change the code for the new syntax.
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=MODE
The MODE command has different syntax, and different modes.
Old syntax is
MODE mode (and optional argument, palette)
New syntax is
MODE resolution, bits (and 2 more optional arguments). Setting bits as 8 is the minimum, and plenty more than the old modes.
The old Colour Maximite, modes 1,2,3 have resolution 480 x 432 pixels, which you can match with mode resolution 4 in the Colour Maximite 2.
The old Colour Maximite, mode 4 has resolution 240 x 216 pixels, which you can match with mode resolution 5 in the Colour Maximite 2.
But a different mode may work better in some cases, as the new mode resolution 1 (800x600), 2 (640x400) and 3 (320x200) align properly with the the expected pixel locations of modern LCD displays.
The other modes may appear to have uneven pixel sizes.