223cc6685e
git-svn-id: svn://svn.compuextreme.de/Viitor/V963/Viitor_cc65@5933 504e572c-2e33-0410-9681-be2bf7408885
53 lines
1.8 KiB
HTML
53 lines
1.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20">
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<TITLE>cc65 Library Overview: Target specific stuff</TITLE>
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<LINK HREF="library-5.html" REL=next>
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<LINK HREF="library-3.html" REL=previous>
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<LINK HREF="library.html#toc4" REL=contents>
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</HEAD>
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<BODY>
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<A HREF="library-5.html">Next</A>
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<A HREF="library-3.html">Previous</A>
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<A HREF="library.html#toc4">Contents</A>
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<HR>
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<H2><A NAME="s4">4.</A> <A HREF="library.html#toc4">Target specific stuff</A></H2>
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<P>For each supported system there's a header file that contains calls or defines
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specific for this system. So, when programming for the C64, include c64.h, for
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the C128, include c128.h and so on. To make the task for the Commodore systems
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easier, there is also a header file named cbm.h that will define stuff common
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for all CBM systems, and include the header file for the specific target
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system.</P>
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<P>The header files contain</P>
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<P>
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<UL>
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<LI>Defines for special keys (like function keys)
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</LI>
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<LI>Defines for special characters (like the graphics characters)
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</LI>
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<LI>Variables with a fixed address in memory that may be used to access
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special hardware. For the C64 and C128 there is a variable struct named
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<CODE>SID</CODE>. Writing to the fields of this struct will write to the SID device
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instead. Using these variables will make your program more readable and more
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portable. Don't fear ineffective code when using these variables, the
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compiler will translate reads and writes to these structs into direct memory
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accesses.
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</LI>
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<LI>Other routines that make only sense for a specific system. One example
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are routines to write memory locations in the system bank for the CBM PET-II
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family.
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</LI>
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</UL>
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</P>
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<HR>
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<A HREF="library-5.html">Next</A>
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<A HREF="library-3.html">Previous</A>
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<A HREF="library.html#toc4">Contents</A>
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</BODY>
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</HTML>
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