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100 lines
2.8 KiB
HTML
100 lines
2.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20">
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<TITLE>Commodore VIC20 (aka VC20) specific information for cc65: Platform specific header files</TITLE>
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<LINK HREF="vic20-5.html" REL=next>
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<LINK HREF="vic20-3.html" REL=previous>
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<LINK HREF="vic20.html#toc4" REL=contents>
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</HEAD>
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<BODY>
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<A HREF="vic20-5.html">Next</A>
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<A HREF="vic20-3.html">Previous</A>
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<A HREF="vic20.html#toc4">Contents</A>
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<HR>
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<H2><A NAME="s4">4.</A> <A HREF="vic20.html#toc4">Platform specific header files</A></H2>
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<P>Programs containing VIC20 specific code may use the <CODE>vic20.h</CODE> or <CODE>cbm.h</CODE>
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header files. Using the later may be an option when writing code for more than
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one CBM platform, since it includes <CODE>vic20.h</CODE> and declares several functions
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common to all CBM platforms.</P>
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<H2><A NAME="ss4.1">4.1</A> <A HREF="vic20.html#toc4.1">VIC20 specific functions</A>
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</H2>
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<P>There are currently no special VIC20 functions.</P>
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<H2><A NAME="ss4.2">4.2</A> <A HREF="vic20.html#toc4.2">CBM specific functions</A>
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</H2>
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<P>Some functions are available for all (or at least most) of the Commodore
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machines. See the
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<A HREF="funcref.html">function reference</A> for
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declaration and usage.</P>
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<P>
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<UL>
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<LI>cbm_close</LI>
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<LI>cbm_closedir</LI>
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<LI>cbm_k_setlfs</LI>
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<LI>cbm_k_setnam</LI>
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<LI>cbm_k_load</LI>
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<LI>cbm_k_save</LI>
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<LI>cbm_k_open</LI>
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<LI>cbm_k_close</LI>
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<LI>cbm_k_readst</LI>
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<LI>cbm_k_chkin</LI>
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<LI>cbm_k_ckout</LI>
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<LI>cbm_k_basin</LI>
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<LI>cbm_k_bsout</LI>
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<LI>cbm_k_clrch</LI>
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<LI>cbm_load</LI>
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<LI>cbm_open</LI>
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<LI>cbm_opendir</LI>
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<LI>cbm_read</LI>
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<LI>cbm_readdir</LI>
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<LI>cbm_save</LI>
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<LI>cbm_write</LI>
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<LI>get_tv</LI>
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</UL>
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</P>
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<H2><A NAME="ss4.3">4.3</A> <A HREF="vic20.html#toc4.3">Hardware access</A>
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</H2>
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<P>The following pseudo variables declared in the <CODE>vic20.h</CODE> header file do allow
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access to hardware located in the address space. Some variables are
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structures, accessing the struct fields will access the chip registers.</P>
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<P>
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<DL>
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<DT><B><CODE>VIC</CODE></B><DD><P>The <CODE>VIC</CODE> structure allows access to the VIC (the graphics
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controller). See the <CODE>_vic.h</CODE> header file located in the include
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directory for the declaration of the structure.</P>
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<DT><B><CODE>VIA1, VIA2</CODE></B><DD><P>Access to the two VIA (versatile interface adapter) chips is available via
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the <CODE>VIA1</CODE> and <CODE>VIA2</CODE> variables. The structure behind these variables
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is explained in <CODE>_6522.h</CODE>.</P>
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<DT><B><CODE>COLOR_RAM</CODE></B><DD><P>A character array that mirrors the color RAM of the VIC20 at $9600.</P>
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</DL>
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</P>
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<HR>
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<A HREF="vic20-5.html">Next</A>
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<A HREF="vic20.html#toc4">Contents</A>
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