223cc6685e
git-svn-id: svn://svn.compuextreme.de/Viitor/V963/Viitor_cc65@5933 504e572c-2e33-0410-9681-be2bf7408885
50 lines
1.8 KiB
HTML
50 lines
1.8 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 610 specific information for cc65: Memory layout</TITLE>
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<LINK HREF="cbm610-4.html" REL=next>
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<LINK HREF="cbm610-2.html" REL=previous>
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<LINK HREF="cbm610.html#toc3" REL=contents>
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<A HREF="cbm610-4.html">Next</A>
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<H2><A NAME="s3">3.</A> <A HREF="cbm610.html#toc3">Memory layout</A></H2>
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<P>cc65 generated programs for the Commodore 610 run in bank 1, the memory bank
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reserved for BASIC programs. Since there are no ROMs in this memory bank, the
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program has almost full 64K for its own. A disadvantage is that kernal
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subroutines cannot be called (at least not in a fast and effective manner), so
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the runtime has replace kernal functionality.</P>
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<P>The default memory configuration for the CBM 610 allocates all memory between
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$0002 and $FFF0 in bank 1 for the compiled program. Some space
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in low memory is lost, because a separate hardware stack is set up in page 1,
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and the kernal replacement functions need some more memory locations. A few
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more bytes are lost in high memory, because the runtime sets up a CBM
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compatible jump table at $FF81. The main startup code is located at
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$0400, so about 63K of the complete bank are actually usable for
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applications.</P>
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<P>Special locations:</P>
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<P>
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<DL>
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<DT><B>Stack</B><DD><P>The C runtime stack is located at $FF81 and growing downwards.</P>
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<DT><B>Heap</B><DD><P>The C heap is located at the end of the program and grows towards the C
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runtime stack.</P>
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</DL>
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</P>
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