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180 lines
4.9 KiB
Plaintext
180 lines
4.9 KiB
Plaintext
<!doctype linuxdoc system>
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<article>
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<title>Atari Lynx specific information for cc65
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<author>Karri Kaksonen, <htmlurl url="mailto:karri@sipo.fi" name="karri@sipo.fi">
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Ullrich von Bassewitz, <htmlurl url="mailto:uz@cc65.org" name="uz@cc65.org">
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<date>2004-10.14
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<abstract>
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An overview over the Atari Lynx runtime system as it is implemented for the
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cc65 C compiler.
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</abstract>
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<!-- Table of contents -->
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<toc>
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<!-- Begin the document -->
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<sect>Overview<p>
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This file contains an overview of the Atari Lynx runtime system as it comes
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with the cc65 C compiler. It describes the memory layout, Lynx specific header
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files, available drivers, and any pitfalls specific to that platform.
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Please note that Lynx specific functions are just mentioned here, they are
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described in detail in the separate <htmlurl url="funcref.html" name="function
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reference">. Even functions marked as "platform dependent" may be available on
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more than one platform. Please see the function reference for more
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information.
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<sect>Binary format<p>
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The standard binary output format generated by the linker for the VIC20 target
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is a machine language program with a one line BASIC stub. This means that a
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program can be loaded as BASIC program and started with RUN. It is of course
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possible to change this behaviour by using a modified startup file and linker
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config.
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<sect>Memory layout<p>
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cc65 generated programs with the default setup run with the I/O area and the
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kernal and BASIC ROM enabled (RAM at $A000 - $BFFF may be used
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for the heap), which gives a usable memory range of $1000 - $1DFF.
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All ROM entry points may be called directly without additional code.
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Special locations:
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<descrip>
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<tag/Text screen/
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The text screen is located at $1E00 (as in the standard setup).
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<tag/Stack/
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The C runtime stack is located at $1DFF and growing downwards.
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<tag/Heap/
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The C heap is located at the end of the program and grows towards the C
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runtime stack.
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</descrip><p>
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<sect>Platform specific header files<p>
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Programs containing Lynx specific code may use the <tt/lynx.h/ header file.
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<sect1>Lynx specific functions<p>
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<itemize>
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<item>lynx_change_framerate
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<item>lynx_eeprom_erase
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<item>lynx_eeprom_read
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<item>lynx_eeprom_write
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</itemize>
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<sect1>Hardware access<p>
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The following pseudo variables declared in the <tt/lynx.h/ header file do
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allow 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.
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<descrip>
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<tag><tt/MIKEY/</tag>
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The <tt/MIKEY/ structure allows access to MIKEY chip. See the <tt/_mikey.h/
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header file located in the include directory for the declaration of the
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structure.
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<tag><tt/SUZY/</tag>
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The <tt/SUZY/ structure allows access to SUZY chip. See the <tt/_suzy.h/
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header file located in the include directory for the declaration of the
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structure.
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</descrip><p>
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<sect>Loadable drivers<p>
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<sect1>Graphics drivers<p>
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A TGI driver for the standard graphics mode (160*102 in 16 colors) is
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available, but must be statically linked, because no file I/O is available.
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See the documentation for the <htmlurl url="co65.html" name="co65 utility">
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for information on how to do that.
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<sect1>Extended memory drivers<p>
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No extended memory drivers are currently available for the Lynx.
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<sect1>Joystick drivers<p>
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A joystick driver for the standard buttons is available, but must be
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statically linked, because no file I/O is available. See the documentation for
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the <htmlurl url="co65.html" name="co65 utility"> for information on how to do
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that.
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<sect1>Mouse drivers<p>
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No mouse drivers are currently available for the Lynx.
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<sect1>RS232 device drivers<p>
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No serial drivers are currently available for the Lynx.
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<sect>Limitations<p>
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<sect>Other hints<p>
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<sect>Bugs/Feedback<p>
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If you have problems using the library, if you find any bugs, or if you're
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doing something interesting with it, I would be glad to hear from you. Feel
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free to contact me by email (<htmlurl url="mailto:uz@cc65.org"
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name="uz@cc65.org">).
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<sect>License<p>
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This software is provided 'as-is', without any expressed or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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<enum>
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<item> The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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<item> Altered source versions must be plainly marked as such, and must not
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be misrepresented as being the original software.
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<item> This notice may not be removed or altered from any source
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distribution.
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</enum>
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</article>
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