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160 lines
4.0 KiB
Plaintext
160 lines
4.0 KiB
Plaintext
<!doctype linuxdoc system>
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<article>
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<title>Gamate System specific information for cc65
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<author>
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<url url="mailto:groepaz@gmx.net" name="Groepaz/Hitmen">
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<date>2015-11-29
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<abstract>
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An overview over the Gamate 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 Gamate runtime system as it comes
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with the cc65 C compiler. It describes the memory layout, Gamate specific header
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files, available drivers, and any pitfalls specific to that platform.
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Please note that Gamate specific functions are just mentioned here, they are
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described in detail in the separate <url 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 Gamate target
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is a cartridge image with header. It is of course possible to change this
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behaviour by using a modified startup file and linker config.
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Note: the first two bytes of the header contain a checksum that must be inserted
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by an external program. Such an utility is provided in util/gamate/gamate-fixcart.c
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<sect>Platform specific header files<p>
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Programs containing Gamate specific code may use the <tt/gamate.h/ header file.
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<sect1>Hardware access<p>
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The following pseudo variables declared in the <tt/gamate.inc/ include file do
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allow access to hardware located in the address space.
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<descrip>
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</descrip><p>
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<sect>Loadable drivers<p>
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All drivers must be statically linked because no file I/O is available.
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The names in the parentheses denote the symbols to be used for static linking of the drivers.
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<sect1>Graphics drivers<p>
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No TGI graphics drivers are currently available for the Gamate.
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<sect1>Extended memory drivers<p>
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No extended memory drivers are currently available for the Gamate.
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<sect1>Joystick drivers<p>
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<descrip>
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<tag><tt/gamate-stdjoy.joy (gamate_stdjoy)/</tag>
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A joystick driver for the standard two buttons joypad is available.
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</descrip><p>
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<sect1>Mouse drivers<p>
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No mouse drivers are currently available for the Gamate.
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<sect1>RS232 device drivers<p>
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No serial drivers are currently available for the Gamate.
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<sect>Limitations<p>
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<itemize>
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<item>When using the C-compiler, keep in mind that only 0x200 bytes RAM in total
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can be used for variables and the runtime stack.
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</itemize>
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<sect1>Disk I/O<p>
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The existing library for the Gamate doesn't implement C file
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I/O. There are no hacks for the <tt/read()/ and <tt/write()/ routines.
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To be more concrete, this limitation means that you cannot use any of the
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following functions (and a few others):
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<itemize>
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<item>printf
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<item>fclose
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<item>fopen
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<item>fread
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<item>fprintf
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<item>fputc
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<item>fscanf
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<item>fwrite
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<item>...
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</itemize>
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<sect>Other hints<p>
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<itemize>
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<item>The Gamate is emulated by MESS (<url url="http://www.mess.org/">),
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run like this: <tt>mess gamate -debug -window -skip_gameinfo -cart test.bin</tt>
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</itemize>
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some resources on the Gamate:
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<itemize>
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<item><url url="http://en.wikipedia.org/wiki/Gamate">
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</itemize>
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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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