mirror of https://github.com/cc65/cc65.git
162 lines
4.3 KiB
Plaintext
162 lines
4.3 KiB
Plaintext
<!doctype linuxdoc system>
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<article>
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<title>Watara Supervision specific information for cc65
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<author><url url="mailto:polluks@sdf.lonestar.org" name="Stefan A. Haubenthal">
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<abstract>
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An overview over the Supervision 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 Supervision runtime system as it comes
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with the cc65 C compiler. It describes the memory layout, Supervision specific header
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files, available drivers, and any pitfalls specific to that platform.
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Please note that Supervision 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 information.
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<sect>Binary format<p>
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The standard binary output format generated by the linker for the Supervision target
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is a 2×16 kbyte machine language program. It is of course
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possible to change this behaviour by using one of the different linker configs.
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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 enabled,
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which gives a usable memory range of $8000 - $FFF9.
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More ROM may need additional bankswitching 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 VRAM $4000.-->
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No conio support is currently available for the Supervision.
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<tag/Stack/
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The C runtime stack is located at $1FFF 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 Supervision specific code may use the <tt/supervision.h/ header file.
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<sect1>Hardware access<p>
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The following pseudo variables declared in the <tt/supervision.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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<tag><tt/IO/</tag>
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The <tt/IO/ defines allow access to the IO chip.
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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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No graphics drivers are currently available for the Supervision.
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<!--A TGI driver for the standard graphics mode (160×160 in 4 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 <url 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 Supervision.
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<sect1>Joystick drivers<p>
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<descrip>
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<tag><tt/supervision-stdjoy.joy (supervision_stdjoy_joy)/</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 Supervision.
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<sect1>RS232 device drivers<p>
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No communication port drivers are currently available for the Supervision.
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<sect>Limitations<p>
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<sect1>Disk I/O<p>
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The existing library for the Supervision doesn't implement C file
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I/O. There are even 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>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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<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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