mirror of
https://github.com/cc65/cc65.git
synced 2024-10-31 20:06:11 +00:00
184 lines
4.4 KiB
Plaintext
184 lines
4.4 KiB
Plaintext
<!doctype linuxdoc system>
|
|
|
|
<article>
|
|
|
|
<title>VTech Creativision (aka Funvision) specific information for cc65
|
|
<author><url url="mailto:polluks+cc65@sdf.lonestar.org" name="Stefan A. Haubenthal">
|
|
<date>2017-11-15
|
|
|
|
<abstract>
|
|
An overview over the Creativision runtime system as it is implemented for the
|
|
cc65 C compiler.
|
|
</abstract>
|
|
|
|
<!-- Table of contents -->
|
|
<toc>
|
|
|
|
<!-- Begin the document -->
|
|
|
|
<sect>Overview<p>
|
|
|
|
This file contains an overview of the Creativision runtime system as it comes
|
|
with the cc65 C compiler. It describes the memory layout, Creativision specific header
|
|
files, available drivers, and any pitfalls specific to that platform.
|
|
|
|
Please note that Creativision specific functions are just mentioned here, they are
|
|
described in detail in the separate <url url="funcref.html" name="function
|
|
reference">. Even functions marked as "platform dependent" may be available on
|
|
more than one platform. Please see the function reference for more information.
|
|
|
|
|
|
<sect>Binary format<p>
|
|
|
|
The standard binary output format generated by the linker for the Creativision target
|
|
is a 4 KB ROM image. To create an 8 KB ROM a custom linker script has
|
|
to be used.
|
|
|
|
<sect>Memory layout<p>
|
|
|
|
cc65 generated programs with the default setup are 4 KB in size,
|
|
occupying $B000 - $BFFF. Usable memory space for the
|
|
user program is $B000 - $BEFF. $BF00 -
|
|
$BFFF is reserved for the runtime and cartridge configuration
|
|
area.
|
|
|
|
Special locations:
|
|
|
|
<descrip>
|
|
<tag/Text screen/
|
|
The text screen is located at VRAM $1000.
|
|
|
|
<tag/Stack/
|
|
The C runtime stack is located at $03FF and growing downwards.
|
|
|
|
<tag/RAM/
|
|
The available RAM for cc65 programs of an unexpanded Creativision
|
|
starts at $01FA and ends at $03FF.
|
|
|
|
<tag/Heap/
|
|
The C heap is located at the end of the program's data area and
|
|
grows towards the C runtime stack.
|
|
|
|
</descrip><p>
|
|
|
|
|
|
|
|
<sect>Platform specific header files<p>
|
|
|
|
Programs containing Creativision specific code may use the <tt/creativision.h/ header file.
|
|
|
|
|
|
<sect1>Creativision specific functions<p>
|
|
|
|
<itemize>
|
|
<item>bios_playsound
|
|
<item>psg_delay
|
|
<item>psg_outb
|
|
<item>psg_silence
|
|
</itemize>
|
|
|
|
|
|
|
|
<!--<sect1>Hardware access<p>
|
|
|
|
The following pseudo variables declared in the <tt/creativision.inc/ include file do
|
|
allow access to hardware located in the address space.
|
|
|
|
<descrip>
|
|
|
|
<tag><tt/VDP/</tag>
|
|
The <tt/VDP/ defines allow access to the video chip.
|
|
|
|
</descrip><p>
|
|
|
|
<descrip>
|
|
|
|
<tag><tt/PIA/</tag>
|
|
The <tt/PIA/ defines allow access to the I/O chip.
|
|
|
|
</descrip><p>-->
|
|
|
|
|
|
|
|
<sect>Loadable drivers<p>
|
|
|
|
<sect1>Graphics drivers<p>
|
|
|
|
No graphics drivers are currently available for the Creativision.
|
|
|
|
|
|
<sect1>Extended memory drivers<p>
|
|
|
|
No extended memory drivers are currently available for the Creativision.
|
|
|
|
|
|
<sect1>Joystick drivers<p>
|
|
|
|
<descrip>
|
|
|
|
<tag><tt/creativision-stdjoy.joy (creativisionstd_joy)/</tag>
|
|
A joystick driver for the standard joystick is available.
|
|
|
|
</descrip><p>
|
|
|
|
<sect1>Mouse drivers<p>
|
|
|
|
No mouse drivers are currently available for the Creativision.
|
|
|
|
|
|
<sect1>RS232 device drivers<p>
|
|
|
|
No communication port drivers are currently available for the Creativision.
|
|
|
|
|
|
|
|
<sect>Limitations<p>
|
|
|
|
<sect1>Disk I/O<p>
|
|
|
|
The existing library for the Creativision doesn't implement C file
|
|
I/O. There are even no hacks for the <tt/read()/ and <tt/write()/ routines.
|
|
|
|
To be more concrete, this limitation means that you cannot use any of the
|
|
following functions (and a few others):
|
|
|
|
<itemize>
|
|
<item>fclose
|
|
<item>fopen
|
|
<item>fread
|
|
<item>fprintf
|
|
<item>fputc
|
|
<item>fscanf
|
|
<item>fwrite
|
|
<item>...
|
|
</itemize>
|
|
|
|
|
|
|
|
<sect>Other hints<p>
|
|
|
|
|
|
|
|
<sect>License<p>
|
|
|
|
This software is provided 'as-is', without any expressed or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
<enum>
|
|
<item> The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
<item> Altered source versions must be plainly marked as such, and must not
|
|
be misrepresented as being the original software.
|
|
<item> This notice may not be removed or altered from any source
|
|
distribution.
|
|
</enum>
|
|
|
|
</article>
|