1 <!doctype linuxdoc system>
5 <title>VTech Creativision (aka Funvision) specific information for cc65
6 <author><url url="mailto:polluks+cc65@sdf.lonestar.org" name="Stefan A. Haubenthal">
10 An overview over the Creativision runtime system as it is implemented for the
14 <!-- Table of contents -->
17 <!-- Begin the document -->
21 This file contains an overview of the Creativision runtime system as it comes
22 with the cc65 C compiler. It describes the memory layout, Creativision specific header
23 files, available drivers, and any pitfalls specific to that platform.
25 Please note that Creativision specific functions are just mentioned here, they are
26 described in detail in the separate <url url="funcref.html" name="function
27 reference">. Even functions marked as "platform dependent" may be available on
28 more than one platform. Please see the function reference for more information.
31 <sect>Binary format<p>
33 The standard binary output format generated by the linker for the Creativision target
34 is a 4 kbyte machine language program. It is of course possible to change
35 this behaviour by using one of the different linker configs.
37 <sect>Memory layout<p>
39 cc65 generated programs with the default setup run with the I/O area enabled,
40 which gives a usable memory range of $B000 - $BEFF.
41 More ROM may need additional bankswitching code.
47 The text screen is located at VRAM $1000.
50 The C runtime stack is located at $3FF and growing downwards.
53 The C heap is located at the end of the program and grows towards the C
60 <sect>Platform specific header files<p>
62 Programs containing Creativision specific code may use the <tt/creativision.h/ header file.
65 <sect1>Creativision specific functions<p>
77 <!--<sect1>Hardware access<p>
79 The following pseudo variables declared in the <tt/creativision.inc/ include file do
80 allow access to hardware located in the address space.
85 The <tt/VDP/ defines allow access to the video chip.
92 The <tt/PIA/ defines allow access to the I/O chip.
98 <sect>Loadable drivers<p>
100 <sect1>Graphics drivers<p>
102 No graphics drivers are currently available for the Creativision.
105 <sect1>Extended memory drivers<p>
107 No extended memory drivers are currently available for the Creativision.
110 <sect1>Joystick drivers<p>
112 No joystick drivers are currently available for the Creativision but <tt/joystate()/.
115 <sect1>Mouse drivers<p>
117 No mouse drivers are currently available for the Creativision.
120 <sect1>RS232 device drivers<p>
122 No communication port drivers are currently available for the Creativision.
130 The existing library for the Creativision doesn't implement C file
131 I/O. There are even no hacks for the <tt/read()/ and <tt/write()/ routines.
133 To be more concrete, this limitation means that you cannot use any of the
134 following functions (and a few others):
155 This software is provided 'as-is', without any expressed or implied
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159 Permission is granted to anyone to use this software for any purpose,
160 including commercial applications, and to alter it and redistribute it
161 freely, subject to the following restrictions:
164 <item> The origin of this software must not be misrepresented; you must not
165 claim that you wrote the original software. If you use this software
166 in a product, an acknowledgment in the product documentation would be
167 appreciated but is not required.
168 <item> Altered source versions must be plainly marked as such, and must not
169 be misrepresented as being the original software.
170 <item> This notice may not be removed or altered from any source