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 KB ROM image. To create an 8 KB ROM a custom linker script has
37 <sect>Memory layout<p>
39 cc65 generated programs with the default setup are 4 KB in size,
40 occupying $B000 - $BFFF. Usable memory space for the
41 user program is $B000 - $BEFF. $BF00 -
42 $BFFF is reserved for the runtime and cartridge configuration
49 The text screen is located at VRAM $1000.
52 The C runtime stack is located at $03FF and growing downwards.
55 The available RAM for cc65 programs of an unexpanded Creativision
56 starts at $01FA and ends at $03FF.
59 The C heap is located at the end of the program's data area and
60 grows towards the C runtime stack.
66 <sect>Platform specific header files<p>
68 Programs containing Creativision specific code may use the <tt/creativision.h/ header file.
71 <sect1>Creativision specific functions<p>
82 <!--<sect1>Hardware access<p>
84 The following pseudo variables declared in the <tt/creativision.inc/ include file do
85 allow access to hardware located in the address space.
90 The <tt/VDP/ defines allow access to the video chip.
97 The <tt/PIA/ defines allow access to the I/O chip.
103 <sect>Loadable drivers<p>
105 <sect1>Graphics drivers<p>
107 No graphics drivers are currently available for the Creativision.
110 <sect1>Extended memory drivers<p>
112 No extended memory drivers are currently available for the Creativision.
115 <sect1>Joystick drivers<p>
119 <tag><tt/creativision-stdjoy.joy (creativisionstd_joy)/</tag>
120 A joystick driver for the standard joystick is available.
124 <sect1>Mouse drivers<p>
126 No mouse drivers are currently available for the Creativision.
129 <sect1>RS232 device drivers<p>
131 No communication port drivers are currently available for the Creativision.
139 The existing library for the Creativision doesn't implement C file
140 I/O. There are even no hacks for the <tt/read()/ and <tt/write()/ routines.
142 To be more concrete, this limitation means that you cannot use any of the
143 following functions (and a few others):
164 This software is provided 'as-is', without any expressed or implied
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169 including commercial applications, and to alter it and redistribute it
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173 <item> The origin of this software must not be misrepresented; you must not
174 claim that you wrote the original software. If you use this software
175 in a product, an acknowledgment in the product documentation would be
176 appreciated but is not required.
177 <item> Altered source versions must be plainly marked as such, and must not
178 be misrepresented as being the original software.
179 <item> This notice may not be removed or altered from any source