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4 <title>VTech Creativision (aka Funvision) specific information for cc65
5 <author><url url="mailto:polluks+cc65@sdf.lonestar.org" name="Stefan A. Haubenthal">
8 An overview over the Creativision runtime system as it is implemented for the
12 <!-- Table of contents -->
15 <!-- Begin the document -->
19 This file contains an overview of the Creativision runtime system as it comes
20 with the cc65 C compiler. It describes the memory layout, Creativision specific header
21 files, available drivers, and any pitfalls specific to that platform.
23 Please note that Creativision specific functions are just mentioned here, they are
24 described in detail in the separate <url url="funcref.html" name="function
25 reference">. Even functions marked as "platform dependent" may be available on
26 more than one platform. Please see the function reference for more information.
29 <sect>Binary format<p>
31 The standard binary output format generated by the linker for the Creativision target
32 is a 4 KB ROM image. To create an 8 KB ROM a custom linker script has
35 <sect>Memory layout<p>
37 cc65 generated programs with the default setup are 4 KB in size,
38 occupying $B000 - $BFFF. Usable memory space for the
39 user program is $B000 - $BEFF. $BF00 -
40 $BFFF is reserved for the runtime and cartridge configuration
47 The text screen is located at VRAM $1000.
50 The C runtime stack is located at $03FF and growing downwards.
53 The available RAM for cc65 programs of an unexpanded Creativision
54 starts at $01FA and ends at $03FF.
57 The C heap is located at the end of the program's data area and
58 grows towards the C runtime stack.
64 <sect>Platform specific header files<p>
66 Programs containing Creativision specific code may use the <tt/creativision.h/ header file.
69 <sect1>Creativision specific functions<p>
80 <!--<sect1>Hardware access<p>
82 The following pseudo variables declared in the <tt/creativision.inc/ include file do
83 allow access to hardware located in the address space.
88 The <tt/VDP/ defines allow access to the video chip.
95 The <tt/PIA/ defines allow access to the I/O chip.
101 <sect>Loadable drivers<p>
103 <sect1>Graphics drivers<p>
105 No graphics drivers are currently available for the Creativision.
108 <sect1>Extended memory drivers<p>
110 No extended memory drivers are currently available for the Creativision.
113 <sect1>Joystick drivers<p>
117 <tag><tt/creativision-stdjoy.joy (creativisionstd_joy)/</tag>
118 A joystick driver for the standard joystick is available.
122 <sect1>Mouse drivers<p>
124 No mouse drivers are currently available for the Creativision.
127 <sect1>RS232 device drivers<p>
129 No communication port drivers are currently available for the Creativision.
137 The existing library for the Creativision doesn't implement C file
138 I/O. There are even no hacks for the <tt/read()/ and <tt/write()/ routines.
140 To be more concrete, this limitation means that you cannot use any of the
141 following functions (and a few others):
162 This software is provided 'as-is', without any expressed or implied
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174 appreciated but is not required.
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