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>
76 <!--<sect1>Hardware access<p>
78 The following pseudo variables declared in the <tt/creativision.inc/ include file do
79 allow access to hardware located in the address space.
84 The <tt/VDP/ defines allow access to the video chip.
91 The <tt/PIA/ defines allow access to the I/O chip.
97 <sect>Loadable drivers<p>
99 <sect1>Graphics drivers<p>
101 No graphics drivers are currently available for the Creativision.
104 <sect1>Extended memory drivers<p>
106 No extended memory drivers are currently available for the Creativision.
109 <sect1>Joystick drivers<p>
113 <tag><tt/creativision-stdjoy.joy (creativisionstd_joy)/</tag>
114 A joystick driver for the standard joystick is available.
118 <sect1>Mouse drivers<p>
120 No mouse drivers are currently available for the Creativision.
123 <sect1>RS232 device drivers<p>
125 No communication port drivers are currently available for the Creativision.
133 The existing library for the Creativision doesn't implement C file
134 I/O. There are even no hacks for the <tt/read()/ and <tt/write()/ routines.
136 To be more concrete, this limitation means that you cannot use any of the
137 following functions (and a few others):
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