mirror of
https://github.com/cc65/cc65.git
synced 2024-06-01 13:41:34 +00:00
Added PET docs by Stefan Haubenthal
git-svn-id: svn://svn.cc65.org/cc65/trunk@3516 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
parent
8016a18e92
commit
95c7d550e5
|
|
@ -109,6 +109,9 @@ Main documentation page, contains links to other available stuff.
|
|||
<tag><htmlurl url="lynx.html" name="lynx.html"></tag>
|
||||
Topics specific to the Atari Lynx Game Console.
|
||||
|
||||
<tag><htmlurl url="pet.html" name="pet.html"></tag>
|
||||
Topics specific to the Commodore PET machines.
|
||||
|
||||
<tag><htmlurl url="plus4.html" name="plus4.html"></tag>
|
||||
Topics specific to the Commodore Plus/4.
|
||||
|
||||
|
|
|
|||
241
doc/pet.sgml
Normal file
241
doc/pet.sgml
Normal file
|
|
@ -0,0 +1,241 @@
|
|||
<!doctype linuxdoc system>
|
||||
|
||||
<article>
|
||||
|
||||
<title>Commodore PET specific information for cc65
|
||||
<author>Ullrich von Bassewitz, <htmlurl url="mailto:uz@cc65.org" name="uz@cc65.org">
|
||||
Stefan A. Haubenthal, <htmlurl url="mailto:polluks@sdf.lonestar.org" name="polluks@sdf.lonestar.org">
|
||||
<date>2005-05-24
|
||||
|
||||
<abstract>
|
||||
An overview over the PET 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 PET runtime system as it comes with the
|
||||
cc65 C compiler. It describes the memory layout, PET specific header files,
|
||||
available drivers, and any pitfalls specific to that platform.
|
||||
|
||||
Please note that PET specific functions are just mentioned here, they are
|
||||
described in detail in the separate <htmlurl 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 PET target
|
||||
is a machine language program with a one line BASIC stub. This means that a
|
||||
program can be loaded as BASIC program and started with RUN. It is of course
|
||||
possible to change this behaviour by using a modified startup file and linker
|
||||
config.
|
||||
|
||||
|
||||
<sect>Memory layout<p>
|
||||
|
||||
cc65 generated programs with the default setup run with the I/O area and the
|
||||
kernal and BASIC ROM enabled, which gives a usable memory range of
|
||||
$0400 - $7FFF (32KB machine).
|
||||
All ROM entry points may be called directly without additional code.
|
||||
|
||||
Special locations:
|
||||
|
||||
<descrip>
|
||||
<tag/Text screen/
|
||||
The text screen is located at $8000.
|
||||
|
||||
<tag/Stack/
|
||||
The C runtime stack is located at $7FFF and growing downwards.
|
||||
|
||||
<tag/Heap/
|
||||
The C heap is located at the end of the program and grows towards the C
|
||||
runtime stack.
|
||||
|
||||
</descrip><p>
|
||||
|
||||
|
||||
|
||||
<sect>Platform specific header files<p>
|
||||
|
||||
Programs containing PET specific code may use the <tt/pet.h/ or <tt/cbm.h/
|
||||
header files. Using the later may be an option when writing code for more than
|
||||
one CBM platform, since it includes <tt/pet.h/ and declares several functions
|
||||
common to all CBM platforms.
|
||||
|
||||
|
||||
<sect1>PET specific functions<p>
|
||||
|
||||
There are currently no special PET functions.
|
||||
|
||||
|
||||
|
||||
<sect1>CBM specific functions<p>
|
||||
|
||||
Some functions are available for all (or at least most) of the Commodore
|
||||
machines. See the <htmlurl url="funcref.html" name="function reference"> for
|
||||
declaration and usage.
|
||||
|
||||
<itemize>
|
||||
<item>cbm_close
|
||||
<item>cbm_closedir
|
||||
<item>cbm_k_setlfs
|
||||
<item>cbm_k_setnam
|
||||
<item>cbm_k_load
|
||||
<item>cbm_k_save
|
||||
<item>cbm_k_open
|
||||
<item>cbm_k_close
|
||||
<item>cbm_k_readst
|
||||
<item>cbm_k_chkin
|
||||
<item>cbm_k_ckout
|
||||
<item>cbm_k_basin
|
||||
<item>cbm_k_bsout
|
||||
<item>cbm_k_clrch
|
||||
<item>cbm_load
|
||||
<item>cbm_open
|
||||
<item>cbm_opendir
|
||||
<item>cbm_read
|
||||
<item>cbm_readdir
|
||||
<item>cbm_save
|
||||
<item>cbm_write
|
||||
<item>get_tv
|
||||
</itemize>
|
||||
|
||||
|
||||
<sect1>Hardware access<p>
|
||||
|
||||
The following pseudo variables declared in the <tt/pet.h/ header file do allow
|
||||
access to hardware located in the address space. Some variables are
|
||||
structures, accessing the struct fields will access the chip registers.
|
||||
|
||||
<descrip>
|
||||
|
||||
<tag><tt/PIA1, PIA2/</tag>
|
||||
Access to the two PIA (peripheral interface adapter) chips is available via
|
||||
the <tt/PIA1/ and <tt/PIA2/ variables. The structure behind these variables
|
||||
is explained in <tt/_pia.h/.
|
||||
|
||||
<tag><tt/VIA/</tag>
|
||||
The <tt/VIA/ structure allows access to the VIA (versatile interface
|
||||
adapter). See the <tt/_6522.h/ header file located in the include
|
||||
directory for the declaration of the structure.
|
||||
|
||||
</descrip><p>
|
||||
|
||||
|
||||
|
||||
<sect>Loadable drivers<p>
|
||||
|
||||
<sect1>Graphics drivers<p>
|
||||
|
||||
No graphics drivers are currently available for the PET.
|
||||
|
||||
|
||||
<sect1>Extended memory drivers<p>
|
||||
|
||||
No extended memory drivers are currently available for the PET.
|
||||
|
||||
|
||||
<sect1>Joystick drivers<p>
|
||||
|
||||
No joystick drivers are currently available for the PET.
|
||||
|
||||
|
||||
<sect1>Mouse drivers<p>
|
||||
|
||||
No mouse drivers are currently available for the PET.
|
||||
|
||||
|
||||
<sect1>RS232 device drivers<p>
|
||||
|
||||
No serial drivers are currently available for the PET.
|
||||
|
||||
|
||||
|
||||
<sect>Limitations<p>
|
||||
|
||||
|
||||
|
||||
<sect>Other hints<p>
|
||||
|
||||
<sect1>Passing arguments to the program<p>
|
||||
|
||||
Command line arguments can be passed to <tt/main()/. Since this is not
|
||||
supported by BASIC, the following syntax was chosen:
|
||||
|
||||
<tscreen><verb>
|
||||
RUN:REM ARG1 " ARG2 IS QUOTED" ARG3 "" ARG5
|
||||
</verb></tscreen>
|
||||
|
||||
<enum>
|
||||
<item>Arguments are separated by spaces.
|
||||
<item>Arguments may be quoted.
|
||||
<item>Leading and trailing spaces around an argument are ignored. Spaces within
|
||||
a quoted argument are allowed.
|
||||
<item>The first argument passed to <tt/main/ is the program name.
|
||||
<item>A maximum number of 10 arguments (including the program name) are
|
||||
supported.
|
||||
</enum>
|
||||
|
||||
|
||||
<sect1>Program return code<p>
|
||||
|
||||
The program return code (low byte) is passed back to BASIC by use of the
|
||||
<tt/ST/ variable.
|
||||
|
||||
|
||||
<sect1>Using extended memory<p>
|
||||
|
||||
The extended memory at $9000 of the CBM 8x96 may be added to the heap by using
|
||||
the following code:
|
||||
|
||||
<tscreen><verb>
|
||||
/* Check for the existence of RAM */
|
||||
if (PEEK(0x9000) == POKE(0x9000, PEEK(0x9000)+1)) {
|
||||
/* Add it to the heap */
|
||||
_heapadd ((void *) 0x9000, 0x2000);
|
||||
}
|
||||
</verb></tscreen>
|
||||
|
||||
|
||||
<sect>Bugs/Feedback<p>
|
||||
|
||||
If you have problems using the library, if you find any bugs, or if you're
|
||||
doing something interesting with it, I would be glad to hear from you. Feel
|
||||
free to contact me by email (<htmlurl url="mailto:uz@cc65.org"
|
||||
name="uz@cc65.org">).
|
||||
|
||||
|
||||
|
||||
<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>
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user