<!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
+<title>Commodore PET-specific information for cc65
+<author>
+<url url="mailto:uz@cc65.org" name="Ullrich von Bassewitz">,<newline>
+<url url="mailto:polluks@sdf.lonestar.org" name="Stefan A. Haubenthal">
<abstract>
An overview over the PET runtime system as it is implemented for the cc65 C
<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,
+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
+Please note that PET-specific functions are just mentioned here, they are
+described in detail in the separate <url 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.
+is a machine language program with a one line BASIC stub, which calls the
+machine language part via SYS. 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>
-<sect>Platform
specific header files<p>
+<sect>Platform
-specific header files<p>
-Programs containing PET specific code may use the <tt/pet.h/ or <tt/cbm.h/
+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>
+<sect1>PET
-specific functions<p>
There are currently no special PET functions.
-<sect1>CBM
specific functions<p>
+<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
+machines. See the <url url="funcref.html" name="function reference"> for
declaration and usage.
<itemize>
<sect>Loadable drivers<p>
+The names in the parentheses denote the symbols to be used for static linking of the drivers.
+
+
<sect1>Graphics drivers<p>
No graphics drivers are currently available for the PET.
<sect1>Joystick drivers<p>
-No joystick drivers are currently available for the PET.
+The default drivers, <tt/joy_stddrv (joy_static_stddrv)/, point to <tt/pet-stdjoy.joy (pet_stdjoy_joy)/.
+
+<descrip>
+
+ <tag><tt/pet-ptvjoy.joy (pet_ptvjoy_joy)/</tag>
+ Driver for the Protovision 4-player adapter contributed by Groepaz. See
+ <url url="http://www.protovision-online.de/hardw/4_player.php?language=en"
+ name="Protovision shop"> for prices and building instructions. Up to two
+ joysticks are supported.
+
+ <tag><tt/pet-stdjoy.joy (pet_stdjoy_joy)/</tag>
+ Driver for the standard PET userport joystick.
+
+</descrip><p>
<sect1>Mouse drivers<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:
+Command-line arguments can be passed to <tt/main()/. Since that is not
+supported directly by BASIC, the following syntax was chosen:
<tscreen><verb>
RUN:REM ARG1 " ARG2 IS QUOTED" ARG3 "" ARG5
<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>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>
<tt/ST/ variable.
+<sect1>Interrupts<p>
+
+The runtime for the PET uses routines marked as <tt/.INTERRUPTOR/ for
+interrupt handlers. Such routines must be written as simple machine language
+subroutines and will be called automatically by the interrupt handler code
+when they are linked into a program. See the discussion of the <tt/.CONDES/
+feature in the <url url="ca65.html" name="assembler manual">.
+
+
<sect1>Using extended memory<p>
The extended memory at $9000 of the CBM 8x96 may be added to the heap by using
</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>
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.
+<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>
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