<!doctype linuxdoc system>
<article>
-
-<title>Commodore VIC20 (aka VC20) 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>2004-09-13
+<title>Commodore VIC20 (aka VC20 aka VIC1001) 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 VIC20 runtime system as it is implemented for the cc65 C
<sect>Overview<p>
This file contains an overview of the VIC20 runtime system as it comes with the
-cc65 C compiler. It describes the memory layout, VIC20 specific header files,
+cc65 C compiler. It describes the memory layout, VIC20-specific header files,
available drivers, and any pitfalls specific to that platform.
-Please note that VIC20 specific functions are just mentioned here, they are
-described in detail in the separate <htmlurl url="funcref.html" name="function
+Please note that VIC20-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>Platform
specific header files<p>
+<sect>Platform
-specific header files<p>
-Programs containing VIC20 specific code may use the <tt/vic20.h/ or <tt/cbm.h/
+Programs containing VIC20-specific code may use the <tt/vic20.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/vic20.h/ and declares several functions
common to all CBM platforms.
-<sect1>VIC20
specific functions<p>
+<sect1>VIC20
-specific functions<p>
There are currently no special VIC20 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>
<item>cbm_k_basin
<item>cbm_k_bsout
<item>cbm_k_clrch
+<item>cbm_k_tksa
+<item>cbm_k_second
<item>cbm_load
<item>cbm_open
<item>cbm_opendir
<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 VIC20.
<sect1>Extended memory drivers<p>
-No extended memory drivers are currently available for the VIC20.
+<descrip>
+
+ <tag><tt/vic20-rama.emd (vic20_rama_emd)/</tag>
+ A driver for any RAM at $A000-$BFFF. Supports 32 256 byte pages.
+ Written and contributed by Marco van den Heuvel.
+
+ <tag><tt/vic20-georam.emd (vic20_georam_emd)/</tag>
+ A driver for the Berkeley Softworks GeoRam cartridge connected by means of
+ the MasC=erade c64 cartridge adapter. The driver will determine the
+ available RAM from the connected cartridge. It supports 64KB
+ up to 2048KB of RAM.
+
+</descrip><p>
<sect1>Joystick drivers<p>
+The default drivers, <tt/joy_stddrv (joy_static_stddrv)/, point to <tt/vic20-stdjoy.joy (vic20_stdjoy_joy)/.
+
<descrip>
- <tag><tt/vic20-stdjoy.joy/</tag>
+ <tag><tt/vic20-stdjoy.joy (vic20_stdjoy_joy)/</tag>
Supports one standard joystick connected to the joysticks port of the VIC20.
- <tag><tt/vic20-ptvjoy.joy/</tag>
+ <tag><tt/vic20-ptvjoy.joy (vic20_ptvjoy_joy)/</tag>
Driver for the Protovision 4-player adapter contributed by Groepaz. See
- <htmlurl url="http://www.protovision-online.de/hardw/hardwstart.htm"
- name="http://www.protovision-online.de/hardw/hardwstart.htm"> for prices and
- building instructions. Up to three joysticks are supported.
+ <url url="https://www.protovision.games/hardw/4_player.php"
+ name="the Protovision shop"> for prices and building instructions. Up to three
+ joysticks are supported.
</descrip><p>
-
<sect1>Mouse drivers<p>
No mouse drivers are currently available for the VIC20.
<sect>Limitations<p>
+<sect1>Escape code<p>
+
+The CTRL key cannot be used to type most control characters,
+entering an Esc is not possible.
+
+
<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>
<sect1>Using extended memory<p>
-The extended memory at $A000 may be added to the heap by using the following
-code:
+BLK5 memory may be added to the heap by using the following code:
<tscreen><verb>
/* Check for the existence of RAM */
- if (PEEK(0xA000) == POKE(0xA000, PEEK(0xA000)+1)) {<br>
+ if (PEEK(0xA000) == POKE(0xA000, PEEK(0xA000)+1)) {
/* Add it to the heap */
_heapadd ((void *) 0xA000, 0x2000);
}
<sect1>Interrupts<p>
-The runtime for the VIC20 uses routines marked as <tt/.CONDES/ type 2 for
+The runtime for the VIC20 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 <htmlurl url="ca65.html" name="assembler manual">.
-
-
-
-<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">).
+feature in the <url url="ca65.html" name="assembler manual">.
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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-
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projects / cc65 / blobdiff