<tag><tt/a2.lc.emd/</tag>
Gives access to 12KB RAM (48 pages of 256 bytes each) on the
- Apple ][ language card. The driver was contributed by
- Stefan Haubenthal. Note that this driver is incompatible with any DOS using
- the language card memory!
+ Apple2 language card. The driver was contributed by Stefan Haubenthal.
+ Note that this driver is incompatible with any DOS using the language
+ card memory!
</descrip><p>
<descrip>
<tag><tt/a2.ssc.ser/</tag>
- Driver for the Apple ][ Super Serial Card. Supports up to
- 19200 baud, hardware flow control (RTS/CTS) and interrupt driven receives.
- Note that because of the peculiarities of the 6551 chip transmits are not
- interrupt driven, and the transceiver blocks if the receiver asserts flow
- control because of a full buffer.
+ Driver for the Apple2 Super Serial Card. Supports up to 19200 baud,
+ hardware flow control (RTS/CTS) and interrupt driven receives. Note
+ that because of the peculiarities of the 6551 chip transmits are not
+ interrupt driven, and the transceiver blocks if the receiver asserts
+ flow control because of a full buffer.
</descrip><p>
</enum>
-<sect1>Function keys<p>
-
-These are defined to be OpenApple + number key.
-
-
<sect1>Interrupts<p>
The runtime for the Apple ][ uses routines marked as <tt/.CONDES/
--- /dev/null
+<!doctype linuxdoc system>
+
+<article>
+
+<title>enhanced Apple //e specific information for cc65
+<author>Ullrich von Bassewitz, <htmlurl url="mailto:uz@cc65.org" name="uz@cc65.org">
+<date>2003-12-16
+
+<abstract>
+An overview over the enhanced Apple //e 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 enhanced Apple //e runtime system
+as it comes with the cc65 C compiler. It describes the memory layout,
+enhanced Apple //e specific header files, available drivers, and any
+pitfalls specific to that platform.
+
+Please note that enhanced Apple //e 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
+enhanced Apple //e target is a machine language program with a 4 byte DOS
+3.3 header. The standard load address is $800.
+
+The DOS header is in its own segment named <tt/EXEHDR/. If you don't want the
+header for some reason, you can change
+
+<verb>
+ HEADER: start = $0000, size = $4, file = %O;
+</verb>
+
+to
+
+<verb>
+ HEADER: start = $0000, size = $4, file = "";
+</verb>
+
+in the linker configuration to have the linker remove it.
+
+Please note that there is a "Apple ][ ProDOS 8 system program
+for loading binary programs" available in the cc65 User Contributions section.
+It adds all benefits of a ProDOS 8 system program to the standard binary
+program generated by the linker for the enhanced Apple //e target.
+
+
+
+<sect>Memory layout<p>
+
+In the standard setup, cc65 generated programs use the memory from
+$800 to $95FF, so 35.5K of memory are available. ROM calls are
+possible without further precautions.
+
+Special locations:
+
+<descrip>
+ <tag/Stack/
+ The C runtime stack is located at HIMEM and grows downwards, regardless of
+ how your linker config file is setup.
+
+ <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 enhanced Apple //e specific code may use the
+<tt/apple2enh.h/ header file.
+
+
+<sect1>enhanced Apple //e specific functions<p>
+
+The functions listed below are special for the enhanced Apple //e. See
+the <htmlurl url="funcref.html" name="function reference"> for declaration and
+usage.
+
+<itemize>
+<item>_dos_type
+<item>_textframe
+<item>_textframexy
+<item>get_ostype
+</itemize>
+
+
+<sect1>Hardware access<p>
+
+There's currently no support for direct hardware access. This does not mean
+you cannot do it, it just means that there's no help.
+
+
+
+<sect>Loadable drivers<p>
+
+
+<sect1>Graphics drivers<p>
+
+<descrip>
+
+ <tag><tt/a2e.lo.tgi/</tag>
+ This driver was written by Stefan Haubenthal. It features a resolution of
+ 40×40 with 16 colors. At the bottom of the screen, 4 additional text
+ lines are available.
+
+ <tag><tt/a2e.hi.tgi/</tag>
+ This driver was written by Stefan Haubenthal. It features a resolution of
+ 280×192 with 6 colors. Note that programs using this driver will have
+ to be linked with <tt/--start-addr $4000/ to reserve the first hires page.
+
+</descrip><p>
+
+
+<sect1>Extended memory drivers<p>
+
+<descrip>
+
+ <tag><tt/a2e.lc.emd/</tag>
+ Gives access to 12KB RAM (48 pages of 256 bytes each) on the
+ Apple2 language card. The driver was contributed by Stefan Haubenthal.
+ Note that this driver is incompatible with any DOS using the language
+ card memory!
+
+</descrip><p>
+
+
+<sect1>Joystick drivers<p>
+
+<descrip>
+
+ <tag><tt/a2e.stdjoy.joy/</tag>
+ Supports up to two standard analog joysticks connected to the game port of
+ the enhanced Apple //e.
+
+</descrip><p>
+
+
+<sect1>Mouse drivers<p>
+
+Currently no drivers available (in fact, the API for loadable mouse drivers
+does not exist).
+
+
+<sect1>RS232 device drivers<p>
+
+<descrip>
+
+ <tag><tt/a2e.ssc.ser/</tag>
+ Driver for the Apple2 Super Serial Card. Supports up to 19200 baud,
+ hardware flow control (RTS/CTS) and interrupt driven receives. Note
+ that because of the peculiarities of the 6551 chip transmits are not
+ interrupt driven, and the transceiver blocks if the receiver asserts
+ flow control because of a full buffer.
+
+</descrip><p>
+
+
+
+<sect>Limitations<p>
+
+
+
+<sect>Other hints<p>
+
+
+<sect1>Passing arguments to the program<p>
+
+Command line arguments can be passed to <tt/main()/ after BLOAD. Since this is not
+supported by BASIC, the following syntax was chosen:
+
+<tscreen><verb>
+]CALL2048: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>Function keys<p>
+
+These are defined to be OpenApple + number key.
+
+
+<sect1>Interrupts<p>
+
+The runtime for the enhanced Apple //e uses routines marked as <tt/.CONDES/
+type 2 for ProDOS 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">).
+
+
+
+<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>
projects / cc65 / commitdiff