Watara Supervision specific information for cc65

Stefan A. Haubenthal

2017-11-21
An overview over the Supervision runtime system as it is implemented for the cc65 C compiler.

1. Overview

2. Binary format

3. Memory layout

4. Platform specific header files

5. Loadable drivers

6. Limitations

7. Other hints

8. License


1. Overview

This file contains an overview of the Supervision runtime system as it comes with the cc65 C compiler. It describes the memory layout, Supervision specific header files, available drivers, and any pitfalls specific to that platform.

Please note that Supervision specific functions are just mentioned here, they are described in detail in the separate function reference. Even functions marked as "platform dependent" may be available on more than one platform. Please see the function reference for more information.

2. Binary format

The standard binary output format generated by the linker for the Supervision target is a 2×16 kbyte machine language program. It is of course possible to change this behaviour by using one of the different linker configs.

3. Memory layout

cc65 generated programs with the default setup run with the I/O area enabled, which gives a usable memory range of $8000 - $FFF9. More ROM may need additional bankswitching code.

Special locations:

Text screen

No conio support is currently available for the Supervision.

Stack

The C runtime stack is located at $1FFF and growing downwards.

Heap

The C heap is located at the end of the program and grows towards the C runtime stack.

4. Platform specific header files

Programs containing Supervision specific code may use the supervision.h header file.

4.1 Hardware access

The following pseudo variables declared in the supervision.inc include file do allow access to hardware located in the address space.

IO

The IO defines allow access to the IO chip.

5. Loadable drivers

5.1 Graphics drivers

No graphics drivers are currently available for the Supervision.

5.2 Extended memory drivers

No extended memory drivers are currently available for the Supervision.

5.3 Joystick drivers

supervision-stdjoy.joy (supervision_stdjoy_joy)

A joystick driver for the standard two buttons joypad is available.

5.4 Mouse drivers

No mouse drivers are currently available for the Supervision.

5.5 RS232 device drivers

No communication port drivers are currently available for the Supervision.

6. Limitations

6.1 Disk I/O

The existing library for the Supervision doesn't implement C file I/O. There are even no hacks for the read() and write() routines.

To be more concrete, this limitation means that you cannot use any of the following functions (and a few others):

7. Other hints

8. License

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:

  1. 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.
  2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.