Programs containing C64 specific code may use the
header files. Using the later may be an option when writing code for more than
one CBM platform, since it includes
c64.h and declares several functions
common to all CBM platforms.
The functions listed below are special for the C64. See the function reference for declaration and usage.
Some functions are available for all (or at least most) of the Commodore machines. See the function reference for declaration and usage.
The following pseudo variables declared in the
c64.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.
VIC structure allows access to the VIC II (the graphics
controller). See the
_vic2.h header file located in the include
directory for the declaration of the structure.
SID structure allows access to the SID (the sound interface
device). See the
_sid.h header file located in the include directory
for the declaration of the structure.
Access to the two CIA (complex interface adapter) chips is available via
CIA2 variables. The structure behind these variables
is explained in
A character array that mirrors the color RAM of the C64 at $D800.