4. Platform specific header files

Programs containing CBM 610 specific code may use the cbm610.h or cbm.h header files. Using the later may be an option when writing code for more than one CBM platform, since it includes cbm610.h and declares several functions common to all CBM platforms.

4.1 CBM 610 specific functions

The functions listed below are special for the CBM 610. See the function reference for declaration and usage.

• peekbsys
• peekwsys
• pokebsys
• pokewsys

4.2 CBM specific functions

Some functions are available for all (or at least most) of the Commodore machines. See the function reference for declaration and usage.

• cbm_close
• cbm_closedir
• cbm_k_setlfs
• cbm_k_setnam
• cbm_k_load
• cbm_k_save
• cbm_k_open
• cbm_k_close
• cbm_k_readst
• cbm_k_chkin
• cbm_k_ckout
• cbm_k_basin
• cbm_k_bsout
• cbm_k_clrch
• cbm_load
• cbm_open
• cbm_opendir
• cbm_read
• cbm_readdir
• cbm_save
• cbm_write
• get_tv

4.3 Hardware access

The following pseudo variables declared in the cbm610.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.

Note: All I/O chips are located in the system bank (bank 15) and can therefore not be accessed like on other platforms. Please use one of the peekbsys, peekwsys, pokebsys and pokewsys functions to access the I/O chips. Direct reads and writes to the structures named below will not work!

CRTC

The CRTC structure allows access to the CRTC (the video controller). See the _6545.h header file located in the include directory for the declaration of the structure.

SID

The 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.

ACIA

Access to the ACIA (the RS232 chip) is available via the ACIA variable. See the _6551.h header file located in the include directory for the declaration of the structure.

CIA

Access to the CIA chip is available via the CIA variable. See the _6526.h header file located in the include directory for the declaration of the structure.

TPI1, TPI2

The two 6525 triport chips may be accessed by using this variable. See the _6525.h header file located in the include directory for the declaration of the structure.