Re: [cc65] scratch files on C64 or file spec and drive numbers

On Tue, Sep 23, 2008 at 04:59:01PM +0200, Dirk Jagdmann wrote:
> I'm failing to delete/remove/scratch files on C64 with a drive/device !=
> 8. I know that the remove() function is supposed to accept a file spec à
> la "drivenum:filename,this,that", but from reading the fnparse assembler
> function I assume the drivenum can only be "0" or "1". Is that true, or
> didn't I interpret the fnparse sources correctly?

Yes, that is true. The drive number is really a drive number, not the device
address on the IEC bus. It is used to distinguish the drives of a dual disk
drive like the 4040.

> If it is true, are the
> various CBM routines supposed to support devices like 8, 11, 21?

Yes. Just assign the drive unit number to _curunit:

        _curunit = 11;
        ...

See cbm.h:
----------------------------------------------------------------------------
/* The file stream implementation and the POSIX I/O functions will use the
 * following variables to determine the file type and the disk unit to use.
 */
extern unsigned char _curunit;          /* Default 8 */
extern unsigned char _filetype;         /* Default 'u' */
----------------------------------------------------------------------------

> Or how can I send arbitrary drive commands to a drive with the C API?

See cbm.h:
----------------------------------------------------------------------------
/* Kernel level functions */
void __fastcall__ cbm_k_setlfs (unsigned char LFN, unsigned char DEV,
                                unsigned char SA);
void __fastcall__ cbm_k_setnam (const char* Name);
[...]
----------------------------------------------------------------------------

Regards


        Uz


-- 
Ullrich von Bassewitz                                  uz@musoftware.de
----------------------------------------------------------------------
To unsubscribe from the list send mail to majordomo@musoftware.de with
the string "unsubscribe cc65" in the body(!) of the mail.