Drive options precedence

Disk drive emulation has the fallback order

• true drive emulation (TDE)
• disk image emulation
  • file system access, or
  • raw /dev/fd0 device access, or
  • real IEC device access via OpenCBM.

In detail:

1. Drive #. model must not be None. (None = no drive. Stop.)
2. If TDE is enabled, this is used. No image attached = empty drive.

   These options are relevant:

   • Drive sound emulation
   • Drive #. model / * (must not be None)
   • Drive #. options / Read only access
   • Drive #. expansion / *
   • Drive #. 40-track image support / *
   • Drive #. idle method / *

   Note that if TDE is enabled, and you want to use disk files, then Enable Virtual devices should be disabled, otherwise there are buggy side-effects (see Bug #580). Unfortunately, to use a printer, this option should be enabled...

   Otherwise (if no TDE)...

3. Enable Virtual devices must be enabled (otherwise there is no drive. Stop.).
4. If a disk image is attached to the drive, this disk image is used, regardless of the selection in Drive #. device type.

   These options are relevant:

   • Drive #. options / Read only access
   • Drive #. 40-track image support / *

   and this action:

   • Attach disk image / Unit #....

   Otherwise...

5. Drive #. device type = None -> no drive. Stop.

   Otherwise... (no disk image is attached)

6. Drive #. device type = File system access -> directory is accessed

   sets resource FileSystemDevice8 to ATTACH_DEVICE_FS

   These options are relevant:

   • Drive #. options / Read only access
   • Drive #. options / File system directory...
   • Drive #. options / Convert P00 file names
   • Drive #. options / Create P00 files on save
   • Drive #. options / Hide non-P00 files

   Otherwise...

7. Drive #. device type = Raw device access -> use a real host OS floppy drive

   sets resource FileSystemDevice8 to ATTACH_DEVICE_RAW

   These options are relevant:

   • RAW block device name...

   Otherwise...

8. Drive #. device type = Real device access -> access device via OpenCBM

   sets resource FileSystemDevice8 to ATTACH_DEVICE_REAL

   These options are relevant:

   • Drive #. options / Enable IEC device

     It sets resource IECDevice8

   Having these 2 things for IEC devices seems unneeded?

   What happens if one of the options is selected but not the other?