Disk II: Changing Config's 'Disk access speed' should not trigger a restart

[tomcw]

Changing "Disk access speed" (Authentic Speed / Enhanced Speed), displays a prompt to restart...

The emulator needs to restart as the hardware configuration has changed:

But changing this parameter is harmless during an emulation session (eg. the same as using Scroll-Lock to switch between normal/full speed).

[tomcw]

Details about enhancedisk flag:

It is saved to the save-state, so it is part of the emulated machine (not merely a configuration).

Authentic:

• On a Disk II latch r/w ($C0EC) when drive's motor is spinning, then simulate disk rotation by advancing track position in units of nibbles (32usec = 32cycles).
• On reading a new track (for .do and .po images only), then SkewTrack() is applied
  • NB. nothing to do with sector skewing, but more like position on new track after stepping head

Enhanced:

• Acts as one of the conditions to enable Full-Speed mode.
  • also need drive motor on and both speaker/Mockingboard to be inactive.