Howard M. Harte 0eb14db0a7 AltairZ80: wd179x: Improve accuracy of the simulation. ...

* Properly handle the case when a disk is not attached.
    * Add register access for debugging.
    * Assert DRQ as well as IRQ for software that checks DRQ.
    * Add API to get the number of heads for the currently-selected
      disk.
    * Follow SIMH conventions for debug logging.
    * Add ability to debug IMD from the wd179x debug settings.

Tests:
    * Format and disk access on Cromemco CP/M 2.2, CDOS, 86-DOS,
      MS-DOS 1.25, OASIS 5.6.

2020-12-13 15:41:08 -08:00

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