[ATARI] Altirra 2.0 test XXX

Version 2.00 test 30:

• features added
  • Disk: Fixed a couple of bugs with DCM disk image decoding.

Version 2.00 test 29:

• features added
  • Debugger: Added dump double words (dd) command.

Version 2.00 test 28

When a POKEY timer was active for more than two billion cycles before the IRQ was activated. Two billion cycles is a lot. Problem is, the Atari executes about 1.8 million cycles per second, so that happens in under 20 minutes. At 1500% turbo that's less than two minutes. Ordinarily I'm pretty careful about writing code that handles timestamp wraparound, but I missed the case where a timer is running deferred for longer than that. Now the emulator checks if a timer is more than two seconds old and kicks it forward to avoid the problem.

Version 2.00 test 27:

• features added
  • Debugger: Break on expression command (bx) can now include address ranges.
• bugs fixed
  • Disk: Disk explorer now properly increments volume sequence number when modifying SpartaDOS X images.
  • HLE: Boot loader now sets DBYTLO/DBYTHI to $0400 before launching.
  • SoundBoard: Restricted $D5/D6xx mapping to $D500-D53F and $D600-D63F.

Version 2.00 test 26:

• features added
  • UI: Added MRU list for booted images.
  • GTIA: Optimizations to mode 9 and mode 10 rendering.
  • POKEY: Rewrote sound core to defer repeating events whenever possible for extra speed.

Version 2.00 test 25:

• features added
  • SoundBoard: Multiplier support

Version 2.00 test 24:

• bugs fixed
  • Disk: Fixed H: device not handling zero-byte get/puts properly with burst I/O enabled (affected GET/PUT from BASIC).
  • Disk: H: device now supports OPEN with AUX1=7 to fix directory listing from DOS 2.5.

Version 2.00 test 23:

• bugs fixed
  • UI: Disk sector display was incorrect for accelerated writes.

Version 2.00 test 22:

• ????

Version 2.00 test 21:

• bugs fixed
  • HLE: Screen setup now matches the display list and playfield addressing of the stock OS ROM.
    
  • HLE: Fixed cartridge handling so that cartridges are run after disk boot completes.
    
  • HLE: Added known RTS instruction at $E4C0.
    
  • HLE: CIO now allows SPECIAL commands to be issued on a closed IOCB. 

It also contains a fix for not being able to format double-sided disks, which I didn't add into the changelog because there was already an entry for fixing PERCOM block problems.

Version 2.00 test 20:

• features added
  • Disk: Disk explorer now properly increments volume sequence number when modifying SpartaDOS X images.
  • Disk: Live disk images can now be explored directly from the disk drive entry rather than requiring an unmount and remount.
  • Disk:  Disk explorer shows timestamps.
  • Disk: .ARC compressed archives can now be explored.