[ATARI] Altirra 2.0 test XXVI

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.