PC: DOSBox-X v0.83.1 (2020-05-02)

DOSBox-X is a fork of DOSBox. It has a focus on accurate emulation of the hardware and many more ways to tweak and configure the DOS virtual machine. You can download it here.

Quote:
0.83.1

• Sound Blaster emulation fixed to better handle Goldplay
  mode detection false positive in 1994 demoscene demo
  myth_dw.zip when using Sound Blaster Pro setting in
  the demo. The initial state before music starts is
  like Goldplay mode, but when music actually starts the
  DMA programmed to normal state without restarting
  DMA playback.
• dosbox-x.conf is now recognized as the default config
  file name in addition to dosbox.conf. The sample config
  file "dosbox.reference.conf" has been renamed to
  "dosbox-x.reference.conf" as well (Wengier)
• Tandy DAC output fixed to slowly ramp last sample to
  zero DC sample (128) when switched off. This fixes
  loud popping (DC offset) problems with Tandy DAC
  sound effects in Prince of Persia. This new behavior
  also seems to match real Tandy 1000 hardware according
  to video captures of it's audio/video outputs while
  playing Prince of Persia on it.
• Tandy/PCjr 3-voice fixed to respond to I/O port 0xC0
  regardless of 8-bit or 16-bit I/O (fixes Prince of
  Persia).
• Write-protecting a disk image in IMGMOUNT and BOOT
  commands now supported by putting a leading colon (https://www.aep-emu.de/modules/PNphp...icon_smile.gif
  before the image file name. Works with disk swapping;
  e.g. "BOOT :C:DISK1.IMG C:DISK2.IMG" only write-
  protects C:DISK1.IMG but not C:DISK2.IMG. The new
  config option "leading colon write protect image" can
  be used to disable or enable this behavior (Wengier)
• Support for changing DOSBox-X internal time (Wengier)
• Support for pipes (|), e.g. "DIR | MORE" should now
  work as expected; it is recommended to set the %TEMP%
  (or %TMP%) environment variable to a writable directory
  inside DOSBox-X before using pipes (Wengier)
• Improved redirections using "<" or ">" (Wengier)
• Improved Ctrl+C handling in some commands (Wengier)
• Improved Tab completion in the command shell (Wengier)
• Improved -get & -set options for the CONFIG command,
  e.g. support for config options with spaces (Wengier)
• Improved REN (or RENAME) command to support wildcards
  (* and ?) in the source and/or target files (Wengier)
• Some improvements to commands like MORE & VER (Wengier)
• Added BREAK, VERIFY and TRUENAME commands as in a real
  DOS system. Type "[command] /?" for help info (Wengier)
• Implemented FOR command to run a specified command for
  each file in a set of files. Also added LFNFOR command
  to control whether to use long filenames in the FOR
  command as in MS-DOS 7+ (Wengier)
• Implemented ATTRIB command to view and set attributes
  of files or directories (Wengier)
• Added emulation of R (readonly) attribute bit for
  Linux and Unix systems through the user-writable
  file mode bits of the filesystem.
• Fixed PC DOS 2000 crash during installation.
• PC speaker: Mode 3 (square wave) and a counter value
  of 1 produces a low frequency square wave. Ulrasonic
  frequencies do not begin until count == 2. This fixes
  helicopter noises in Paratrooper.
• Fixed PC speaker emulation to allow higher PC speaker
  frequencies (10x the value of pcrate) to reduce
  hiss/noise/aliasing noise that occurs when games
  program ultrasonic frequencies into the counter to
  "silence" the speaker. "Titus the Fox Marrakech and
  Back" should no longer have audible hissing noises
  between beeps when the game is using the PC speaker.
• Increased DOS device limit, to avoid E_Exit() crash
  if all LPT and COM devices are enabled along with
  the new CLIP$ device.
• Minimum MCB free default changed to better reflect
  a typical MS-DOS setup with minimal to no drivers.
  This should result in a report of 600K-ish memory
  free, which is equivalent to Windows 95 without
  anything loaded except COMMAND.COM.
• DIR command now supports /S (search all directories)
  as well as /A, /AS, /A-S, /AH, /A-H, /AR, /A-R, /AA,
  /A-A options for file attribute support; Note that
  DIR /A shows all files and directories whereas DIR
  alone (without /A) shows all except system/hidden
  ones as in a real DOS system (Wengier)
• DIR command now shows the real free disk space on
  local drives. It is possible to limit this free space
  for certain programs with the -freesize option of
  MOUNT command. A new config option "freesizecap" is
  added to change the behavior of this option (Wengier)
• DIR command fixed to show the volume label of the
  drive you are listing, instead of always the current
  drive (rderooy)
• Various improvements to DEL and COPY commands, e.g.
  fixed the DEL /P option having no effect, and "DEL ."
  deleted all files in the current directory silently;
  the COPY command now asks for confirmation before
  overwriting files, and it now supports /Y and /-Y
  options to change this behavior, which can also be
  set from the COPYCMD environment variable. (Wengier)
• Added or fixed help information and/or error messages
  for some commands. (Wengier)
• Added support for DOS programs to communicate
  with the clipboard in Windows builds. If the
  "dos clipboard device enable" setting in
  dosbox-x.conf is set to "true" or "full", a DOS
  device (default name: CLIP$) will be added to
  allow bidirectional communications with the
  clipboard (e.g. "DIR >CLIP$" will write the
  output to the clipboard, and "TYPE CLIP$" will
  show the clipboard contents). Alternatively,
  you can set it to "read" or "write" to allow
  only read or write access for security reasons.
  The DOS device name can also be changed with
  the "dos clipboard device name" setting in
  dosbox-x.conf. (Wengier)
• Added support for using the right mouse button
  to copy and paste from the Windows clipboard; the
  config option "clip_key_modifier" can be used to
  change the keyboard modifier such as none, alt, ctrl,
  shift, or disable this feature (default). (Wengier)
• Updated the PasteClipboard feature in SDL1 build
  to support Unicode text translations; also fixed this
  feature not working in SDL2 build. The config option
  "clip_paste_speed" is added to speed up or slow down
  the pasting speed for different DOS programs (Wengier)
• Support for DOSLIB2's w95sysrg/w95sysrs utils to
  get/set system registry location in DOS 7+. (Wengier)
• Long filename support added, adapted from
  the vDosPlus project. It will be enabled with
  an initial DOS version of 7.0 or higher. (Wengier)
• Corrected return value when using option to
  fake the installation of SHARE. (Allofich)
• Added code to EMS emulation to print specific
  debug information when a PC-98 specific call is
  made to remap segment B000h to either system
  memory or video memory. I do not have enough
  test cases or a setup to test what really happens,
  so it will remain a debug message for now.
• Added dosbox-x.conf option to allow emulation of a
  DOS environment that lacks ANSI.SYS. NOTE: The
  option has no effect in PC-98 mode.
• INT 2Fh now responds to AX=1A00h which is an installation
  check to report whether ANSI.SYS is resident.
• Added INT 21h debug logging for file I/O and general
  INT 21h usage [patch by ognjenmi]. Added enables for
  the logging which are off by default since the INT 21h
  and file I/O logging are fairly noisy under normal
  usage.

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