Free 4DOS      Current version of free 4DOS by Luchezar Georgiev, with the following changes:

• Build 200 (Version 8.00) � 27 February 2009:
  * Fixed my v7.51 bug: swapping to hard disk would crash
  * SET {the switch character}{any character}={value string} now works
  * REN /N now returns an error if the target filename already exists
  * Added SETERROR command
  * Added ATTRIB /N option
  * Added @ISLOWER and @ISUPPER functions
  * Added _LASTDIR, _VERMAJOR, _VERMINOR and _VERSION variables
  * Updated help file for the above changes and updated "Keywords" page

• Build 199 (Version 7.99) � 29 December 2008:
  * No _CPUSPEED crash on early 586 if RDTSC not emulated by EMM386
  * _CPUSPEED now returns a much more consistent value under W9x/ME
  * _CPUSPEED now works even if the CPU has no TSC (i.e. 8086-486), and
  * _CPU and _NDP now return much more detailed info if no brand string
     thanks to the CPU/FPU detection library by Vladimir M. Zakharychev
  * Updated help file for the above changes

• Build 198 (Version 7.98) � 19 December 2008:
  * Fixed my 7.92 bug: if the Int 67h vector was 0, _VCPI would crash
  * Mouse functions would no longer crash on old PCs if no mouse driver
  * Added @COM function and _SBDSP internal variable
  * _VIDEO now returns "svga" if a VESA SuperVGA BIOS is present
  * Updated help file for the above changes and updated "Keywords" page

• Build 197 (Version 7.97) � 12 December 2008:
  * _DRIVES and _LASTDISK now return correct results in PTS-DOS
  * 4DOS now honours the NO_SEP environment variable
  * Added _VDS internal variable
  * Updated help file for the above changes and updated "Keywords" page

• Build 196 (Version 7.96) � 1 December 2008:
  * Added REBOOT /M(onitor off) and /S(uspend) options
  * Added @CODEPAGE function and _POWER variable
  * Updated help file for the above changes and updated "Keywords" page

• Build 195 (Version 7.95) � 24 November 2008:
  * Now LIST /X /T"xy zt..." searches for the hex sequence "xy zt..."
  * Added @CLUSTSIZE and @HDDSIZE functions
  * Added _APPEND, _ASSIGN, _DISPLAY, _DRIVER, _EGA, _GRAFTABL,
     _GRAPHICS, _MSCDEX, _PRINT, _SMARTDRV, _TASKMAX and
     _TASKSWITCHER variables
  * Updated help file for the above changes and updated "Keywords" page
  * Slightly edited _4INST.BTM and INTRO.TXT

• Build 194 (Version 7.94) � 18 November 2008:
  * Changed box shadow foreground from low intensity white to dark grey
  * Added @DDCSTR function
  * Added _MACHINE, _NETWORK, _NLSFUNC and _SHARE variables
  * Updated help file for the above changes and updated "Keywords" page

• Build 193 (Version 7.93) � 7 November 2008:
  * Revised and somewhat shortened the INTRO.TXT file (also by Klaus)
  * _4INST.BTM heavily modified; now searched for in the 4DOS directory
  * Jaelani fixed KSTACK 7.9 conditional load (allocation strategy) bug
  * Fixed all warnings but 1, muted OW source warnings, quietened build
  * Updated BATCOMP to version 7.5 which has /E(ncryption) switch added
  * Added _FONTPAGE internal variable
  * Updated help file for the above changes and updated "Keywords" page

• Build 192 (Version 7.92) � 31 October 2008:
  * The installer batch file cleaned up and greatly simplified by Klaus
  * ALIAS, FUNCTION and SET now accept wildcards in display mode
  * Added /U(ninstall) option to KSTACK (plus optimisation) by Jaelani
  * Added @FSTYPE function and _KEYSTACKED and _VCPI variables
  * Updated help file for the above changes, incl. Glossary and Keywords

• Build 191 (Version 7.91) � 27 October 2008:
  * Fixed my v7.86 bug: cursor was lost after running LIST in batch file
  * Added COUNTRY command
  * Updated help file for the above change and updated "Keywords" page

• Build 190 (Version 7.90) � 20 October 2008:
  * Fixed my v7.89 bug: Shift-TAB didn't act as F8 on auto-completion
  * Fixed my v7.89 bug: LIST search highlighted text past right margin
  * _READY now works under DR-DOS for CD-/DVD-drives
  * HELPCFG can now be built from source thanks to Jaelani's EDISCRN.INC
  * Added IDLE command (DR-DOS-only)
  * Updated help file for the above change and updated "Keywords" page

• Build 189 (Version 7.89) � 16 October 2008:
  * Fixed my bug where if no TZ was set, time zone info was garbage
  * TYPE without /L, /P or redirection can now show Mac OS 9 text files
  * LIST hex search result now highlighted across byte 8 & 9 of the row
  * LIST hex search in hex mode highlights no text results & vice-versa

• Build 188 (Version 7.88) � 12 October 2008:
  * Added hex input format for SETDOS /C, /E and /P, @CHAR and @FILEWRITEB (others accept it too but it's unusual for them)
  * Added =X hex output format with a leading 0x for @EVAL
  * Added TRANSIENT command
  * Updated help file for the above changes and updated "Keywords" page

• Build 187 (Version 7.87) � 10 October 2008:
  * Fixed my bug causing DELAY /M and _CPUSPEED sporadic hang-up
  * _WINTICKS now works on 8086-286 too
  * TIMER accuracy now 10 ms on 8086-286 too (but still not under OS/2)
  * TITLEPROMPT now works under OS/2 too
  * Added TITLE command
  * Updated help file for the above changes and updated "Keywords" page

• Build 186 (Version 7.86) � 6 October 2008:
  * Hid LIST cursor
  * Added _DST, _MJD, _STZN, _STZO, _TZN, _TZO, _UNIXTIME, _UTCDATE, _UTCDATETIME, _UTCHOUR, _UTCISODATE, _UTCMINUTE, _UTCSECOND, _UTCTIME
  * Updated help file for the above change and updated "Keywords" page

• Build 185 (Version 7.85) � 26 September 2008:
  * All date options, arguments and date input can be ISO ordinal date
  * _WINTITLE now works also under W9x/ME
  * Added _STARTPATH internal variable
  * Updated help file for the above changes and updated "Keywords" page

• Build 184 (Version 7.84) � 24 September 2008:
  * Added stack size monitoring to batch debugger window title
  * Added ISO ordinal date format 6 to @AGEDATE, @DATECONV, @FILEDATE and @MAKEDATE
  * Added _ISORDATE and _WINTICKS internal variables
  * Added @DIRSTACK and @SIMILAR functions
  * Updated help file for the above changes and corrected DIRS directionBuild 185 (Version 7.85) � 26 September 2008:
  * All date options, arguments and date input can be ISO ordinal date
  * _WINTITLE now works also under W9x/ME
  * Added _STARTPATH internal variable
  * Updated help file for the above changes and updated "Keywords" page

• Build 183 (Version 7.83) � 22 September 2008:
  * Avoid diskette swap prompt for _READY if B: is a "phantom floppy"
  * Added @COMPARE, @LCS and @REVERSE functions
  * Updated help file for the above change

• Build 182 (Version 7.82) � 19 September 2008:
  * Fixed my v7.81 @DATE bug: wrongly used ISO week year to sum days
  * SETDOS /C, /E and /P now accept ASCII code as numeric argument
  * Added PROMPT $A to show ampersand and $K to show ISO week date
  * Added _HDRIVES internal variable
  * Added @CEILING, @DRIVETYPE and @FLOOR functions
  * Updated help file for the above changes

• Build 181 (Version 7.81) � 17 September 2008:
  * Prevented buffer overflow if @INSERT strings too long
  * Made stricter and united all day-of-year/days-since-1980 code
  * DATE/TIME prompt date/time separators made country-specific
  * Added _CDROMS, _DRIVES, _ISOWYEAR and _READY variables and
  * @DATECONV,@HISTORY,@ISOWYEAR,@SUBST,@UNQUOTES fns
  * Updated help file for the above changes

• Build 180 (Version 7.80) � 14 September 2008:
  * INKEY /W no longer loads the CPU in W9x/ME and DesqView
  * Added _ININAME and _TICK variables
  * Added @COUNT,@ISALNUM,@ISALPHA,@ISASCII,@ISCNTRL,@ISDIGIT,@ISPRINT,@ISPUNCT,@ISSPACE and @ISXDIGIT functions
  * Updated help file for the above changes

• Build 179 (Version 7.79) � 11 September 2008:
  * Last LIST search text is now default for new search in same mode
  * Added _BATCHTYPE, _BDEBUGGER, _CMDSPEC and _V86 variables
  * Added @QUOTE and @UNQUOTE functions
  * Updated help file for the above changes

• Build 178 (Version 7.78) � 8 September 2008:
  * Fixed my year increment/decrement bug on ISO week date output
  * The keystroke terminating DELAY /B is no longer shown
  * Non-repeated seed value period increased from 1 month to 1 year
  * Added _TSC and _CPUSPEED variables
  * Added TIMER /Q(uiet) option
  * TIMER accuracy improved from 55 to 10 ms but on 8086-286 or OS/2
  * Accuracy of DELAY /M improved from 55 to 1 ms (32 ms under OS/2)
  * Updated and amended help file for DELAY, TIMER, _TSC, _CPUSPEED

• Build 177 (Version 7.77) � 31 August 2008:
  * All date options, arguments and date input can now be ISO week date
  * Added ISO week date format 5 to @AGEDATE,@FILEDATE,@MAKEDATE
  * Added _ISOWDATE internal variable
  * Updated help file for the above changes

• Build 176 (Version 7.76) � 29 August 2008:
  * Added MOD as an equivalent to the %% operator of @EVAL
  * Added @ISODOWI,@ISOWEEK functions & _ISODOWI,_ISOWEEK vars
  * Updated help file for the above changes

• Build 175 (Version 7.75) � 24 August 2008:
  * GOSUB variables containing the switch character are now accepted
  * Prompt is now on the first, not the second row after screen cleared
  * Added SET /E option (set local environment too if /M also specified)
  * Added @AVERAGE function and _SYSREQ variable
  * Updated help file for the above changes

• Build 174 (Version 7.74) � 12 August 2008:
  * History log no longer contains the line "AUTOEXEC"
  * Added @FILEREADB function
  * If length = �1, @FILEWRITEB input data is series of ASCII values
  * Updated help file for the above changes

• Build 173 (Version 7.73) � 4 August 2008:
  * Correct extended memory size even if > 64M in MEMORY & @EXTENDED
  (NOTE: It's size of all extended memory regardless of XMS managers.)
  * Added @SMBSTR function
  * Updated help file for the above changes

• 4INST Changes on 23 July 2008
  Allowed installation in 4DOS 7.65+ where _DOS is not always "DOS".

• 4HELP Changes on 16 and 21 July 2008
  Maximum number of cross-references per topic set to 512 (was 128).
  As BP7 "Intr" self-modifying code fails in JPC, now TP5.5 can build it too.

• Build 172 (Version 7.72) � 15 July 2008:
  * SETDOS /W now works under MS-DOS/PC DOS 5.0+ and W9x/ME
  * Replaced the @RANDOM LCG with Xorshift7 (period = 2256�1)
  * Added @LTRIM, @RTRIM and @TRUNCATE functions
  * Updated help file for the above changes

• Build 171 (Version 7.71) � 10 July 2008:
  * Fixed a bug in LIST search results highlighting, obvious in hex mode
  * Enabled SETDOS /X[+|-]9 to enable / disable user-defined functions
  * Added _EDITMODE and _EXPANSION variables
  * Updated help file for the above changes

• Build 170 (Version 7.70) � 9 July 2008:
  * Fixed a bug in LIST where bottom line repeats on 1-line scroll down if a higher line ended at the right margin (DOS text files only)
  * Fixed a LIST header percentage display overflow bug for big files
  * Holding Shift with F or Ctrl-F in LIST now matches search case
  * Added a /N (line numbers) option to LIST
  * Updated help file for the above changes

• Build 169 (Version 7.69) � 4 July 2008:
  * Fixed the title of the reverse find (Ctrl-F) window in LIST
  * Added @SHA1 function and _STDIN, _STDOUT and _STDERR variables
  * Updated help file for the above change

• Build 168 (Version 7.68) � 1 July 2008:
  * _CPU now set to processor brand string if supported by the CPU
  * REBOOT /P now works in W9x/ME even if PM APM interface engaged
  * Update help file for the above changes, added a W9x/ME warning

• Build 167 (Version 7.67) � 29 June 2008:
  * TYPE without /L, /P or redirection now shows UNIX text files right
  * REBOOT now works under OS/2, Windows 9x/ME and QEMM Stealth ROM
  * Added _EXECSTR internal variable
  * Updated help file for the above changes

• Build 166 (Version 7.66) � 23 June 2008:
  * Warm REBOOT now honours EMM's Int 19h "hook" or jumps to F000:E05B
  * SHIFT switch character no longer hard-coded to '/'
  * _DOS now available also with 4DOS /C

• Build 165 (Version 7.65) � 11 June 2008:
  * The Shell sort of directories replaced with the much faster heapsort
  * Internal variable _DOS now reflects actual running operating system
  * Added _LALT, _LCTRL, _RALT, _RCTRL internal variables
  * Updated help file for the above changes

• 4HELP Changes on 31 May 2008
  In VESA text video-modes with over 80 columns, BP7 no longer resets the video-mode on start or blanks the screen on exit (invoked by F1).

• Build 164 (Version 7.64) � 26 May 2008:
  * If the string has a leading separator, the word or field index is negative and its absolute value is equal to the number of words (fields), @WORD and @FIELD no longer return the whole string
  * @WORD[S], @FIELD[S] no longer ignore leading space(s) in string
  * TOUCH /R or /T now set file seconds properly without halving them
  * LIST now shows also seconds and 4-digit year in its file info box
  * Added EQC (case-sensitive) comparison operator
  * Updated help file for the above change

• Build 163 (Version 7.63) � 3 May 2008:
  * If EditMode is not Init*, cursor shape is now reset on hitting Enter
  * "Warm" REBOOT in DOS now also pulses RESET pin on ATs (still "warm")
  * If InstallPath is not set, OPTION can now invoke 4HELP

• Build 162 (Version 7.62) � 25 April 2008:
  * The prompt after a CLS now goes to the first, not the second line
  * As in COMMAND.COM, /K now suppresses the signon messages like /C (Note: As IO.SYS 7.x appends "/D /K AUTOEXEC" or "/K NETSTART" to the SHELL= line, add a colon after the "K" to "mute" the signon.)

• Build 161 (Version 7.61) � 28 January 2008:
  * Correctly show the minor version number of OS/2 Warp 4.x
  * Correctly show X-DOS version and avoid NLS separator corruption in it
  * Recognise Wendin-DOS (rus as 4DOS.EXE; some commands fail there)

• Build 160 (Version 7.60) � 28 December 2007:
  * Auto-completion and SELECT now support filenames containing backquotes
  * HEAD/TAIL /V option header now always starts on new line if /C used
  * Return value of @FILEWRITE now equals the number of bytes written

• Build 159 (Version 7.59) � 27 October 2007:
  * Wildcard matches include all LFNs containing bracket characters ([])
  * Added @MD5 function for files using the RSA algorithm from RFC 1321
  * Updated help file for the above change

• CODE.DIF changes on 3 October 2007:
  * Integrated the changes by Michal Necasek for Open Watcom C
  * Changes allowing 4DOS build will appear in Open Watcom C version 1.8
  * VC 1.5x still builds a 100% identical executable file (same as build 158)

• Build 158 (Version 7.58) � 15 September 2007:
  * Direct screen output now works in monochrome video modes too
  * Amended sign-on message with information about 4DOS patches
  * Re-enabled the MOVE /W(ipe) option

• Build 157 (Version 7.57) � 27 July 2007:
  * Auto-completion of file names with many dots works in DOSLFN as in W9x
  * Creation / access times can now be TOUCHed in DOSLFN, not only in W9x
  * SELECT /X now works in DOSLFN too, not only in W9x
  * Fixed possible pointer underflow if @WORD and @FIELD count backwards
  * @WORD and @FIELD no longer return whole string if it has leading space
  * Added @FIELDS function
  * Updated help file for the above change

• Build 156 (Version 7.56) � 25 June 2007:
  * Show zero creation or access times in DOSLFN the same way as in W9x
  * Added _DATETIME and _MONTHF variables
  * Added @AGEDATE and @MONTHF functions
  * Updated help file for the above changes

• Build 155 (Version 7.55) � 14 May 2007:
  * Show proper CD/DVD-ROM disk space in raw DOS; fixes DIR in PCDOS7.1
  * Avoid false detection of MS-DOS 7 (MSDOS7 variable) in case of FreeDOS
  * DIR /2 /X in Windows now looks like in DOS and doesn't reach column 80
  * VER /R now displays also build date

• Build 154 (Version 7.54) � 20 April 2007:
  * Added message.* to global header dependency
  * Added high-level @EMS function code (was missing in original sources)
  * Added _alt,_capslock,_ctrl,_lshift,_numlock,_rshift,_scrolllock,_shift
  * Updated help file for the above change

• Build 153 (Version 7.53) � 15 February 2007:
  * Recognise LZ-DOS, RXDOS, DOS-ROM and S/DOS
  * The "Marked" message of SELECT no longer shifts even on largest files
  * 8.3 file size over 1 GB no longer misaligns DIR, TREE or SELECT output
  * Updated help for the above (maximal non-wrap description size now 39)

• Build 152 (Version 7.52) � 4 February 2007:
  * Correctly process the "invalid disk change" code during critical error
  * Irrelevant error codes in critical error converted to "general failure"
  * Added a /L(ine offset) option to LIST
  * Updated help file for the above change

• Build 151 (Version 7.51) � 31 January 2007:
  * For Novell DOS and DR-DOS 7.x-8.0, show the right DOS version
  * For hard errors, show operation and drive; accept only allowed actions
  * DOS error messages amended and edited to clarify and remove duplicates
  * Updated help file for the above change

• Build 150 � 25 January 2007:
  * Fixed the "Lock violation on COPY from remote drive without SHARE" bug
  * Worked around a bug (in MSVCRT?!) leaving high byte of _doserrno != 0
  * VER_MINOR = VER_BUILD - 100 from now on (version 7.51 = build 151)

• Build 149 � 18 January 2007:
  * Fixed the "DIR [PATH] finds no files in DOS LFN volumes" bug
  * An * instead of *.* default wildcard is now used for DOS LFN volumes
  * FFIND /U (summary only) option can now be evaluated by @EXECSTR
  * FFIND and LIST search can now be interrupted with Ctrl-C

• 4HELP Changes on 15 January 2007
  4HELP now supports mouse wheel (As for 4DOS, a driver that supports wheel is needed, e.g. Cute Mouse 2.x; the W9x driver does not support wheel for the DOS mouse API.)

• Build 148 � 10 January 2007:
  * LIST, SELECT and command history window now support mouse wheel (Note: A driver that supports wheel is needed, e.g. Cute Mouse 2.x)
  * The right mouse button now exits LIST and SELECT

• Build 147 � 8 January 2007:
  * Fixed command line buffer overflow when repeatedly pressing F12
  * Added hexadecimal output option to @EVAL
  * Updated help file for the above change

• Build 146 � 7 January 2007:
  * Fixed command line buffer overflow and path search name underflow bug
  * Added new @CWD and @CWDS functions
  * Updated help file for the above change

• Build 145 � 6 January 2007:
  * @READY now equals the inverted "no disk in drive" bit for CD-ROMs
  * Added new EJECTMEDIA and CLOSETRAY commands
  * Updated help file for the above change

• Build 144 � 30 December 2006:
  * Added a /V(erbose) option to TYPE to show a header for each file
  * Added a /P(ower off) option to REBOOT to shut the system down
  * REBOOT now flushes SMARTDRV cache before reboot or power off
  * Updated help file for the above changes

• Build 143 � 29 December 2006:
  * /P page prompts are now overwritten like DR-/PTS-DOS COMMAND.COM
  * Restored DOS version 2.x compatibility of 4DOS.COM, lost in v6
  * 4DOS.COM now aborts on attempt to run it in DOS version 1.x

• Build 142 � 26 December 2006:
  * Restored 8086/8088 (PC/XT, Pravetz-16, etc.) compatibility, lost in v6
  * Added compatibility information about CADStar PCB in the help file
  * Added @SERIAL function; help file updated for it too

• Build 141 � 24 December 2006:
  * Added GB units to file size ranges, @DISK* and @FILESIZE functions
  * DIR /4 now shows size of files over 1 GB with precision of 0.1 GB
  * Added information about the above features in the help file

• Build 140 � 22 December 2006:
  * For Pentium 4 and up, _CPU now returns 786
  * Removed the @READY warning from 4DOS.HLP and added 786 info to it
  * Added build.h dependency for expand, removed shareware dependencies

• Build 139 � 21 December 2006:
  * Recognise Datalight ROM-DOS
  * Can now load in upper memory in PTS-DOS
  * @READY now works properly in PTS-DOS

• Build 138 � 19 December 2006:
  * @READY now works more reliably with CD-ROM drives
  * Removed unused modules "batcomp" and "parspath" from 4DOS.LNK
  * INTVER = VER_BUILD again, now OPTION.EXE patched on each build

• Build 137 � 17 December 2006:
  * Re-enabled _4INST.BTM (self-installer) support
  * Added the installer files from version 6.02 (1999) to the archive
  * 4DOS.HLP replaced by extended and updated version by Charles Dye

• Build 136 � 15 December 2006:
  * Process the DR-DOS F5/F8 startup keystrokes too
  * Fixed the "%* affected by the SHIFT command" bug
  * Removed the unused (non-4DOS and shareware) error messages

• Build 135 � 13 December 2006:
  * No longer mistake DR-DOS 7.0x for Novell DOS
  * Recognise PC DOS, FreeDOS, PTS-DOS and DR-DOS 7.03
  * Fixed the "DIR /F and DIR /B /S disable colourisation" bug

• Build 134 � 9 December 2006:
  * Batch debugger now refuses to load batch files over the 64 KB size limit
  * Fixed the "total @FILESIZE roll-over at 4 GB" bug
  * Fixed the "DESCRIBE loses third-party info" bug

• Build 133 � 7 December 2006:
  * Properly show FAT32 drive space in MS/PC/LZ/EDR/PTS/ROM/FreeDOS
  * Properly show free XMS memory in the MEMORY command if > 64 MB
  * Re-enabled the /Y single-stepping option that was disabled in 2003
  * Fixed the "SET /M not upper-casing master environment variables" bug
  * Fixed the "RD not removing hidden and system sub-directories" bug
  * Fixed the C4018 "signed/unsigned mismatch" C compiler warnings
  * Reverted INTVER from 131 to 130 to make OPTION compatible