--- layout: page title: Microsoft MS-DOS 4.01 permalink: /disks/pcx86/dos/microsoft/4.01/ redirect_from: - /disks/pc/dos/microsoft/4.01/ machines: - type: pcx86 id: ibm5170-msdos401 config: /devices/pcx86/machine/5170/ega/640kb/rev1/machine.xml autoMount: A: name: MS-DOS 4.01 (Disk 1) path: /disks/pcx86/dos/microsoft/4.01/MSDOS401-DISK1.json --- Microsoft MS-DOS 4.01 --- The PCjs machine below is running PC-DOS 4.01. {% include machine.html id="ibm5170-msdos401" %} MS-DOS 4.01 was released in April 1989. The contents of the six 360Kb distribution diskettes are shown below. ### Directory of MS-DOS 4.01 (Disk 1) Volume in drive A is INST V401 Volume Serial Number is 2A33-13E4 Directory of A:\ IO SYS 33337 04-07-89 12:00a MSDOS SYS 37376 04-07-89 12:00a AUTOEXEC BAT 39 04-07-89 12:00a COMMAND COM 37557 04-07-89 12:00a CONFIG SYS 96 04-07-89 12:00a COUNTRY SYS 12806 04-07-89 12:00a DISKCOPY COM 10396 04-07-89 12:00a DISPLAY SYS 15692 04-07-89 12:00a FDISK EXE 60935 04-07-89 12:00a FORMAT COM 22875 04-07-89 12:00a KEYB COM 14727 04-07-89 12:00a KEYBOARD SYS 23328 04-07-89 12:00a REPLACE EXE 19415 04-07-89 12:00a SELECT COM 3642 04-07-89 12:00a SELECT HLP 28695 04-07-89 12:00a SELECT PRT 1329 04-07-89 12:00a SYS COM 11456 04-07-89 12:00a 17 File(s) 18432 bytes free ### Directory of MS-DOS 4.01 (Disk 2) Volume in drive A is OP#1 V401 Directory of A:\ ASSIGN COM 5753 04-07-89 12:00a ATTRIB EXE 18263 04-07-89 12:00a CHKDSK COM 17787 04-07-89 12:00a COMMAND COM 37557 04-07-89 12:00a COMP COM 9459 04-07-89 12:00a DEBUG COM 21574 04-07-89 12:00a DISKCOMP COM 9857 04-07-89 12:00a EDLIN COM 14069 04-07-89 12:00a FC EXE 15807 04-07-89 12:00a FILESYS EXE 11129 04-07-89 12:00a FIND EXE 5941 04-07-89 12:00a IFSFUNC EXE 21739 04-07-89 12:00a JOIN EXE 17813 04-07-89 12:00a LABEL COM 4458 04-07-89 12:00a MEM EXE 20005 04-07-89 12:00a MORE COM 2134 04-07-89 12:00a SHARE EXE 13424 04-07-89 12:00a SORT EXE 5882 04-07-89 12:00a SUBST EXE 18467 04-07-89 12:00a TREE COM 6302 04-07-89 12:00a XCOPY EXE 17055 04-07-89 12:00a 21 File(s) 56320 bytes free ### Directory of MS-DOS 4.01 (Disk 3) Volume in drive A is OP#2 V401 Directory of A:\ COMMAND COM 37557 04-07-89 12:00a EMM386 SYS 87776 04-07-89 12:00a EXE2BIN EXE 7963 04-07-89 12:00a GWBASIC EXE 80608 04-07-89 12:00a LINK EXE 43988 04-07-89 12:00a PRINT COM 14131 04-07-89 12:00a RAMDRIVE SYS 8235 04-07-89 12:00a README TXT 17825 04-07-89 12:00a SMARTDRV SYS 10224 04-07-89 12:00a XMA2EMS SYS 29211 04-07-89 12:00a 10 File(s) 21504 bytes free ### Directory of MS-DOS 4.01 (Disk 4) Volume in drive A is OP#3 V401 Volume Serial Number is 2A33-13E4 Directory of A:\ 4201 CPI 6404 04-07-89 12:00a 4208 CPI 720 04-07-89 12:00a 5202 CPI 370 04-07-89 12:00a ANSI SYS 9105 04-07-89 12:00a APPEND EXE 11154 04-07-89 12:00a COMMAND COM 37557 04-07-89 12:00a COUNTRY SYS 12806 04-07-89 12:00a DISPLAY SYS 15692 04-07-89 12:00a DRIVER SYS 5241 04-07-89 12:00a FASTOPEN EXE 16718 04-07-89 12:00a GRAFTABL COM 10239 04-07-89 12:00a GRAPHICS COM 16693 04-07-89 12:00a GRAPHICS PRO 9397 04-07-89 12:00a HIMEM SYS 6261 04-07-89 12:00a KEYB COM 14727 04-07-89 12:00a KEYBOARD SYS 23328 04-07-89 12:00a MODE COM 22960 04-07-89 12:00a NLSFUNC EXE 6878 04-07-89 12:00a PRINTER SYS 18914 04-07-89 12:00a RAMDRIVE SYS 8235 04-07-89 12:00a RECOVER COM 10588 04-07-89 12:00a 21 File(s) 15360 bytes free ### Directory of MS-DOS 4.01 (Disk 5) Volume in drive A is SELECT V401 Directory of A:\ BACKUP COM 36880 04-07-89 12:00a EGA CPI 49068 04-07-89 12:00a FORMAT COM 22875 04-07-89 12:00a LCD CPI 10703 04-07-89 12:00a MODE COM 22960 04-07-89 12:00a RESTORE COM 36946 04-07-89 12:00a SELECT DAT 22999 04-07-89 12:00a SELECT EXE 95107 04-07-89 12:00a XMA2EMS SYS 29211 04-07-89 12:00a 9 File(s) 30720 bytes free ### Directory of MS-DOS 4.01 (Disk 6) Volume in drive A is SHELL V401 Directory of A:\ CHKDSK COM 17787 04-07-89 12:00a COMMAND COM 37557 04-07-89 12:00a DISKCOPY COM 10396 04-07-89 12:00a DOSUTIL MEU 6660 04-07-89 12:00a PCIBMDRV MOS 263 04-07-89 12:00a PRINT COM 14131 04-07-89 12:00a SHELL HLP 66527 04-07-89 12:00a SHELL MEU 4588 04-07-89 12:00a SHELL CLR 4406 04-07-89 12:00a SHELLB COM 3894 04-07-89 12:00a SHELLC EXE 153855 04-07-89 12:00a 11 File(s) 36864 bytes free --- Additional details about MS-DOS 4.01 from [PC DOS Retro](https://sites.google.com/site/pcdosretro/doshist): - distributed on 2 720KB floppy disks [also released on 6 360KB diskettes; the number of 720KB diskettes needs to be verified] - maintenance release - DOS version is reported as 4.00 [although the VER command reports "4.01"] - SHARE loaded for FCB operations on hard disks greater than 32MB - IFS driver support added - MEM command added to report memory usage - new internal command: TRUENAME - new external commands: FILESYS, IFSFUNC, MEM - new CONFIG.SYS commands: COMMENT, CPSW, IFS, INSTALL, MULTITRACK, REM, SWITCHES - new device drivers: SMARTDRV.SYS (MS-DOS), XMA2EMS.SYS, XMAEM.SYS - new support file: GRAPHICS.PRO - disk buffers could be allocated in expanded memory (BUFFERS /X) - DPB, SFT and CDS structures extended - new internal version table added - DOS swappable data area changed - program names added to MCBs - INT 21h functions 3305h, 5D0Bh, 5F05h-5F08h, 6507h, 6520h-6523h, 65A0h-65A3h, 69h-6Ch added - INT 21h functions 3303h-3304h, 5702h-5704h reserved but unused - INT 2Fh multiplex function 1Ah (ANSI.SYS) added