IBM DOS Version 4.00



Labels used with permission of IBM® Corporation
Labels copyright © IBM® Corporation

Boot Screen:


Copyright © IBM® Corporation
IBM DOS version 4.00 was the first to come with an installation setup when the system boot from the Install disk. Previous to this all versions would boot the system and display a version header after prompting for date and time.

Package Contents:

Package images used with permission
IBM® Corporation
Outer Cover, P/N: 68X2568
Paper Cover, P/N: 6280256
Binder P/N: see paper cover #
License Information Pamphlet, P/N: 15F1376
Proof of License, P/N: 15F1375
Getting Started Guide, P/N: 15F1581
DOS Shell Reference Card, P/N: 15F1374
User Manual, P/N: 15F1371
Install Diskette, P/N: 15F1377
Operating Diskette, P/N: 15F1381
Also released on (5) 360k floppies, P/N:6280225

Collector's notes:
Rated: Available.
Estimated Value (complete): Mint-$100 VG-$50 G-$30

Vital Statistics:

Release Date: June, 1988
Disks in Set: 2
Diskette Form Factor:3.5", DS,DD 9 sectors per track
Capacity: 720k
Sector Size: 512 bytes
Sectors per cluster: 1
Reserved sectors: 1
Root directory entires: 112
Total sectors: 1440
Media descriptor: F9
Sectors per FAT: 5
Track Size: 9 sectors
Disk Sides: 2
Total Tracks: 80
File System: FAT12 floppy, FAT16 fixed disk
Files on Disk1: 36
Files on Disk 2: 40
Version String (Sector 04F, offset 0DAh):



E6 B4 3D F9 CD 21 C3 B0 03 CF 49 42 4D 20 44 4F ¦   =  !    IBM DO

53 20 56 65 72 73 69 6F 6E 20 34 2E 30 30 20 28 ¦ S Version 4.00 (

43 29 43 6F 70 79 72 69 67 68 74 20 49 42 4D 20 ¦ C)Copyright IBM

43 6F 72 70 20 31 39 38 31 2C 31 39 38 38 4C 69 ¦ Corp 1981,1988Li

63 65 6E 73 65 64 20 4D 61 74 65 72 69 61 6C 20 ¦ censed Material

2D 20 50 72 6F 67 72 61 6D 20 50 72 6F 70 65 72 ¦ - Program Proper

74 79 20 6F 66 20 49 42 4D 4E 55 4C 00 43 4F 4E ¦ ty of IBMNUL CON


File Listing:

Disk 1 Install: 06/17/1988 12:00p 32,810 IBMBIO.COM 06/17/1988 12:00p 35,984 IBMDOS.COM 06/17/1988 12:00p 39 AUTOEXEC.BAT 06/17/1988 12:00p 9,148 ANSI.SYS 06/17/1988 12:00p 37,637 COMMAND.COM 06/17/1988 12:00p 96 CONFIG.SYS 06/17/1988 12:00p 12,838 COUNTRY.SYS 06/17/1988 12:00p 10,428 DISKCOPY.COM 06/17/1988 12:00p 15,741 DISPLAY.SYS 06/17/1988 12:00p 5,274 DRIVER.SYS 06/17/1988 12:00p 16,302 FASTOPEN.EXE 06/17/1988 12:00p 70,151 FDISK.COM 06/17/1988 12:00p 22,923 FORMAT.COM 06/17/1988 12:00p 21,637 IFSFUNC.EXE 06/17/1988 12:00p 14,759 KEYB.COM 06/17/1988 12:00p 23,360 KEYBOARD.SYS 06/17/1988 12:00p 23,040 MODE.COM 06/17/1988 12:00p 18,946 PRINTER.SYS 06/17/1988 12:00p 17,199 REPLACE.EXE 06/17/1988 12:00p 22,453 SELECT.DAT 06/17/1988 12:00p 99,791 SELECT.EXE 06/17/1988 12:00p 27,562 SELECT.HLP 06/17/1988 12:00p 1,594 SELECT.PRT 06/17/1988 12:00p 10,285 SHARE.EXE 06/17/1988 12:00p 11,472 SYS.COM 06/17/1988 12:00p 6,376 VDISK.SYS 06/17/1988 12:00p 17,087 XCOPY.EXE 06/17/1988 12:00p 29,236 XMA2EMS.SYS 06/17/1988 12:00p 19,312 XMAEM.SYS 06/17/1988 12:00p 49,052 EGA.CPI 06/17/1988 12:00p 10,592 LCD.CPI 06/17/1988 12:00p 6,404 4201.CPI 06/17/1988 12:00p 641 4208.CPI 06/17/1988 12:00p 402 5202.CPI 06/17/1988 12:00p 109 012345.678 06/17/1988 12:00p 0 DOS00I.400 36 File(s) 700,680 bytes 0 Dir(s) 17,920 bytes free 728,064 bytes total disk space. 69,632 bytes in 3 hidden files. 640,512 bytes in 33 files. 17,920 bytes available on disk. 512 bytes in each allocation unit. 1,422 total allocation units on disk. 35 allocation units available on disk. Disk 2 Operating: 06/17/1988 12:00p 11,170 APPEND.EXE 06/17/1988 12:00p 5,785 ASSIGN.COM 06/17/1988 12:00p 18,247 ATTRIB.EXE 06/17/1988 12:00p 33,754 BACKUP.COM 06/17/1988 12:00p 1,065 BASIC.COM 06/17/1988 12:00p 36,285 BASICA.COM 06/17/1988 12:00p 17,771 CHKDSK.COM 06/17/1988 12:00p 9,491 COMP.COM 06/17/1988 12:00p 21,606 DEBUG.COM 06/17/1988 12:00p 9,889 DISKCOMP.COM 06/17/1988 12:00p 6,660 DOSUTIL.MEU 06/17/1988 12:00p 14,249 EDLIN.COM 06/17/1988 12:00p 11,125 FILESYS.EXE 06/17/1988 12:00p 5,983 FIND.EXE 06/17/1988 12:00p 22,923 FORMAT.COM 06/17/1988 12:00p 10,271 GRAFTABL.COM 06/17/1988 12:00p 16,733 GRAPHICS.COM 06/17/1988 12:00p 9,413 GRAPHICS.PRO 06/17/1988 12:00p 17,457 JOIN.EXE 06/17/1988 12:00p 4,490 LABEL.COM 06/17/1988 12:00p 20,133 MEM.EXE 06/17/1988 12:00p 2,166 MORE.COM 06/17/1988 12:00p 6,207 MORTGAGE.BAS 06/17/1988 12:00p 6,910 NLSFUNC.EXE 06/17/1988 12:00p 295 PCIBMDRV.MOS 06/17/1988 12:00p 961 PCMSDRV.MOS 06/17/1988 12:00p 801 PCMSPDRV.MOS 06/17/1988 12:00p 14,163 PRINT.COM 06/17/1988 12:00p 10,732 RECOVER.COM 06/17/1988 12:00p 17,199 REPLACE.EXE 06/17/1988 12:00p 40,030 RESTORE.COM 06/17/1988 12:00p 4,438 SHELL.CLR 06/17/1988 12:00p 66,977 SHELL.HLP 06/17/1988 12:00p 4,588 SHELL.MEU 06/17/1988 12:00p 3,937 SHELLB.COM 06/17/1988 12:00p 153,975 SHELLC.EXE 06/17/1988 12:00p 5,914 SORT.EXE 06/17/1988 12:00p 18,143 SUBST.EXE 06/17/1988 12:00p 6,334 TREE.COM 06/17/1988 12:00p 0 DOS01L.400 40 File(s) 668,270 bytes 0 Dir(s) 50,688 bytes free 728,064 bytes total disk space. 0 bytes in 1 hidden files. 677,376 bytes in 39 files. 50,688 bytes available on disk. 512 bytes in each allocation unit. 1,422 total allocation units on disk. 99 allocation units available on disk.

MD5 Signatures:

IBMBIO COM C22COS1D3186CFFED10F70B4943DSOF2 IBMDOS COM 2479374D7B83BC160DD6CF284D5522ED COMMAND COM 2007AD825CIDBOIFC226527243B8C8E7 VER command: IBM DOS Version 4.00

Version History:

Superceeds IBM DOS 3.30. Added new graphical user shell for system interaction that runs in text or graphics mode. Added support for integrated Expanded memory (EMS) support. Support for non-partitioned fixed disks greater than 32MB added by using 32-bit vs. 16-bit for partition geometry. Automatically loads (SHARE) for support of disks larger than 32MB. Now uses menu-driven interaction process (SELECT) to install operating system (see boot screen above). Video/graphics support improved to support more than 25 lines of text on EGA/VGA systems; includes updates for support of miltu-language codepage. (APPEND) enhanced for better search control. (BACKUP) automatically formats target diskette if unformatted. (COUNTRIES) now expanded to include support for Japan, Korea, China, and Taiwan.

(MEM) command introduced - allows a display of memory configuration. IBM DOS 4.00 Contains maintenance updates. Maintains most compatibility with programs running on DOS 3.30. Care should be taken using third-party disk management utilities that write directly to disk hardware without using DOS function calls, as access to the 4.00 file structure may result in total loss of of data. IBM DOS 4.00 was IBM's first in-house development effort with DOS. Prior to this release, all DOS code had been managed by Microsoft on IBM's behalf (hence the parallel releases). With this version, IBM re-engineered the source and added their own enhancements.