PCjs Machines
Home of the original IBM PC emulator for browsers.
IBM PC DOS 4.00
PC DOS 4.00 was released in July 1988.
A Feature Summary, along with Directory Listings of the five 360Kb distribution diskettes, are provided below.
[PCjs Machine "ibm5170-pcdos400"]
Waiting for machine "ibm5170-pcdos400" to load....
Feature Summary
New features:
- SHARE loaded for FCB operations on hard disks greater than 32MB
- IFS driver support
- Disk buffers could be allocated in expanded memory (BUFFERS /X)
- DPB, SFT and CDS structures extended
- New internal version table
- DOS swappable data area changed
- Program names added to MCBs
- System block sub-MCB headers added (used by MEM)
- Most commands use new message retriever (allows message text separation for translation purposes)
Another significant change in DOS 4.00 was the ability to update the system files (IBMBIO.COM and IBMDOS.COM in PC DOS, or IO.SYS and MSDOS.SYS in MS-DOS) of any boot disk, by moving the first two directory entries (and the contents of the first three data sectors) as needed to make room for the new system files.
The SYS command in older versions of DOS would report “No room for system on destination disk” if the first two directory entries (or the first three data sectors) were unavailable. However, after using the DOS 4.00 SYS command, it usually became possible to install older DOS versions as well.
Learn more about the history of the SYS command from Microsoft Support.
New internal commands:
- TRUENAME
New external commands:
- FILESYS
- FORMAT /F (to specify disk size to format)
- 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 files:
- GRAPHICS.PRO
New functions:
- INT 21h functions 3305h, 5D0Bh, 5F05h-5F08h, 6507h, 6520h-6523h, 65A0h-65A3h, 69h-6Ch
- INT 2Fh multiplex function 1Ah (ANSI.SYS)
Directory of PC DOS 4.00 (Disk 1)
Volume in drive A has no label
Directory of A:\
IBMBIO COM* 32816 8-03-88 12:00p
IBMDOS COM* 36000 8-03-88 12:00p
COMMAND COM 37637 6-17-88 12:00p
AUTOEXEC BAT 39 6-17-88 12:00p
CONFIG SYS 96 6-17-88 12:00p
COUNTRY SYS 12838 6-17-88 12:00p
DISKCOPY COM 10428 6-17-88 12:00p
DISPLAY SYS 15741 6-17-88 12:00p
FDISK COM 70151 6-17-88 12:00p
FORMAT COM 22923 6-17-88 12:00p
KEYB COM 14759 6-17-88 12:00p
KEYBOARD SYS 23360 8-03-88 12:00p
REPLACE EXE 17199 6-17-88 12:00p
SELECT COM 3674 8-03-88 12:00p
SELECT HLP 27562 8-03-88 12:00p
SELECT PRT 1594 8-03-88 12:00p
SYS COM 11472 6-17-88 12:00p
012345 678 109 6-17-88 12:00p
DOS00I 400* 0 6-17-88 12:00p
19 file(s) 338398 bytes
17408 bytes free
Directory of PC DOS 4.00 (Disk 2)
Volume in drive A has no label
Directory of A:\
COMMAND COM 37637 6-17-88 12:00p
ASSIGN COM 5785 6-17-88 12:00p
ATTRIB EXE 18247 6-17-88 12:00p
BASIC COM 1065 6-17-88 12:00p
BASICA COM 36285 6-17-88 12:00p
COMP COM 9491 6-17-88 12:00p
DEBUG COM 21606 6-17-88 12:00p
DISKCOMP COM 9889 6-17-88 12:00p
EDLIN COM 14249 6-17-88 12:00p
FILESYS EXE 11125 6-17-88 12:00p
FIND EXE 5983 6-17-88 12:00p
IFSFUNC EXE 21653 8-03-88 12:00p
JOIN EXE 17457 6-17-88 12:00p
LABEL COM 4490 6-17-88 12:00p
MEM EXE 20133 6-17-88 12:00p
MODE COM 23056 8-03-88 12:00p
MORE COM 2166 6-17-88 12:00p
MORTGAGE BAS 6207 6-17-88 12:00p
SHARE EXE 10301 8-03-88 12:00p
SORT EXE 5914 6-17-88 12:00p
SUBST EXE 18143 6-17-88 12:00p
TREE COM 6334 6-17-88 12:00p
XCOPY EXE 17087 6-17-88 12:00p
DOS01I 400* 0 6-17-88 12:00p
24 file(s) 324303 bytes
30208 bytes free
Directory of PC DOS 4.00 (Disk 3)
Volume in drive A has no label
Directory of A:\
COMMAND COM 37637 6-17-88 12:00p
CHKDSK COM 17771 6-17-88 12:00p
DISKCOPY COM 10428 6-17-88 12:00p
PCIBMDRV MOS 295 6-17-88 12:00p
PCMSDRV MOS 961 6-17-88 12:00p
PCMSPDRV MOS 801 6-17-88 12:00p
PRINT COM 14024 8-03-88 12:00p
SHELL CLR 4438 6-17-88 12:00p
SHELL HLP 65667 8-03-88 12:00p
SHELL MEU 4588 8-03-88 12:00p
SHELLB COM 3937 8-03-88 12:00p
SHELLC EXE 154377 8-03-88 12:00p
DOSUTIL MEU 6660 6-17-88 12:00p
012345 678 109 6-17-88 12:00p
DOS02I 400* 0 6-17-88 12:00p
15 file(s) 321693 bytes
36352 bytes free
Directory of PC DOS 4.00 (Disk 4)
Volume in drive A has no label
Directory of A:\
IBMBIO COM* 32816 8-03-88 12:00p
IBMDOS COM* 36000 8-03-88 12:00p
COMMAND COM 37637 6-17-88 12:00p
ANSI SYS 9148 6-17-88 12:00p
APPEND EXE 11186 8-03-88 12:00p
COUNTRY SYS 12838 6-17-88 12:00p
DISPLAY SYS 15741 6-17-88 12:00p
DRIVER SYS 5274 6-17-88 12:00p
FASTOPEN EXE 16302 6-17-88 12:00p
GRAFTABL COM 10271 6-17-88 12:00p
GRAPHICS COM 16733 6-17-88 12:00p
GRAPHICS PRO 9413 6-17-88 12:00p
KEYB COM 14759 6-17-88 12:00p
KEYBOARD SYS 23360 8-03-88 12:00p
MODE COM 23056 8-03-88 12:00p
NLSFUNC EXE 6910 6-17-88 12:00p
PRINTER SYS 18946 6-17-88 12:00p
RECOVER COM 10732 6-17-88 12:00p
VDISK SYS 6376 6-17-88 12:00p
4201 CPI 6404 6-17-88 12:00p
4208 CPI 641 6-17-88 12:00p
5202 CPI 402 6-17-88 12:00p
DOS03I 400* 0 6-17-88 12:00p
23 file(s) 324945 bytes
30720 bytes free
Directory of PC DOS 4.00 (Disk 5)
Volume in drive A has no label
Directory of A:\
BACKUP COM 33754 6-17-88 12:00p
EGA CPI 49052 6-17-88 12:00p
FORMAT COM 22923 6-17-88 12:00p
LCD CPI 10592 6-17-88 12:00p
MODE COM 23056 8-03-88 12:00p
RESTORE COM 40030 6-17-88 12:00p
SELECT DAT 22453 8-03-88 12:00p
SELECT EXE 99545 8-03-88 12:00p
XMAEM SYS 19312 6-17-88 12:00p
XMA2EMS SYS 29249 8-03-88 12:00p
DOS04L 400* 0 6-17-88 12:00p
11 file(s) 349966 bytes
9216 bytes free
Directory of PC DOS 4.00 (TechRef)
Volume in drive A has no label
Directory of A:\
DEBUG COM 21606 6-17-88 12:00p
EXE2BIN EXE 7973 6-17-88 12:00p
LIB EXE 47107 6-17-88 12:00p
LINK EXE 105406 6-17-88 12:00p
VDISK ASM 75571 6-17-88 12:00p
5 file(s) 257663 bytes
102400 bytes free