Digital Research PL/I Compiler (1983) 2 DOS CPM

PL/I is a programming language oriented towards scientific and business programming. Digital Research provided implementations for their CP/M operating system as well as MS-DOS.

• 1.x

Digital UNIX (1995) 1 Unix

Formerly OSF/1, in 1994 after the Open Software Foundation (run by DEC, IBM, and HP) ceased involvement, Digital Equipment Corporation renamed the OS to "Digital UNIX". In 1998, DEC was bought out by Compaq and the product was again renamed, to Tru64 UNIX.

• 3.2B
• 3.2G
• 4.0B
• 4.0D
• 4.0E

Digitalk Smalltalk/V (1986) 3 DOS Windows OS2

Smalltalk/V was the first widely available version of Smalltalk. It was developed by Digitalk in 1986 for DOS, Macintosh, and later Windows.

• 1.2 (DOS)
• 2.x (Win)
• 1.x (OS/2)

Dilbert Break A Day (1997) 1 Novelty Windows MacOS

Released in 1997 by DayBreak Software, Break A Day is a calendar that shows a different Dilbert comic every day. Includes a 16-bit Windows 3.1 version, 32-bit Windows 9x/NT version, and a Mac version.

• 1

Direct Access (1988) 2 Utility DOS Windows

Direct Access is an easy to use menuing program designed to simplify access to applications on systems with many programs loaded on the hard drive. It is customizable, includes screen blanking, and includes password protection and usage logging. Later versions also detect common programs already installed on the hard disk.

• 4.x
• 5.x
• 1.0 (Win)

Disk Technician (1987) 0 Utility DOS

Disk Technician, from Prime Solutions Inc., is a hard disk utility and surface monitor. It contains an interleave adjuster and pattern tester similar to Spinrite. The Gold version also includes a defragmenter and disk-level virus protection.

• 4.x
• Advanced 3.x
• Gold 1.x

Disk-Count Software The Spreadsheet (1988) 0 Spreadsheet DOS

This is a low-end spreadsheet program from Disk-Count software, a vendor notable for their budget software titles. "This program is designed for the first time user with the capability for more advanced users. A spreadsheet is ideal for calculating any set of numbers that you normally would do by hand. Some of the uses are for preparing home budgets, calculating financial payments, tracking car expenses, and creating statistical models."

• 1.x

DiskClone (1998) 0 Utility DOS

DiskClone, from Quarterdeck, is a simple, professional, small, powerful, and easy to use hard disk cloning tool. It can copy a drive to another internal or external drive of different sizes. It can be used as a backup, or a migration tool to a new drive. It all fits on a single floppy disk. "Corporate" editions.

• 1.0

DiskDoubler (1990) 0 Utility Archive MacOS

DiskDoubler is an automated file compression program for the Apple Macintosh. It does not compress the entire drive, but rather specified files. It automatically compresses and recompresses files as you use them.

• 3.x

Diskeeper (2001) 0 Utility Windows

Diskeeper is a professional disk defragmenting tool with versions for both 9x and NT. It includes features such as scheduling and background defragmentation.

• 6.0

Diskette Manager (1988) 0 Utility DOS

Diskette Manager, from BLOC publishing, previously from Lassen Software, is a software tool for the IBM PC and Tandy that inventories the contents of your floppy disks in to a database. It enables you to quickly and easily search for files or print disk labels.

• 3

DiskLock (1993) 0 Utility DOS Windows

DiskLock, From Fifth Generation Systems, and later from Symantec as Norton DiskLock, is a data security tool that can lock a hard disk or individual files or directories so that it requires a password to access any data. It can also log activity to detect unauthorized access attempts. It also features the ability to lock the system after an idle usage period. There were versions for PC and Mac.

• 2.x
• 3.x

Disney Animation Studio (1992) 0 Graphics DOS

Disney Animation Studio is an animation graphics tool, that originated on the Amiga. It supports multiple VGA resolutions.

• IBM (1992)

Display Enhancement Package for TI-99/4a (1982) 0 Other

The Display Enhancement Packageby OAK Tree Systems This is a library that permits easy access to the the TI-99/4a 40-colum video text mode.

• 1982

DisplayWrite (1984) 5 Word Processor DOS OS2

DisplayWrite is a word processor that is based on the IBM Displaywriter dedicated word processing system. It directly competed with software ports of dedicated word processors such as the Wang Word Processing System (or its clone MultiMate ), Lanier Word Processing Software, Xerox, DEC, or similar.

• 1
• 2
• 3
• 4
• 4/2
• 5

DIV Games Studio (2000) 5 DOS

DIV Games Studio, from Hammer Technologies, is an all-in-one software program for DOS for creating your own (DOS) games, using a programming language similar to C or Pascal. The software includes an integrated development environment with code editor, graphics editor and sound editor.

• 1.x

DOOM (1993) 62 DOS

Doom is the original fully immersive 3-D first person shooter from ID software.

• Alphas
• 1.0
• 1.1
• 1.2
• 1.25

DOS Plus (1986) 0 DOS

Digital Research's DOS Plus was an intermediate product between CP/M-86 and DR-DOS. It can run both CP/M-86 and MS-DOS programs, and read both disk formats. It is essentially a stripped down version of Concurrent DOS that keeps the DOS compatiblity.

• 1.x
• 2.x

DOS USB Support (2001) 14 DOS

Yes, there are USB drivers for DOS... Miracle-driver from Panasonic Japan does the unthinkable Before you start scratching your head, let me repeat that this is not related to your favorite linux distro's or Windows XP/W2K/98/ME's USB support, this has to do with people like me, booting some flavor of DOS to copy files around or using DOS-based partition back-up software.

• 1.x

DosFax (1992) 2 Communications DOS

Delrina DosFax is a DOS based program for sending and receiving faxes via a modem that has fax capabilities. This software was often bundled with modems or PCs. It was often accompanied by Delrina WinFax.

• 2.0

Double Helix (1986) 0 Database MacOS

Helix/Double Helix is an easy to use relational database for the Apple Macintosh. It features a visual programming system, and options for multiuser over AppleTalk.

• 1.0

DoubleDisk (1991) 0 Utility DOS

First released in 1989, DoubleDisk was the first real-time drive compression product for DOS. It is a fairly no-frills program and sticks to what it does best. It was relatively low cost compared to its later competitors. and Expandz! Plus

• 2.5
• 2.6

DoubleDOS (1984) 1 Utility DOS

DoubleDOS is a simple and easy to use multitasking tool for DOS. It can preemptively run up to two DOS programs at a time. Its main advantage is that it requires very little RAM overhead compared to other multitasking or task switching environments. Because DOS programs can and usually do bypass OS calls, many programs must be "patched" in order to work. things at once, then this would have been a good choice. Reportedly, the first version may have worked with DOS 1.x.

• 2.x
• 4.02

DoubleTools for DoubleSpace (1993) 0 Utility DOS

DoubleTools is a set of Windows-based utilities that adds functionality to DoubleSpace, included with MS-DOS 6.0.

• 1.0

DR DOS (1990) 37 DOS

DR DOS is an MS-DOS compatible operating system from Digital Research that evolved from their earlier CP/M-86 based products Concurrent DOS and DOS Plus.

• 5.x
• 6.x
• 7.x
• 8.x