Digital Research

In 1972, Gary Kildall, an instructor at the Naval Postgraduate School in Monterey, California, began working at Intel as a consultant under the business name Microcomputer Applications Associates (MAA)."[16] In a parallel development Digital Research also produced a selection of programming language compilers and interpreters for their OS-supported platforms, including C, Pascal, COBOL, FORTRAN, PL/I, PL/M, CBASIC, BASIC, and Logo.[citation needed] Microsoft seized this opportunity to supply an OS, in addition to other software (e.g., BASIC) for the new IBM PC.This practice led to a US Department of Justice investigation, resulting in a decision in 1994 that barred Microsoft from "per-processor" licensing.[19] Successive revisions of Concurrent CP/M incorporated MS-DOS API emulation (since 1983), which gradually added more support for DOS applications and the FAT file system.[citation needed] In 1985, soon after the introduction of the 80286-based IBM PC/AT, Digital Research introduced a real-time system, initially called Concurrent DOS 286.[citation needed] In 1985 Digital Research also produced a microcomputer version of the GKS graphics standard (related to NAPLPS) called GSX, and later used this as the basis of their GEM GUI.Digital Research (and later its successor Caldera) accused Microsoft of announcing vaporware versions of MS-DOS to suppress sales of DR DOS.
Graphics Environment Manager (GEM) Graphic User Interface (GUI) in 1985
Digital Equipment CorporationPacific Grove, CaliforniaSoftwareUnited StatesGary KildallNovellMonterey, CaliforniaDorothy McEwen KildallGordon EubanksTom RolanderKathryn StrutynskiEd McCrackenCompilersoperating systemsgraphical user interfacesCP/M operating systemConcurrent DOSFlexOSMultiuser DOSDOS PlusDR DOSmicrocomputerNaval Postgraduate Schoolconsultantdisk operating systemmicrocomputersde factoMS-DOSCP/M-8616-bit systemMP/M-86Concurrent CP/MJerry PournelleInfoworldIntel 80286Motorola 68000AT&T CorporationUnix System Vprogramming languageinterpretersPascalFORTRANCBASICIBM Personal ComputerIntel 8086Intel 8088MicrosoftPC DOS86-DOSTriumph of the NerdsThe Computer ChroniclesMS-DOS API emulationFAT file systemConcurrent PC DOSIBM PC/ATConcurrent DOS 286NAPLPSWindows 1.0Calderavaporwareenvironment variablesConcurrent DOS XMConcurrent DOS 386beta releaseWindows 3.1AARD codeCaldera (company)Siemens S5-DOS/MTIBM 4680 OS4690 OSEdward R. McCrackenCompiler Systems, Inc.MT MicroSYSTEMS, Inc.Pascal/MT+Multiuser DOS FederationNovell Digital Research Systems GroupCaldera Digital Research Systems GroupMarkoff, John GregoryThe New York TimesPopular Computing, Inc.Business WireBrown, Ralf D.Addison WesleyDigital DialogueCW Communications Inc.ComputerworldCW Communications, Inc.Swaine, MichaelDr. Dobb's Special ReportKildall, Gary ArlenElectronic DesignPC MagazineThe Washington PostDr. Dobb's JournalMiller Freeman, Inc.Digital Research, Inc.Wayback MachineProgramminglanguagesDr. LogoDr. SchemeAtari PascalBatteryMAXCMD fileCOM fileDOS Protected Mode ServicesDynamic Debugging ToolFile Control BlockGEM character setPeripheral Interchange ProgramResource construction setViewMAXZero pageDR-DOSCPMulatorStar Trek projectList of computers running CP/M