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GEM (desktop environment)

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(Redirected from GEM Artline)
Not to be confused with Graphics Environment for Multimedia.

GEM
Developer(s)Digital Research
Lee Jay Lorenzen
Initial release28 February 1985; 39 years ago (1985-02-28)[1]
Stable release
GEM/3 3.11 / 3 November 1988; 36 years ago (1988-11-03)
Operating systemMS-DOS, Concurrent DOS, FlexOS, CP/M-68K, GEMDOS, TOS
PlatformIntel 8088, Motorola 68000
TypeWindowing system
LicenseGPL-2.0-only
Websitewww.deltasoft.com

GEM (for Graphics Environment Manager[2]) is a discontinued operating environment released by Digital Research in 1985. GEM is known primarily as the native graphical user interface of the Atari ST series of computers, providing a WIMP desktop. It was also available for IBM PC compatibles[3][4] and shipped with some models from Amstrad. GEM is used as the core for some commercial MS-DOS programs, the most notable being Ventura Publisher. It was ported to other computers that previously lacked graphical interfaces, but never gained traction. The final retail version of GEM was released in 1988.

Digital Research later produced X/GEM for their FlexOS[3][5] real-time operating system with adaptations for OS/2 Presentation Manager[6][3] and the X Window System under preparation as well.[3]

History

[edit]

GSX

[edit]
GSX and CBASIC workflow diagram
GSX advertisement in 1982

In late 1984, GEM started life at DRI as an outgrowth of a more general-purpose graphics library known as GSX (Graphics System Extension),[7] written by a team led by Don Heiskell since about 1982.[8] Lee Jay Lorenzen (at Graphic Software Systems) who had recently left Xerox PARC (the birthplace of the modern GUI) wrote much of the code. GSX was essentially a DRI-specific implementation of the GKS graphics standard proposed in the late 1970s. GSX was intended to allow DRI to write graphics programs (charting, etc.) for any of the 8-bit and 16-bit platforms CP/M-80, Concurrent CP/M, CP/M-86 and MS-DOS (NEC APC-III) would run on,[9] a task that otherwise would have required considerable effort to port due to the large differences in graphics hardware (and concepts) between the various systems of that era.[7]

GSX consisted of two parts: a selection of routines for common drawing operations, and the device drivers that are responsible for handling the actual output. The former was known as GDOS (Graphics Device Operating System) and the latter as GIOS (Graphics Input/Output System),[10] a play on the division of CP/M into the machine-independent BDOS (Basic Disk Operating System) and the machine-specific BIOS (Basic Input/Output System).[7] GDOS was a selection of routines that handled the GKS drawing, while GIOS actually used the underlying hardware to produce the output.[7]

Known 8-bit device drivers

[edit]

Known 16-bit device drivers

[edit]

The DOS version of GSX supports loading drivers in the CP/M-86 CMD format. Consequently, the same driver binary may operate under both CP/M-86 and DOS.[14]

GEM

[edit]

Intel versions

[edit]

The 16-bit version of GSX 1.3[7][9] evolved into one part of what would later be known as GEM, which was an effort to build a full GUI system using the earlier GSX work as its basis. Originally known as Crystal as a play on an IBM project called Glass, the name was later changed to GEM.

Under GEM, GSX became GEM VDI (Virtual Device Interface), responsible for basic graphics and drawing.[10] VDI also added the ability to work with multiple fonts and added a selection of raster drawing commands to the formerly vector-only GKS-based drawing commands. VDI also added multiple viewports, a key addition for use with windows.[15]

A new module, GEM AES (Application Environment Services), provided the window management and UI elements, and GEM Desktop used both libraries in combination to provide a GUI.[16] The 8086 version of the entire system was first officially demoed at COMDEX in November 1984,[4][3] following a demonstration on the 80286-based Acorn Business Computer in September 1984 where the software had been attributed to Acorn,[17] and the system was shipped as GEM/1 on 28 February 1985.[1]

GEM/1
[edit]
GEM 1.1 Desktop running in 640×350 EGA resolution

GEM Desktop 1.0 was released on 28 February 1985.[1] GEM Desktop 1.1 was released on 10 April 1985 with support for CGA and EGA displays.[18][19] A version for the Apricot Computers F-Series, supporting 640×200 in up to 8 colors, was also available as GEM Desktop 1.2.[20]

Digital Research also positioned Concurrent DOS 4.1 with GEM as alternative for IBM's TopView.[21]

DRI originally designed GEM for DOS so that it would check for and only run on IBM computers, and not PC compatibles like those from Compaq, as the company hoped to receive license fees from compatible makers. Developers reacted with what BYTE described as "a small explosion"; it reported that at a DRI-hosted seminar in February 1985, more than half of the attendees agreed that GEM's incompatibility with Compaq was a serious limitation. Later that month the company removed the restriction.[22] Applications that supported GEM included Lifetree Software's GEM Write.[23]

At this point, Apple Computer sued DRI[24][unreliable source?] in what would turn into a long dispute over the "look and feel" of the GEM/1 system, which was an almost direct copy of Macintosh (with some elements bearing a closer resemblance to those in the earlier Lisa, available since January 1983). This eventually led to DRI being forced to change several basic features of the system.[25][26][27][28][24] (See also: Apple v. Digital Research.) Apple would later go on to sue other companies for similar issues, including their copyright lawsuit against Microsoft and HP.

In addition to printers the system also contained drivers for some more unusual devices such as the Polaroid Palette.[13]

GEM/2
[edit]
GEM 2.0 displaying its Desktop Info dialog. This version of GEM supports 640×480 16-color VGA.

DRI responded with the "lawsuit-friendly" GEM Desktop 2.0, released on 24 March 1986, which eventually added support for VGA, sometime after its release in 1987.[29] It allowed the display of only two fixed windows on the "desktop" (though other programs could do what they wished), changed the trash can icon, and removed the animations for things like opening and closing windows. It was otherwise similar to GEM/1, but also included a number of bug fixes and cosmetic improvements.

In 1988 Stewart Alsop II said that GEM was among several GUIs that "have already been knocked out" of the market by Apple, IBM/Microsoft, and others.[30]

GEM XM
[edit]

GEM XM with "GEM Desktop 3.0" was an updated version of GEM/2 in 1986/1987 for DOS (including DOS Plus) which allowed task-switching and the ability to run up to ten GEM and DOS programs at once, swapping out to expanded memory (XM) through EMS/EEMS or to disk (including RAM disks, thereby also allowing the use of extended memory).[31][32][33][34] Data could be copied and pasted between applications through a clipboard with filter function (a feature later also found in TaskMAX under DR DOS 6.0).[32] Digital Research planned to offer GEM XM as an option to GEM Draw Plus users and through OEM channels.[31]

The GEM XM source code is now freely available under the terms of GNU General Public License.

See also: Concurrent DOS XM
GEM/3
[edit]
GEM 3.11 displaying its Desktop Info dialog

The last retail release was GEM/3 Desktop, released on 3 November 1988,[35] which had speed improvements and shipped with a number of basic applications. Commercial sales of GEM ended with GEM/3; the source code was subsequently made available to a number of DRI's leading customers.

While GEM/2 for the PC still provided a GSX API in addition to the GEM API; GEM/3 no longer did.[10]

GEM/4 for CCP Artline
[edit]

GEM/4, released in 1990, included the ability to work with Bézier curves, a feature still not commonly found outside the PostScript world.[citation needed] This version was produced specifically for Artline 2, a drawing program from the German company CCP Development GmbH.[36][37][38][39][40][41][42]

The system also included changes to the font management system, which made it incompatible with the likes of Timeworks Publisher.

Artline 1 still ran on GEM 3.1.[39]

GEM/5 for GST Timeworks Publisher
[edit]

Another version of GEM called GEM/5[43] was produced by GST Software Products for Timeworks' Publisher 2.1. It contained an updated look with 3D buttons, along with features such as on-the-fly font scaling. It came complete with all the standard GEM 3.1 tools. This version was produced from GEM 3.13 with only the Bézier handling taken from GEM/4.

ViewMAX for DR DOS
[edit]
Main article: ViewMAX
Screenshot of ViewMAX file manager with user-defined colors

GEM Desktop itself was spun off in 1990 as a product known as ViewMAX which was used solely as a file management shell under DR DOS. In this form the system could not run other GEM programs. This led to a situation where a number of applications (including ViewMAX) could exist all with their own statically linked copy of the GEM system. This scenario was actually rare, as few native GEM programs were published. In 1991, ViewMAX 2 was released.

In these forms, GEM survived until DRI was purchased by Novell in June 1991[44][45] and all GEM development was cancelled.

X/GEM
[edit]

Throughout this time DRI had also been working on making the GEM system capable of multitasking. This started with X/GEM based on GEM/1, but this required use of one of the multitasking CP/M-based operating systems.[clarification needed] DRI also produced X/GEM for their FlexOS[3][5] real-time operating system with adaptations for OS/2 Presentation Manager[6][3] and the X Window System under preparation as well.[3]

Ventura Publisher
[edit]

Lee Lorenzen left soon after the release of GEM/1, when it became clear that DRI had no strong interest in application development. He then joined with two other former DRI employees, Don Heiskell and John Meyer, to start Ventura Software. They developed Ventura Publisher (which was later marketed by Xerox and eventually by Corel), which would go on to be a very popular desktop publishing program for some time.

Atari versions

[edit]
TOS 4.92 (Atari Falcon) running HomePage Penguin and Desktop
Main article: Atari TOS

Development of the production 68000 version of GEM began in September 1984, when Atari sent a team called "The Monterey Group" to Digital Research to begin work on porting GEM. Originally, the plan was to run GEM on top of CP/M-68K, both ostensibly ported to Motorola 68000 by DRI prior to the ST design being created. In fact, these ports were unusable and would require considerable development. Digital Research also offered GEMDOS (originally written as GEM DOS), a DOS-like operating system aimed to port GEM to different hardware platforms. It was available for 8086 and 68000 processors and had been adapted to the Apple Lisa 2/5 and the Motorola VME/10[46] development system.[47] Atari decided in January 1985[48] to give up on the existing CP/M-68K code and instead port GEMDOS to the Atari ST platform, referring to it as TOS.[49]

As Atari had provided most of the development of the 68000 version, they were given full rights to continued developments without needing to reverse-license it back to DRI. As a result, the Apple-DRI lawsuit did not apply to the Atari versions of GEM, and they were allowed to keep a more Mac-like UI.

Over the next seven years, from 1985 to 1992, new versions of TOS were released with each new generation of the ST line. Updates included support for more colors and higher resolutions in the raster-side of the system, but remained generally similar to the original in terms of GKS support. In 1992, Atari released TOS 4, or MultiTOS, along with their final computer system, the Falcon030. In combination with MiNT, TOS 4 allowed full multitasking support in GEM.

Continued development

[edit]
Screenshot of OpenGEM 5

When Caldera bought the remaining Digital Research assets from Novell on 23 July 1996,[50] initial plans were to revive GEM and ViewMAX technologies for a low-footprint user interface for OpenDOS in mobile applications[51][52] as Caldera View, but these plans were abandoned by Caldera UK in favour of DR-WebSpyder and GROW. Caldera Thin Clients (later known as Lineo) released the source to GEM and GEM XM under the terms of GNU GPL-2.0-only in April 1999.[52] The development of GEM for PC continues as FreeGEM and OpenGEM.

On the Atari ST platform, the original DRI sources were ported again to be used in the free and open source TOS clone EmuTOS. New implementations of the AES portions of GEM have been implemented from scratch in the form of XaAES, and MyAES,[53] both of which are fully re-entrant and support multitasking on top of the FreeMiNT multitasking extensions to TOS.

Description

[edit]

The "full" GEM system consisted of three main parts:

  1. GEM VDI (Virtual Device Interface)
  2. GEM AES (Application Environment Services)
  3. GEM Desktop (an application providing drag-and-drop file management)

GEM VDI was the core graphics system of the overall GEM engine. It was responsible for "low level" drawing in the form of "draw line from here to here". VDI included a resolution and coordinate independent set of vector drawing instructions which were called from applications through a fairly simple interface. VDI also included environment information (state, or context), current color, line thickness, output device, etc.

These commands were then examined by GDOS, whose task it was to send the commands to the proper driver for actual rendering. For instance, if a particular GEM VDI environment was connected to the screen, the VDI instructions were then routed to the screen driver for drawing. Simply changing the environment to point to the printer was all that was needed (in theory) to print, dramatically reducing the developer workload (they formerly had to do printing "by hand" in all applications). GDOS was also responsible for loading up the drivers and any requested fonts when GEM was first loaded.

One major advantage VDI provided over the Macintosh was the way multiple devices and contexts were handled. In the Mac such information was stored in memory inside the application. This resulted in serious problems when attempting to make the Mac handle pre-emptive multitasking, as the drawing layer (QuickDraw) needed to have direct memory access into all programs. In GEM VDI however, such information was stored in the device itself, with GDOS creating "virtual devices" for every context – each window for instance.

GEM AES provided the window system, window manager, UI style and other GUI elements (widgets). For performance reasons, many of the GUI widgets were actually drawn using character graphics. Compared to the Macintosh, AES provided a rather spartan look and the system shipped with a single monospaced font.

AES performs its operations by calling the VDI, but in a more general sense the two parts of GEM were often completely separated in applications. Applications typically called AES commands to set up a new window, with the rest of the application using VDI calls to actually draw into that window.

GEM Desktop was an application program that used AES to provide a file manager and launcher, the traditional "desktop" environment that users had come to expect from the Macintosh. Unlike the Macintosh, the GEM Desktop ran on top of DOS (MS-DOS, DOS Plus or DR DOS on the PC, GEMDOS on the Atari), and as a result the actual display was cluttered with computer-like items, including path names and wildcards. In general, GEM was much more "geeky" than the Mac, but simply running a usable shell on DOS was a huge achievement on its own. Otherwise, GEM has its own advantages over Mac OS such as proportional sliders.

Native PC GEM applications use the file extension .APP for executables, whereas GEM desktop accessories use the file extension .ACC instead.[54][55] All desktop accessories (and also a few simple applications) can be run under ViewMAX without modification.[54][55]

See also

[edit]

References

[edit]
  1. ^ a b c Malloy, C. E., ed. (1985-07-02) [1985-03-20]. "DRI Ships GEM". A.N.A.L.O.G. TCS #1. Newsgroup: net.micro.atari. ihlpa.704. Retrieved 2020-01-11. Digital Research Inc.'s (DRI) new Graphics Environment Manager (GEM) system software was shipped as scheduled to original-equipment manufacturers (OEMs) February 28, the company announced March 11, 1985.
  2. ^ "Concurrent DOS - Powerful Multiuser Multitasking Operating Systems" (PDF). Digital Research Inc. 1988 [1987]. 1090-1411-002. Archived (PDF) from the original on 2019-11-26. Retrieved 2018-10-16.
  3. ^ a b c d e f g h Fitler, Bill (March 1989). "Writing portable applications with X/GEM - How does X/GEM compare with other windowing systems?". Dr. Dobb's Journal. Archived from the original on 2014-08-11. Retrieved 2016-11-24.
  4. ^ a b "Digital Research Announces GEM". Corporate Histories Collection - Computer History Museum. Archived from the original on 2011-07-25.
  5. ^ a b "Der GEM-Oldie von Digital Research läuft und läuft: Eine Benutzeroberfläche für diverse Rechnerarchitekturen". Computerwoche (in German). IDG Business Media GmbH. 1989-08-18. ISSN 0170-5121. Archived from the original on 2016-11-24. Retrieved 2016-11-24.
  6. ^ a b Barney, Douglas (1987-11-02). "Microbits: Waiting is hardest part". Computerworld. Vol. XXI, no. 44. CW Publishing, Inc. pp. 37, 45. ISSN 0010-4841. Archived from the original on 2020-01-11. Retrieved 2020-01-11.
  7. ^ a b c d e Wong, William G. (July 1984). "Digital Research's GSX: Graphics Portability". Microsystems. p. 74. GSX13ART.TXT. Archived from the original on 2019-10-20. Retrieved 2020-01-12.
  8. ^ "One man's drive to standardize GSX" (PDF). Digital Dialogue - Employee Newsletter of Digital Research Inc. Vol. 3, no. 4. Digital Research. August 1984. p. 3. Archived from the original (PDF) on 2015-06-16. Retrieved 2022-09-19.
  9. ^ a b "Language bindings available on data base services" (PDF). Micro Notes - Technical information on Digital Research products. Vol. 2, no. 3. Pacific Grove, California, USA: Digital Research, Inc. July 1984. p. 4. NWS-106-003. Archived (PDF) from the original on 2020-02-11. Retrieved 2020-02-11. […] Further documentation in the form of the GSX Language Reference manual is available for 16-bit DRI languages inside the GSX-86 Programmer's Toolkit. The product contains both versions of the newest GSX version 1.3 - one for CP/M-86 (including Concurrent CP/M) and the other for PC-DOS. […] [1]
  10. ^ a b c Elliott, John C., ed. (2014-07-07). "The Graphics System eXtension". Seasip.info. Retrieved 2020-01-13.
  11. ^ "New driver source". 2020. Archived from the original on 2020-07-28. Retrieved 2020-07-28.
  12. ^ "UMC UM85C408AF 16-bit ISA Dram VGA Drivers | Device Drivers". oemdrivers.com. 2020-07-27. Retrieved 2020-07-27.
  13. ^ a b "DRI promotes graphics standard" (PDF). Micro Notes - Technical information on Digital Research products. Vol. 2, no. 2. Pacific Grove, California, USA: Digital Research, Inc. May 1984. p. 12. NWS-106-002. Archived (PDF) from the original on 2020-02-11. Retrieved 2020-02-11. […] Polaroid Palette (part of the Presentation Master package from Digital Research), Diablo Cl30 Color InkJet printer, Transtar color printer, Houston Instruments CMP-29/40/41/42 plotter series. Strobe 100/260 plotter series, the Hewlett-Packard 7473A plotter and Philips GP 300L Hi and Lo Res printers. […] [2]
  14. ^ Lineback, Nathan. "GSX Screen Shots". Toastytech.com. Archived from the original on 2020-01-15. Retrieved 2020-01-15.
  15. ^ Elliott, John C., ed. (2014-07-07). "The Virtual Device Interface". Seasip.info. Retrieved 2020-01-13.
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  23. ^ Kisor, Henry (1985-11-16). "GEM Write Gives IBM Owners Apple-styled Word Processing". Orlando Sentinel. Archived from the original on 2019-02-13. Retrieved 2015-01-05.
  24. ^ a b Dilger, Daniel Eran (2007-09-10). "Office Wars 3 – How Microsoft Got Its Office Monopoly". RoughlyDrafted Magazine. San Francisco, California, USA. Archived from the original on 2013-08-19. Retrieved 2013-08-15.
  25. ^ "Digital Research To Modify GEM". The New York Times (National ed.). 1985-10-01. p. D-4. Archived from the original on 2018-09-30. Retrieved 2020-01-12.
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  27. ^ Watt, Peggy (1986-10-27). "Digital Research tighens belt with layoffs, reorganization - Realign business units, product lines". Computerworld - The Newsweekly for the Computer Community. Computer Industry. Vol. XX, no. 43. Monterey, California, USA: CW Communications, Inc. p. 95. ISSN 0010-4841. Archived from the original on 2020-02-16. Retrieved 2020-02-16.
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  30. ^ Alsop, Stewart II (1988-01-18). "WUI: The War Over User Interface" (PDF). P.C. Letter - the Insider's Guide to the Personal Computer Industry. 4 (2). PCW Communications Inc.: 1–4. ISSN 8756-7822. Archived (PDF) from the original on 2019-08-23. Retrieved 2020-01-11.
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  32. ^ a b Elliott, John C. (2013). "GEM/XM screenshots". Seasip.info. Archived from the original on 2018-09-12. Retrieved 2018-09-12.
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  34. ^ Harris, Dylan, ed. (2000). "download - XM". Digital Research. Retrieved 2001-09-12. GEM XM Desktop allows you to run several applications at once. You can switch at will between them and even pass data from application to application. No longer need you finish one job before starting another. No more errors in typing the output of one programme as input to the next. Even for DOS applications that were not specially written for GEM. These new capabilities are in addition to the easy–to–use GEM Desktop functions of organising and displaying the contents of your discs. All commands use drop–down menus so need no memorizing. Discs and files are represented by icons which are unambiguous and easy to select, especially with a mouse. GEM XM Desktop is delivered complete with the indispensable GEM Diary which has alarm clock, calendar, diary and card index functions constantly available.
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  37. ^ "Digital Research stellt Artline 2 vor - Unter GEM-Oberfläche illustrieren und präsentieren". Computerwoche (in German). Munich, Germany: IDG Business Media GmbH. 1990-02-09. ISSN 0170-5121. Archived from the original on 2020-01-12. Retrieved 2020-01-12.
  38. ^ Elliott, John C. (ed.). "Screenshots of GEM/4". Seasip.info. Archived from the original on 2019-06-10. Retrieved 2016-08-01.
  39. ^ a b Krautter, Thomas; Barnes, Chris J. (2006-06-14) [1999-12-29]. "GEM/4". GEM Development. Archived from the original on 2013-03-16. Retrieved 2020-01-12. […] In general, I like the idea of releasing Artline 1 and/or 2 to the public domain, given, some general things are discussed. […] comments on Artline, because the application all the time has been our own copyright, all code was written at CCP, the trademark has been Digital Research's (now it's ours) and the Artline 2 Operating System has been GEM/4. Artline 1 needs GEM 3.1, while all changes to GEM/4 have been made in cooperation with Lee Lorenzen and Don Heiskell to keep compatibility with ventura publisher. Bill Herndon is currently checking his archive to see, if he may contribute GEM/4 VDI and driver sources. […]
  40. ^ Digital Research Artline Installation / Startup (2 ed.). Digital Research / CCP Development GmbH. November 1990 [1988]. 5161-2052-002. Retrieved 2020-01-12.
  41. ^ Digital Research Artline Graphics Utilities Guide (1 ed.). Digital Research / CCP Development GmbH. August 1990 [1988]. 5161-2042-002. Retrieved 2020-01-12.
  42. ^ Artline Release Note (3 ed.). January 1991. 5161-1001-003. Archived from the original on 2020-01-12. Retrieved 2020-01-12. [3]
  43. ^ Elliott, John C. (ed.). "Screenshots of GEM/5". Seasip.info. Archived from the original on 2019-06-10. Retrieved 2016-08-01.
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  46. ^ "Motorola VME/10 Microcomputer System Overview Manual" (PDF) (1 ed.). Motorola Inc. February 1984. M68KVSOM/D1. Archived (PDF) from the original on 2019-11-27. Retrieved 2020-01-11.
  47. ^ "Archived copy". Archived from the original on 2006-07-13. Retrieved 2018-09-12.{{cite web}}: CS1 maint: archived copy as title (link)
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  50. ^ Leon, Mark (1996-07-29). "Caldera reopens 'settled' suit, buys DR DOS — Antitrust suit against Microsoft". InfoWorld. News. Vol. 18, no. 31. InfoWorld Publishing Co. p. 3. ISSN 0199-6649. Archived from the original on 2020-02-08. Retrieved 2020-02-08. [4]; Leon, Mark (1996-07-29). "Caldera reopens 'settled' suit, buys DR DOS — Microsoft's response: lawsuit is 'ironic and sad'". Computerworld New Zealand. IDG Communications. ISSN 0113-1494. CMPWNZ. Archived from the original on 2018-08-23. Retrieved 2018-02-13.
  51. ^ Morris, Joseph P., ed. (1997-05-23) [1997-05-19]. "Caldera Announces OEM Availability of "Web-TV"-like Functionality Using OpenDOS - Caldera WebSpyder Adds Customizable Inter/Intranet Functionality to OEM Solutions". Provo, Utah, USA: Caldera, Inc. Archived from the original on 2018-08-26. Retrieved 2018-08-26 – via www.delorie.com/opendos.
  52. ^ a b Jemmett, Ben A. L. (April 1999). "Caldera releases GEM under the GPL". Deltasoft - GEM News. Archived from the original on 2016-11-07. Retrieved 2016-11-07. Caldera Thin Clients, Inc. released the source code for GEM and ViewMAX under the GNU General Public License in mid April, following years of speculation over GEM's future. Caldera bought the GEM sources from Novell along with the DR-DOS in 1996, at the time noting that they may develop GEM into a platform for mobile computers and thin clients. However, these plans were dropped, and GEM was instead released into the open-source community.
  53. ^ Landemarre, Olivier; Rivière, Vincent; Méquignon, Didier; Reboux, Eric; Bercegeay, Arnaud; Béréziat, Dominique; Zorro; Donzé, Philipp; Lemaire, Jean Francois; Sevin, Roland; Stocklausen, Jean-Marc; Boudet, Frédéric; Mandin, Patrice, eds. (2017-12-10) [2011]. "MyAES". Release: 0.97. Archived from the original on 2019-11-02. Retrieved 2020-01-11.
  54. ^ a b Paul, Matthias R. (1997-04-13) [1993]. DRDOS6UN.TXT — Zusammenfassung der dokumentierten und undokumentierten Fähigkeiten von DR DOS 6.0. MPDOSTIP (in German) (60 ed.). Archived from the original on 2016-11-07. Retrieved 2016-11-07.
  55. ^ a b Paul, Matthias R. (1997-06-07) [1994]. NWDOS7UN.TXT — Zusammenfassung der dokumentierten und undokumentierten Fähigkeiten von Novell DOS 7. MPDOSTIP (in German) (85 ed.). Archived from the original on 2016-11-07. Retrieved 2016-11-07.

Further reading

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