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On August 19, 2016, Michael Steil posted in his blog that the source code for GEOS 2.0 for
Commodore C64 had been fully reverse-engineered and suitable for the cc65 compiler suite. The reverse-engineered source code has been made available at
46:
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bundled GEOS with its redesigned and cost-reduced C64, the C64C. At its peak, GEOS was the third-most-popular microcomputer operating system in the world in terms of units shipped, trailing only
350:, the GEOS Design Team: Jim DeFrisco, Dave Durran, Michael Farr, Doug Fults, Chris Hawley, Clayton Jung, and Tony Requist, led by Dougherty, who cut their teeth on limited-resource
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Dozens of official and third-party applications and other products were produced for GEOS. Among the most important and popular were the following:
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Other GEOS-compatible software packages were available from
Berkeley Softworks or from third parties, including a reasonably sophisticated
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for the C64 and C128, GEOS takes full advantage of many of the add-ons and improvements available for these systems. Commodore's
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450:. This ability to print to high-end printers was a major factor in making GEOS a desktop publishing platform.
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The
Official GEOS Programmer's Reference Guide. For Commodore 64/64C/128. Includes versions 1.0, 1.1, and 1.2
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application called geoPublish and a spreadsheet called geoCalc. While geoPublish is not as sophisticated as
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with its version being released in 1986, enhanced versions of GEOS later became available in 1987 for the
128:
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Via
Berkeley's special geoCable interface converter or other third-party interfaces to connect standard
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scheme that renders users' disks unbootable if it detects that the disk has been illegally duplicated.
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package for PCs. Related code found its way to earlier "Zoomer" PDAs, creating an unclear lineage to
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This article is about the GEOS home computer operating system. For the PC/x86 based system, see
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766:, Printed: October 1986, Berkeley Softworks, 2150 Shattuck Avenue, Berkeley, California 94704
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printers to the
Commodore serial bus, GEOS supports a wide variety of printers, including
416:. GEOS 128 can take advantage of the C128's enhanced "burst mode" in conjunction with the
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358:, GEOS was revered for what it could accomplish on machines with 64–128
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943:
GEOS Inside and Out: An introduction to GEOS, its applications and internals
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1988: GEOS for Apple II, GEOS V2.0 for
Commodore C64, GEOS V2.1 for Apple II
927:
901:
243:
161:
51:
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GitHub - mist64/geos: Source code of GEOS 2.0 for the
Commodore 64 and 128
54:. Mimicking Commodore's own OS core naming, Berkeley called GEOS' core a "
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in August 2003. The
Commodore 64/128 versions followed in February 2004.
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477:
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409:
408:. GEOS is the first Commodore software that could use a floppy disk as
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404:, that significantly increases the speed of drive access on the slow
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385:. GEOS 128 also fully supports the C128's 640×200 high-resolution
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839:"Reverse-Engineered GEOS 2.0 for C64 Source Code – pagetable.com"
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found that nearly half of respondents used GEOS. For many years,
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1987: GEOS for
Commodore C128, Commodore Plus/4 (unofficial)
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A December 1987 survey by the
Commodore-dedicated magazine
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The latest GEOS desktop suite for IBM PC compatibles is
309:, the packages provide reasonable functionality, and
508:
Floppy disk containing GEOS for Commodore 64C (1986)
254:. A lesser-known version was also released for the
986:Home of the GEOS operating system (down, archived
941:Tornsdorf, Manfred; Kerkoh, Rüdiger (1 May 1988).
542:
1007:
396:The C64 version of GEOS incorporates a built-in
321:on Commodore 8-bit computers for several years.
290:and Mac OS (besides the original Commodore 64's
940:
484:used GEOS as a base operating system for their
529:
805:"GUIdebook > Timelines > GEOS/GeoWorks"
453:The Apple II version of GEOS was released as
424:drives. The Commodore version of GEOS uses a
261:GEOS closely resembles early versions of the
856:
777:"GEOS: A Whole New World for your Commodore"
862:
472:GeoBook line of laptop-appliances, and the
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381:is supported by GEOS, as are its various
1002:A lengthy review of GEOS and its history
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554:
546:
503:
334:
1008:
945:(2nd ed.). Abacus Software Inc.
346:Written by a group of programmers at
317:claimed the company ran its business
1000:GEOS: The Graphical Operating System
893:
716:
305:and geoCalc not as sophisticated as
13:
894:Farr, Michael (15 February 1987).
886:
704:"GEOS Drean Commodore version 1.2"
522:1989: GEOS V2.0 for Commodore C128
389:display mode through a compatible
14:
1062:
977:
666:List of computer system emulators
525:2022: GEOS for Atari (unofficial)
499:
342:, founder of Berkeley Softworks.
44:
35:
16:8-bit graphical operating system
845:
757:GEOS User's Manual, Version 1.2
567:which was painted with geoPaint
242:). Originally designed for the
1051:Window-based operating systems
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661:GEOS (16-bit operating system)
543:GEOS products and applications
324:
21:GEOS (16-bit operating system)
1:
1046:Proprietary operating systems
994:The Commodore GEOS FAQ v1.5.0
676:
727:. Vol. 6, no. 59.
488:series, before switching to
464:. Revivals were seen in the
7:
649:
530:Reverse engineering efforts
513:1986: GEOS for Commodore 64
370:of 8-bit processing power.
115:; 38 years ago
10:
1067:
717:Elko, Lance (1 May 1988).
328:
18:
1041:Graphical user interfaces
1021:Operating system families
671:List of operating systems
265:and includes a graphical
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157:
137:
127:
109:
101:
89:
71:
43:
34:
990:at the Internet Archive)
863:Guerra, Bob (May 1989).
791:"Info magazine Issue 14"
189:Graphical user interface
1031:Commodore 128 software
900:. Berkeley Softworks.
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568:
552:
509:
373:Unlike many pieces of
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319:using its own software
105:Discontinued, historic
1036:Commodore 64 software
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558:
550:
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338:
690:"GEOS en castellano"
375:proprietary software
366:memory and 1–2
250:and in 1988 for the
230:) is a discontinued
201:Proprietary software
819:"Ytmytm/Geos-atari"
575:geoWrite screenshot
559:A HiRes graphic of
551:geoPaint screenshot
383:RAM expansion units
352:video game machines
31:
996:– By Bo Zimmermann
762:2015-09-23 at the
724:Compute!'s Gazette
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569:
553:
510:
486:Nokia Communicator
348:Berkeley Softworks
344:
340:Brian P. Dougherty
331:Berkeley Softworks
311:Berkeley Softworks
299:desktop publishing
279:Compute!'s Gazette
236:Berkeley Softworks
78:Berkeley Softworks
29:
1026:Apple II software
633:geoWrite Workshop
462:Breadbox Ensemble
448:Apple LaserWriter
446:printers and the
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96:Assembly language
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932:Internet Archive
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719:"Editor's Notes"
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256:Commodore Plus/4
232:operating system
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887:Further reading
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764:Wayback Machine
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480:'s later work.
426:copy protection
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315:Brian Dougherty
307:Microsoft Excel
303:Aldus Pagemaker
269:(geoWrite) and
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110:Initial release
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978:External links
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474:NewDeal Office
414:virtual memory
329:Main article:
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267:word processor
263:classic Mac OS
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184:user interface
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129:Latest release
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1016:1986 software
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619:geoProgrammer
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500:GEOS versions
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271:paint program
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248:Commodore 128
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102:Working state
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50:GEOS for the
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42:
38:
33:
22:
942:
930:– via
902:Bantam Books
896:
873:. Retrieved
871:. p. 78
868:
858:
847:
833:
822:
813:
799:
785:
771:
752:
742:– via
736:. Retrieved
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712:
698:
684:
578:
533:
459:
452:
430:
401:
395:
372:
354:such as the
345:
296:
277:
275:
273:(geoPaint).
260:
244:Commodore 64
225:
221:
217:
213:
212:
208:
207:
162:Commodore 64
139:Available in
63:
59:
52:Commodore 64
875:11 November
865:"Writer 64"
738:11 February
641:Writer 64 (
468:handhelds,
398:fast loader
325:Development
220:nvironment
1010:Categories
677:References
623:geoPublish
478:Palm, Inc.
437:Centronics
410:swap space
379:1351 mouse
356:Atari 2600
91:Written in
969:11434890M
733:0737-3716
643:Timeworks
565:Nordertor
561:Flensburg
402:diskTurbo
400:, called
393:monitor.
284:Commodore
224:perating
158:Platforms
73:Developer
984:Breadbox
961:18446175
928:7825792M
920:16684486
869:Compute!
760:Archived
650:See also
630:geoWrite
627:geoSpell
616:geoPrint
613:geoPaint
610:geoLabel
592:geoChart
586:geoCable
583:geoBASIC
455:freeware
313:founder
252:Apple II
240:GeoWorks
176:, MEGA65
174:Apple II
133:GEOS 2.0
83:GeoWorks
793:. 1987.
656:Contiki
607:geoFont
604:geoFile
598:geoDraw
589:geoCalc
494:Symbian
470:Brother
238:(later
216:raphic
196:License
182:Default
152:Spanish
144:English
118: (
81:(later
967:
959:
949:
926:
918:
908:
824:GitHub
731:
637:geoRAM
601:geoFAX
595:geoDex
537:GitHub
466:OmniGo
433:RS-232
292:KERNAL
288:MS-DOS
170:Plus/4
148:German
62:. kern
56:kernal
482:Nokia
234:from
228:ystem
988:here
957:OCLC
947:ISBN
916:OCLC
906:ISBN
877:2013
740:2021
729:ISSN
490:EPOC
422:1581
420:and
418:1571
406:1541
209:GEOS
150:and
120:1986
113:1986
30:GEOS
563:'s
496:).
444:PCL
435:or
412:or
391:RGB
387:VDC
368:MHz
364:RAM
362:of
294:).
66:l).
58:" (
1012::
965:OL
963:.
955:.
924:OL
922:.
914:.
904:.
867:.
821:.
721:.
539:.
441:HP
360:kB
258:.
172:,
168:,
164:,
146:,
60:cf
971:.
934:.
879:.
841:.
827:.
807:.
779:.
746:.
706:.
692:.
645:)
492:(
226:S
222:O
218:E
214:G
211:(
122:)
85:)
64:e
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
