245:
80:
calculation errors caused by some of their formatter software under earlier issues of these systems. While this undocumented behaviour allows them to cope with these incorrectly formatted volumes specifically, it limits the flexibility of disk geometries they can work with in general and can cause
38:
and unintended behaviour. That must also be preserved by the newer replacement. Besides the significantly higher complexity that needs to be maintained during the natural evolution of the code or interface, it can sometimes cause performance or security issues, and the inconsistencies in the
132:(CDS) internally), but also actual bugs in the kernel and several drivers, in order to make certain other drivers and applications run on DR-DOS, when they were tested on specific versions of MS-DOS only.
666:
112:
also had to be modified to not only emulate many undocumented peculiarities and undesirable properties of MS-DOS and PC DOS (like having to use certain misleading filenames such as
781:(NB. NWDOSTIP.TXT is a comprehensive work on Novell DOS 7 and OpenDOS 7.01, including the description of many undocumented features and internals. It is part of the author's yet larger
335:), but could not be done later on in order to remain compatible with various tools expecting these particular filenames. To eliminate the risk of crashes, these files were changed into
39:
behaviour of interfaces can sometimes lead to new bugs in the software using it, creating difficult to resolve multi-directional cross dependencies between various pieces of code.
852:
476:
93:
contains code specially designed to detect and fix certain widespread applications and stub loaders (such as programs linked with older versions of
Microsoft's
511:
638:
813:
636:
581:
615:
Undocumented DOS: A programmer's guide to reserved MS-DOS functions and data structures - expanded to include MS-DOS 6, Novell DOS and
Windows 3.1
536:
677:
101:' 386 DOS extenders) by patching the loaded program image before executing it. Under certain conditions an underlying DOS also patches Windows (
785:
collection maintained up to 2001 and distributed on many sites at the time. The provided link points to a HTML-converted older version of the
650:
769:
741:
373:
Same as bug-compatible, with the additional implication that much tedious effort went into ensuring that each (known) bug was replicated.
924:
181:'s chips", forcing them to make their computer bug-compatible with the IBM PC. Another hardware example is found in the design of the
147:, which makes it possible to run many Windows applications on other platforms, also needs to maintain bug compatibility with Windows.
882:
713:
628:
439:
556:
143:, which has traditionally emulated many old system bugs to allow older low-level programs to run, is another example. As a result,
996:
829:
and the non-obvious design constraints to be observed when developing resident system extensions to be loaded into the HMA.)
790:
34:
with an older system is that such systems' client programs often do not only depend on their specified interfaces but also
453:(NB. The author mentions that DOS 4.0 checks the OEM label, but denies that DOS 3.2 checks it as well (although it does).)
948:
765:
NWDOS-TIPs — Tips & Tricks rund um Novell DOS 7, mit Blick auf undokumentierte
Details, Bugs und Workarounds
129:
840:
464:
165:
503:
182:
961:
805:
81:
them to trash validly formatted volumes created by third-parties if they deviate from the defaults used by
991:
31:
573:
544:
687:
76:(BPB) values and recalculate them from other disk geometry parameters in order to work around several
73:
848:
808:[Loading drivers dynamically (Intra-segment offset relocation to load TSRs into the HMA)].
737:
NWDOS7UN.TXT — Zusammenfassung der dokumentierten und undokumentierten Fähigkeiten von Novell DOS 7
472:
213:
212:, talks about this problem that he observed firsthand while working on C++ core libraries. It was
205:
23:
if it exactly replicates an undesirable feature of a previous version. The phrase is found in the
250:
198:, which falsely treats 29 February 1900 as an actual date, to ensure backward compatibility with
121:
90:
874:
763:
735:
364:
102:
89:. When MS-DOS/PC DOS 5.0 and higher are running on 286 or higher processors, the resident
624:
435:
156:
140:
806:"Treiber dynamisch nachladen (Intra-Segment-Offset-Relokation zum Laden von TSRs in die HMA)"
406:
844:
826:
468:
124:
for files which do not follow the specs for executables under DOS, or having to introduce a
98:
709:
308:
programs would result in the system to crash. This is the reason why these files have the
301:
263:
191:
144:
385:
875:"Re: [fd-dev] On GRAFTABL and DISPLAY.SYS (Was: Changing codepages in FreeDOS)"
654:
620:
613:
324:
312:
217:
125:
244:
985:
683:
608:
429:
195:
174:
69:
35:
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and higher now including tiny stubs to exit gracefully when invoked inappropriately.
268:
224:
233:. It was a mistake in the original web proposal, and was kept for compatibility.
216:, also an engineer at Google, who popularized this concept on a larger scale as "
340:
305:
199:
24:
336:
332:
328:
297:
293:
240:
117:
113:
77:
61:
258:
229:
82:
304:. Accidentally trying to run them from the prompt as if they were normal
185:
170:
903:
825:(NB. Gives a comprehensive overview on the history and "nature" of the
94:
320:
316:
209:
160:
109:
57:
53:
734:
Paul, Matthias R. (1997-06-07) . "Chapter 1.3.xi: Überlange Pfade".
679:
DR-DOS 7.03 WHATSNEW.TXT - Changes from DR-DOS 7.02 to DR-DOS 7.03
178:
651:"Caldera OpenDOS 7.01/7.02 Update Alpha 3 IBMBIO.COM README.TXT"
602:
600:
598:
65:
273:
86:
841:"Fix for CauseWay DOS extender under DR-DOS 7.0x EMM386.EXE"
949:
Excel incorrectly assumes that the year 1900 is a leap year
925:"Bruce Artwick / The Designer Behind Flight Simulator II"
431:
Programmer's
Technical Reference for MSDOS and the IBM PC
611:; Maxey, David; Michels, Raymond J.; Kyle, Jim (1994) .
60:: When MS-DOS/PC DOS 3.1 and higher (including
612:
323:. This could have been avoided by choosing other
799:
797:
567:
565:
563:
962:"Software Engineering at Google [Book]"
530:
528:
497:
495:
493:
188:to emulate the behaviour in older processors.
8:
19:Computer hardware or software is said to be
300:files are special binary images containing
635:(xviii+856+vi pages, 3.5"-floppy) Errata:
407:"Windows 95's third delay; needs polish"
904:"WineFeatures - The Official Wine Wiki"
356:
285:
619:(2 ed.). Reading, Massachusetts:
417:(52). InfoWorld Media Group, Inc.: 18.
768:. MPDOSTIP (in German) (3 ed.).
574:"Re: masm .com (PSP) related trouble"
7:
712:(COUNTRY.LST file) (1.44 ed.).
14:
762:Paul, Matthias R. (1997-07-30) .
708:Paul, Matthias R. (2001-06-10) .
386:"Bug-compatible - www.jargon.net"
873:Paul, Matthias R. (2001-08-18).
839:Paul, Matthias R. (2002-04-01).
804:Paul, Matthias R. (2002-02-02).
649:Paul, Matthias R. (1997-10-02).
572:Paul, Matthias R. (2002-10-07).
535:Paul, Matthias R. (2004-08-25).
502:Paul, Matthias R. (2002-02-20).
243:
108:Over the course of development,
885:from the original on 2017-09-04
855:from the original on 2018-09-19
816:from the original on 2017-09-09
772:from the original on 2017-09-10
744:from the original on 2016-11-07
716:from the original on 2016-04-20
584:from the original on 2017-09-03
514:from the original on 2017-09-09
479:from the original on 2017-09-09
177:described as "a bug in one of
169:would not run because of what
1:
923:Yakal, Kathy (January 1985).
710:"DOS COUNTRY.SYS file format"
428:Williams, Dave (1992-01-12).
227:is a misspelling of the word
405:Pontin, Jason (1994-12-26).
194:has always had a deliberate
130:Current Directory Structure
1013:
686:1998-12-24. Archived from
463:Bass, Wally (1994-02-14).
166:Microsoft Flight Simulator
155:During development of its
504:"Need DOS 6.22 (Not OEM)"
72:, they do not trust some
52:Examples can be found in
30:An aspect of maintaining
849:comp.os.msdos.programmer
740:. MPDOSTIP (in German).
473:comp.os.msdos.programmer
365:"bug-for-bug compatible"
183:IBM Personal Computer/AT
951:. Retrieved 2019-05-01.
997:Backward compatibility
32:backward compatibility
163:engineers found that
508:alt.msdos.programmer
74:BIOS Parameter Block
225:HTTP referer header
929:Compute!'s Gazette
607:Schulman, Andrew;
251:Engineering portal
208:, an engineer at
157:IBM PC compatible
91:executable loader
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653:. Archived from
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543:. Archived from
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186:A20 address line
99:Rational Systems
16:Programming term
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966:www.oreilly.com
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325:file extensions
302:executable code
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264:Plug compatible
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192:Microsoft Excel
153:
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128:length-limited
68:detect certain
50:
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17:
12:
11:
5:
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621:Addison Wesley
609:Brown, Ralf D.
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537:"NOVOLTRK.REG"
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489:
465:"Cluster Size"
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126:directory path
70:FAT OEM labels
49:
46:
44:
41:
21:bug compatible
15:
13:
10:
9:
6:
4:
3:
2:
1009:
998:
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992:Software bugs
990:
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812:(in German).
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766:
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743:
739:
738:
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704:
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690:on 2019-04-08
689:
685:
684:Caldera, Inc.
681:
680:
673:
670:
667:
657:on 2003-10-04
656:
652:
645:
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639:
637:
632:
630:0-201-63287-X
626:
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579:
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566:
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547:on 2016-03-04
546:
542:
541:www.drdos.org
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441:1-878830-02-3
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214:Titus Winters
211:
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203:
201:
197:
196:leap year bug
193:
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184:
180:
176:
175:Bruce Artwick
172:
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969:. Retrieved
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944:
933:. Retrieved
931:. p. 32
928:
918:
907:. Retrieved
898:
887:. Retrieved
878:
868:
857:. Retrieved
834:
818:. Retrieved
809:
787:NWDOSTIP.TXT
783:MPDOSTIP.ZIP
774:. Retrieved
764:
757:
746:. Retrieved
736:
729:
718:. Retrieved
703:
692:. Retrieved
688:the original
678:
672:
659:. Retrieved
655:the original
644:
614:
586:. Retrieved
578:alt.lang.asm
577:
549:. Retrieved
545:the original
540:
516:. Retrieved
507:
481:. Retrieved
458:
446:. Retrieved
430:
423:
414:
410:
400:
389:. Retrieved
380:
372:
368:
359:
337:fat binaries
309:
288:
269:Software bug
228:
222:
206:Hyrum Wright
204:
190:
164:
154:
139:
107:
51:
29:
20:
18:
879:freedos-dev
341:DR-DOS 7.02
327:(like with
218:Hyrum's Law
200:Lotus 1-2-3
122:COUNTRY.SYS
58:PC DOS
25:Jargon File
986:Categories
971:2022-05-31
935:2014-07-06
909:2010-02-03
889:2017-09-04
859:2018-09-19
820:2017-07-02
776:2014-08-06
748:2016-11-07
720:2016-08-20
694:2019-04-08
661:2009-03-29
588:2017-09-03
551:2011-12-17
518:2006-10-14
483:2006-10-14
448:2012-01-08
391:2010-02-03
351:References
333:DRBDOS.SYS
329:DRBIOS.SYS
315:set under
298:IBMDOS.COM
294:IBMBIO.COM
118:IBMDOS.COM
114:IBMBIO.COM
103:WINA20.386
78:off-by-one
62:Windows 9x
845:Newsgroup
469:Newsgroup
411:InfoWorld
313:attribute
306:COM-style
259:AARD code
83:Microsoft
883:Archived
853:Archived
814:Archived
770:Archived
742:Archived
714:Archived
582:Archived
512:Archived
477:Archived
444:. DOSREF
369:catb.org
237:See also
230:referrer
171:subLOGIC
43:Examples
847::
789:file.)
471::
141:Windows
136:Windows
95:EXEPACK
627:
438:
321:PC DOS
317:MS-DOS
310:hidden
210:Google
161:Compaq
110:DR-DOS
64:) and
54:MS-DOS
339:with
280:Notes
179:Intel
151:Other
625:ISBN
436:ISBN
331:and
296:and
292:The
223:The
145:Wine
85:and
66:OS/2
36:bugs
827:HMA
274:API
220:".
173:'s
120:or
105:).
97:or
87:IBM
48:DOS
988::
964:.
927:.
881:.
877:.
851:.
843:.
796:^
682:.
623:.
597:^
580:.
576:.
562:^
539:.
527:^
510:.
506:.
492:^
475:.
467:.
434:.
415:16
413:.
409:.
371:.
367:.
202:.
159:,
116:,
27:.
974:.
938:.
912:.
892:.
862:.
823:.
779:.
751:.
723:.
697:.
664:.
633:.
591:.
554:.
521:.
486:.
451:.
394:.
319:/
56:/
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.