Editing Bootloader (section)

==References==
{{reflist|refs=
<ref name="Duncan_1988_MS-DOS_Encyclopedia">{{Cite book |title=The MS-DOS Encyclopedia: versions 1.0 through 3.2 |author-first1=Ray |author-last1=Duncan |author-first2=Steve |author-last2=Bostwick |author-first3=Keith |author-last3=Burgoyne |author-first4=Robert A. |author-last4=Byers |author-first5=Thom |author-last5=Hogan |author-first6=Jim |author-last6=Kyle |author-first7=Gordon |author-last7=Letwin |author-link7=Gordon Letwin |author-first8=Charles |author-last8=Petzold |author-link8=Charles Petzold |author-first9=Chip |author-last9=Rabinowitz |author-first10=Jim |author-last10=Tomlin |author-first11=Richard |author-last11=Wilton |author-first12=Van |author-last12=Wolverton |author-first13=William |author-last13=Wong |author-first14=JoAnne |author-last14=Woodcock |contribution=Technical advisors |contributor-first1=Mark |contributor-last1=Zbikowski |contributor-link1=Mark Zbikowski |contributor-first2=Paul |contributor-last2=Allen |contributor-link2=Paul Allen |contributor-first3=Steve |contributor-last3=Ballmer |contributor-link3=Steve Ballmer |contributor-first4=Reuben |contributor-last4=Borman |contributor-first5=Rob |contributor-last5=Borman |contributor-first6=John |contributor-last6=Butler |contributor-first7=Chuck |contributor-last7=Carroll |contributor-first8=Mark |contributor-last8=Chamberlain |contributor-first9=David |contributor-last9=Chell |contributor-first10=Mike |contributor-last10=Colee |contributor-first11=Mike |contributor-last11=Courtney |contributor-first12=Mike |contributor-last12=Dryfoos |contributor-first13=Rachel |contributor-last13=Duncan |contributor-first14=Kurt |contributor-last14=Eckhardt |contributor-first15=Eric |contributor-last15=Evans |contributor-first16=Rick |contributor-last16=Farmer |contributor-first17=Bill |contributor-last17=Gates |contributor-link17=Bill Gates |contributor-first18=Michael |contributor-last18=Geary |contributor-first19=Bob |contributor-last19=Griffin |contributor-first20=Doug |contributor-last20=Hogarth |contributor-first21=James W. |contributor-last21=Johnson |contributor-first22=Kaamel |contributor-last22=Kermaani |contributor-first23=Adrian |contributor-last23=King |contributor-first24=Reed |contributor-last24=Koch |contributor-first25=James |contributor-last25=Landowski |contributor-first26=Chris |contributor-last26=Larson |contributor-first27=Thomas |contributor-last27=Lennon |contributor-first28=Dan |contributor-last28=Lipkie |contributor-first29=Marc |contributor-last29=McDonald |contributor-link29=Marc McDonald |contributor-first30=Bruce |contributor-last30=McKinney |contributor-first31=Pascal |contributor-last31=Martin |contributor-first32=Estelle |contributor-last32=Mathers |contributor-first33=Bob |contributor-last33=Matthews <!-- |contributor-link33=Robert Matthews (scientist)??? --> |contributor-first34=David |contributor-last34=Melin |contributor-first35=Charles |contributor-last35=Mergentime |contributor-first36=Randy |contributor-last36=Nevin |contributor-first37=Dan |contributor-last37=Newell |contributor-first38=Tani |contributor-last38=Newell |contributor-first39=David |contributor-last39=Norris |contributor-first40=Mike |contributor-last40=O'Leary |contributor-first41=Bob |contributor-last41=O'Rear |contributor-link41=Bob O'Rear |contributor-first42=Mike |contributor-last42=Olsson |contributor-first43=Larry |contributor-last43=Osterman |contributor-first44=Ridge |contributor-last44=Ostling |contributor-first45=Sunil |contributor-last45=Pai |contributor-first46=Tim |contributor-last46=Paterson |contributor-link46=Tim Paterson |contributor-first47=Gary |contributor-last47=Perez |contributor-first48=Chris |contributor-last48=Peters |contributor-first49=Charles |contributor-last49=Petzold |contributor-link49=Charles Petzold |contributor-first50=John |contributor-last50=Pollock |contributor-first51=Aaron |contributor-last51=Reynolds |contributor-first52=Darryl |contributor-last52=Rubin |contributor-first53=Ralph |contributor-last53=Ryan |contributor-first54=Karl |contributor-last54=Schulmeisters |contributor-first55=Rajen |contributor-last55=Shah |contributor-first56=Barry |contributor-last56=Shaw |contributor-first57=Anthony |contributor-last57=Short |contributor-first58=Ben |contributor-last58=Slivka |contributor-first59=Jon |contributor-last59=Smirl |contributor-first60=Betty |contributor-last60=Stillmaker |contributor-first61=John |contributor-last61=Stoddard |contributor-first62=Dennis |contributor-last62=Tillman |contributor-first63=Greg |contributor-last63=Whitten |contributor-first64=Natalie |contributor-last64=Yount |contributor-first65=Steve |contributor-last65=Zeck |date=1988 |edition=Completely reworked |publisher=[[Microsoft Press]] |location=Redmond, Washington, USA |isbn=1-55615-049-0 |lccn=87-21452 |oclc=16581341}} (xix+1570 pages; 26&nbsp;cm) (NB. This edition was published in 1988 after extensive rework of the withdrawn 1986 first edition by a different team of authors. [https://www.pcjs.org/pubs/pc/reference/microsoft/mspl13/msdos/encyclopedia/])</ref>
<ref name="Chappell_1994_DOS-Internals">{{cite book |title=DOS Internals |author-first=Geoff |author-last=Chappell |chapter=Chapter 2: The system footprint |editor-first1=Andrew |editor-last1=Schulman |editor-first2=Amorette |editor-last2=Pedersen |date=January 1994 |edition=1st printing, 1st |series=The Andrew Schulman programming series |publisher=[[Addison-Wesley]] |isbn=978-0-201-60835-9 }} (xxvi+738+iv pages, 3.5"-floppy [https://web.archive.org/web/20190421200111/https://gopher.tildeverse.org/gopher.viste.fr/9/programming/PC/DOS/DOS%2520Internals/DOS_Internals.zip][https://web.archive.org/web/20200222111608/https://www.pcjs.org/pubs/pc/programming/DOS_Internals/]) Errata: [https://web.archive.org/web/20200222111742/http://www.geoffchappell.com/notes/dos/internals/][https://web.archive.org/web/20200222111853/https://gopher.tildeverse.org/gopher.viste.fr/1/programming/PC/DOS/DOS%2520Internals/crtdrvr][https://web.archive.org/web/20200222111945/https://gopher.tildeverse.org/gopher.viste.fr/1/programming/PC/DOS/DOS%2520Internals/xmswatch]</ref>
<ref name="Rosch_1991_SYS">{{cite magazine|title=DR DOS 5.0 - The better operating system?|author-first=Winn L.|author-last=Rosch|magazine=[[PC Magazine]]|date=12 February 1991|volume=10|number=3|pages=<!-- 245, -->241–246, 257, 264, 266|url=https://books.google.com/books?id=YxFTezF9-sMC&pg=PT250|access-date=26 July 2019|url-status=live|archive-url=https://archive.today/20190725223320/https://books.google.nl/books?id=YxFTezF9-sMC&pg=PT250&lpg=PT250&redir_esc=y%23v=onepage&q&f=false|archive-date=25 July 2019|quote=[…] <code>[[SYS (command)|SYS]]</code> has been improved under [[DR-DOS#DR DOS 5.0|DR&nbsp;DOS 5.0]] so you don't have to worry about leaving the first cluster free on a disk that you want to make bootable. The DR&nbsp;DOS system files can be located anywhere on the disk, so any disk with enough free space can be set to boot your system. […] }} (NB. The source attributes this to the <code>SYS</code> utility while in fact this is a feature of the advanced bootstrap loader in the boot sector. <code>SYS</code> just plants this sector onto the disk.)</ref>
<ref name="Paul_1997_OD-A3">{{anchor|Paul_1997_ODA3}}{{cite web|author-first=Matthias R.|author-last=Paul|title=Caldera OpenDOS 7.01/7.02 Update Alpha 3 IBMBIO.COM - README.TXT and BOOT.TXT - A short description of how OpenDOS is booted|url=http://www.uni-bonn.de/~uzs180/download/ibmbioa3.zip|date=2 October 1997|orig-year=29 September 1997|access-date=29 March 2009|url-status=dead|archive-url=https://web.archive.org/web/20031004074600/http://www-student.informatik.uni-bonn.de/~frinke/ibmbioa3.zip|archive-date=4 October 2003}} [https://web.archive.org/web/20181225154705/http://mirror.macintosharchive.org/max1zzz.co.uk/+Windows%20&%20DOS/DOS/System/Novell/Support/Bins/Op702src.zip<!-- Op702src.zip is an unofficial renamed distribution of the ibmbioa3.zip file -->]</ref>
<ref name="Paul_2001">{{cite web|title=FAT32 in DR-DOS|author-first=Matthias R.|author-last=Paul|date=17 January 2001|work=opendos@delorie|url=http://www.delorie.com/opendos/archives/browse.cgi?p=opendos/2001/01/17/02:29:47|access-date=6 October 2017|url-status=live|archive-url=https://web.archive.org/web/20171006205537/http://www.delorie.com/opendos/archives/browse.cgi?p=opendos%2F2001%2F01%2F17%2F02%3A29%3A47|archive-date=6 October 2017|quote=[…] The [[DR-DOS]] boot sector […] searches for the <code>[[IBMBIO.COM]]</code> ([[DRBIOS.SYS]]) file and then loads the *whole* file into memory before it passes control to it. […]}}</ref>
<ref name="Paul_2002">{{cite web|title=Can't copy|author-first=Matthias R.|author-last=Paul|date=20 February 2002|work=opendos@delorie|url=http://www.delorie.com/opendos//archives/browse.cgi?p=opendos/2002/02/20/16:17:57|access-date=9 October 2017|url-status=live|archive-url=https://web.archive.org/web/20171006211007/http://www.delorie.com/opendos//archives/browse.cgi?p=opendos%2F2002%2F02%2F20%2F16%3A17%3A57|archive-date=6 October 2017|quote=[…] The [[DR-DOS]] boot sector loads the whole <code>[[IBMBIO.COM]]</code> file into memory before it executes it. It does not care at all about the <code>[[IBMDOS.COM]]</code> file, which is loaded by <code>IBMBIO.COM</code>. […] The DR-DOS boot sector […] will find the […] kernel files as long as they are logically stored in the root directory. Their physical location on the disk, and if they are fragmented or not, is don't care for the DR-DOS boot sector. Hence, you can just copy the kernel files to the disk (even with a simply <code>[[copy (command)|COPY]]</code>), and as soon as the boot sector is a DR-DOS sector, it will find and load them. Of course, it is difficult to put all this into just 512 bytes, the size of a single sector, but this is a major convenience improvement if you have to set up a DR-DOS system, and it is also the key for the DR-DOS multi-OS [[Master boot record#NEWLDR|LOADER]] utility to work. The [[MS-DOS]] kernel files must reside on specific locations, but the DR-DOS files can be anywhere, so you don't have to physically swap them around each time you boot the other OS. Also, it allows to upgrade a DR-DOS system simply by copying the kernel files over the old ones, no need for <code>[[SYS (command)|SYS]]</code>, no difficult setup procedures as required for MS-DOS/[[IBM PC DOS|PC&nbsp;DOS]]. You can even have multiple DR-DOS kernel files under different file names stored on the same drive, and LOADER will switch between them according to the file names listed in the [[DR-DOS|BOOT.LST]] file. […]}}</ref>
<ref name="Paul_2017">{{cite web|title=The continuing saga of Windows 3.1 in enhanced mode on OmniBook 300|author-first=Matthias R.|author-last=Paul|orig-year=7 August 2017|date=14 August 2017|work=MoHPC - the museum of HP calculators|url=http://hpmuseum.org/forum/thread-8774-post-76925.html#pid76925|access-date=6 October 2017|url-status=live|archive-url=https://web.archive.org/web/20171006204718/http://hpmuseum.org/forum/thread-8774-post-76925.html|archive-date=6 October 2017|quote=[…] the [[DR-DOS]] <code>[[fdisk|FDISK]]</code> does not only partition a disk, but can also format the freshly created volumes and initialize their boot sectors in one go, so there's no risk to accidentally mess up the wrong volume and no need for <code>[[format (command)|FORMAT]] /S</code> or <code>[[SYS (command)|SYS]]</code>. Afterwards, you could just copy over the remaining DR-DOS files, including the system files. It is important to know that, in contrast to [[MS-DOS]]/[[IBM PC DOS|PC&nbsp;DOS]], DR-DOS has "smart" boot sectors which will actually "mount" the file-system to search for and load the system files in the root directory instead of expecting them to be placed at a certain location. Physically, the system files can be located anywhere and also can be fragmented. […]}}</ref>
}}