BTC DR DOS VERSION 5.0 OPERATIVSYSTEM FÖR IBM PC DATORER - Digital Research Utgåva (Engelsk)

Sällsynt operativsystem för PC datorer "DR DOS version 5.0 - Engelsk" på tre stycken disketter med serie nummer.

Disketterna är i mycket fint skick.

Vintage and rare to find PC operative system "DR DOS version 5.0 - English" the software is stored on three floppy disks including serial number.

The floppy diskettes is in very good condition.

ABOUT THE SOFTWARE

DR-DOS (DR DOS, without hyphen up to and including version 6.0) is an operating system of the DOS family, written for IBM PC-compatible personal computers. It was originally developed by Gary Kildall's Digital Research and derived from Concurrent PC DOS 6.0, which was an advanced successor of CP/M-86. As ownership changed, various later versions were produced with names including Novell DOS and Caldera OpenDOS.

First, the DR DOS kernel and structures such as disk buffers can be located in the High Memory Area (HMA), the first 64 KB of extended memory which are accessible in real mode due to an incomplete compatibility of the 80286 with earlier processors. This freed up the equivalent amount of critical "base" or conventional memory, the first 640 KB of the PC's RAM – the area in which all MS-DOS applications run.

Additionally, on Intel 80386 machines, DR DOS's EMS memory manager allowed the OS to load DOS device drivers into upper memory blocks, further freeing base memory. For more information on this, see the article on the Upper Memory Area (UMA).

DR DOS 5.0 was the first DOS to integrate such functionality into the base OS (loading device drivers into upper memory blocks was possible using third-party software like QEMM). This allowed it, on a 386 system, to provide significantly more free conventional memory than any other DOS.

DR DOS 5.0, with a little manual tweaking, could load all this and still keep all of its conventional memory free – allowing for some necessary DOS data structures, as much as 620 KB out of the 640 KB.

SYSTEM REQUIREMENTS

• IBM PC compatible computers
• Hard disc space
• Floppy disk drive/reader
• Keyboard and Mouse

FRAKT PRISER

21 kr utan spårningsnummer

45 kr med spårningsnummer

Leverans utanför Europa kostar 50 Kr med spårningsnummer

Kartong och/eller bubbelplast påse samt skyddsmaterial ingår i fraktpriserna.

SHIPPING PRICES

21 SEK excluding tracking number

45 SEK including tracking number

Delivery to countries outside of Europe is 50 SEK including tracking number

Box and/or padded envelope and protection material is included.