MS DOS® Version 2.05 - Digital OEM



Label used with permission of DEC® Corporation

Boot Screen:


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Copyright 1983 Digital Equipment Corporation

MS-DOS Version 2.05



Copyright 1981, 82 Microsoft Corporation



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Package Contents:

Package images used with permission
DEC® Corporation
Outer box, cardstock, P/N: 99-07228-02
DEC Rainbow User's Guide, P/N: N/A
Diskette case, paper, P/N: 9907051-03 Rev. A1
Diskette, P/N; BL-Y895A-BV


Collector's notes:
Rated: Rare and unusual.
Estimated Value (complete package): Mint-$100 VG-$80 G-$70

Vital Statistics:

Release Date: October, 1983
Disks in Set: 1
Diskette Form Factor: RX50 format, double density
Sectors per track: 10
Capacity: 390k
(Formatted with a 1:1 interleave on standard 360k media)
Disk Sides: 2


Version string (sector n/a, offset n/a)



(sample taken from IO.SYS image file)

21 58 CF 0D 0A 4D 53 2D  44 4F 53 20 76 65 72 73 |     MS-DOS vers

69 6F 6E 20 32 2E 30 35  0D 0A 43 6F 70 79 72 69 |ion 2.05..Copyri

67 68 74 20 31 39 38 31  2C 38 32 20 4D 69 63 72 |ght 1981,82 Micr

6F 73 6F 66 74 20 43 6F  72 70                   |osoft Corp


Disk 1: 10/08/1983 11:20p 12,288 IO.SYS 09/28/1983 09:36a 17,126 MS-DOS.SYS 09/26/1983 03:21a 15,925 COMMAND.COM 10/13/1983 09:55a 72,534 BACKUP.EXE 09/18/1983 04:00p 6,330 CHKDSK.COM 09/17/1983 10:27a 20 CONFIG.SYS 10/12/1983 07:39a 13,824 CREF.EXE 02/01/1983 02:13a 11,764 DEBUG.COM 02/14/1983 08:39a 1,419 DISKCOPY.COM 05/17/1983 08:31a 4,489 EDLIN.COM 02/01/1983 01:19a 1,649 EXE2BIN.EXE 02/01/1983 01:36a 2,553 FC.EXE 01/14/1983 10:35a 5,796 FIND.EXE 10/07/1983 04:27a 19,405 FORMAT.COM 01/06/1983 08:36a 42,368 LINK.EXE 10/12/1983 07:36a 77,440 MASM.EXE 09/27/1983 02:38p 873 MDRIVE.COM 09/27/1983 03:46p 953 MDRIVE.SYS 10/10/1983 01:25a 1,396 MEDIACHK.EXE 01/14/1983 10:42a 4,364 MORE.COM 09/18/1983 03:58p 3,335 PRINT.COM 10/14/1983 01:45a 9,194 RDCPM.EXE 10/16/1983 11:42p 18,238 README.HLP 02/01/1983 06:22a 2,277 RECOVER.COM 05/17/1983 08:34a 1,360 SORT.EXE 09/26/1983 09:04a 850 SYS.COM 26 file(s) 347,770 bytes 393,216 bytes total disk space 29,414 bytes in 2 hidden files 318,356 bytes in 24 user files 40,448 bytes available on disk

MD5 Signatures:

IO.SYS AAA2BDE2B0EDE062383C78BA44D69AA4 MSDOS.SYS BA6FFCAB06A6414DD67ACB59346FACBD COMMAND.COM 52553724DCBC67B26406EF457170D6FE VER command: N/A

Version History:

An early OEM from Microsoft® Corporation for the DEC Rainbow Personal Computer. The disk format was proprietary RX50 using 10 sectors per track to pack 390k of data onto a 360 disk. A special device driver was required to be able to read and write between CP/M and RX50 (included on this disk, RDCPM.EXE). There was also a third party utility RAINDOS.SYS that allowed a virtual drive letter assignment to access the diskette on DOS-based PC's. Notable to this version was the first appearance of a RAM Drive capability ever released for DOS using the (MDRIVE) commands in the system's config.sys file.