| Build of MS-DOS 3 | |
 | |
| Architecture | x86 16-bit |
|---|---|
| Compiled | 1984-07-03 |
| Works in | |
MS-DOS 3.00 Beta Test Release 3.00 is a beta build of MS-DOS 3, which was shared on 2 March 2025.[1]
README contents
This release contains a documentation file to help you with your adaptation. REDIR.DOC (see MS-NET disk) describes how to customize the redirector for non-IBM architectures. This need not be modified if you are running in an IBM architecture. BIOS.DOC describes MS-DOS 3.0 device drivers. Extensions to the old 2.x specification are high lighted with vertical bars in the margin. Pay particular attention to printer open and close (see also REDIR.DOC for this) and removable media indicator. Printer open/close must be implemented in the PRN device driver if printing is to be allowed over the network. Removable media indicator must be implemented if you wish to avoid seeing the message "Insert diskette..." when MS-DOS is referring to your hard disk. This releae of MS-DOS 3.0 does not contain FORMAT, or PRINT. These will be contained in subsequent releases. In order to set your self up for use on the IBM PC, please follow these procedures: 0. Back yourself up. a. Make a copy of the distributed MS-DOS 3.0 diskette to save yourself a headache. 1. Building a BIOS. You will need to obtain a MS-DOS 2.1 from your local IBM man, if you don't already have one. a. Use the IBM utility DISKCOPY to make a single-sided, 9-sector copy of this bootable disk since the original is write protected. b. Insert this copy of the 2.1 diskette into drive A:. c. Issue the command "DEBUG" to invoke the debugger. d. Issue the command "L100 0 5 1" to read the first directory sector. e. Issue the command "D" to display this first sector. You see the files IBMBIO.COM and IBMDOS.COM. f. Issue the command "E10B 20" to change the attribute byte of IBMBIO.COM g. Issue the command "W100 0 5 1" to write the modified sector to the copy of 2.1, followed by the "Q" command to leave DEBUG. h. Copy the file IBMBIO.COM from the 2.1 diskette to the file OLDBIO.COM on the MS-DOS 3.0 beta diskette. i. Using BASIC, run the program MUNGE.BAS on MS-DOS 3.0 Beta. This will create the file IBMBIO.COM on the MS-DOS Beta diskette from the files OLDBIO.COM and FIXBIO.COM. j. Now format a blank diskette and copy the files IBMBIO.COM, MSDOS.SYS (renaming it to IBMDOS.COM), and COMMAND.COM in that order from the MS-DOS beta diskette. k. We have done these steps since IBM has the copyright on the IBMBIO.COM and neither we nor you have the right to distribute this.
Floppy disk