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-
- PATCH320.DOC File
-
- Notes on patching IBM(R) PC-DOS Version 3.20
-
- (C) Copyright Microsoft Corporation, 1988
-
-
- Version 3.20 of IBM(R) PC-DOS contains a bug that can cause unexpected results
- in programs that generate floating-point exceptions. This file explains how to
- install a small patch in DOS to eliminate the problem.
-
- It is especially important to install this patch if you wish to use the C
- run-time routine signal with the SIGFPE parameter, since that routine does
- not work correctly in the unpatched version of IBM PC-DOS 3.20. IBM Corporation
- also supplies a patch to eliminate this problem.
-
- Note that MS-DOS(R) Version 3.20 contains another, different floating-point
- bug. The README.DOC file for this release tells you where to find more
- information about installing a patch for that bug. If you use any version of
- DOS 3.20 other than IBM PC-DOS 3.20 or MS-DOS 3.20, contact your hardware
- manufacturer to determine whether the problem exists in your version.
-
- You can install the DOS patch for IBM PC-DOS 3.20 by following these steps:
-
- 1. Format a blank floppy disk. (Do NOT use the /s formatting option to
- transfer system files to the disk.)
-
- 2. Use the SYS command to copy the files IBMDOS.COM and IBMBIO.COM to
- the new disk. For example, if you boot from drive C:, you could use
- these commands:
-
- C:
- SYS A:
-
- 3. Use the COPY command to copy the files COMMAND.COM, SYS.COM, and
- DEBUG.COM to the new disk.
-
- 4. Use the COPY command to copy the files STKPAT.BAT, STKPAT.SCR,
- RMRHS.EXE, and SETRHS.EXE from the \PATCH directory of your hard-disk
- drive to the new disk.
-
- 5. Reboot your system from the floppy disk that you prepared in steps 1-4.
-
- 6. Run the STKPAT.BAT file to patch the IBMBIO.COM file on the new disk.
-
- 7. Use the SYS command to transfer the patch from the floppy disk to any
- other Version 3.20 disk. For example, if you normally boot from drive
- C:, you would enter these commands to transfer the patched DOS to
- your hard-disk drive:
-
- A:
- SYS C:
-
- This installs the patch.
-
- 8. Reboot your system as you normally do.
-