PATCH FILE DOS21


This patch corrects 7 problems in DOS 2.10

The files patched are IBMDOS.COM,TREE.COM
This file should always be in the root directory.


Patch 1 -  Get disk freespace function call will occasionally modify a buffer
	   incorrectly. (IBMDOS.COM)
Patch 2 -  Same patch continued. (IBMDOS.COM)
Patch 3 -  Aborting to INT 24 does not restore vectors from PSP header.
	   Noticeably, after using the EXEC system call if the parent gets an
	   INT 24, an abort response will not go back to the parent. (IBMDOS.COM)
Patch 4 -  Reads from non-console devices in ASCII mode return incorrect counts
	   for a character read. (IBMDOS.COM)
Patch 5 -  Correctly handle Non Maskable keyboard interupts on PCjr. (IBMDOS.COM)
Patch 6 -  Continued (IBMDOS.COM)
Patch 7 -  Continued (IBMDOS.COM)
Patch 8 -  Continued (IBMDOS.COM)
Patch 9 -  Continued (IBMDOS.COM)
Patch 10 - Continued (IBMDOS.COM)
Patch 11 - TREE.COM would stop a listing if a directory in the root had an 11
	   character name and had at least one subdirectory in it.
Patch 12 - Fixes HOTLINE DLE009