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- ───────────────────▄─ Quarterdeck Office Systems
- ────────────────▄▄▄── 150 Pico Boulevard
- ─────────────▄▄▄▄▄─── Santa Monica CA 90405
- ──────────▄▄▄▄▄▄▄────
- ───────▄▄▄▄▄▄▄▄▄─────
- ────▄▄▄▄▄▄▄▄▄▄▄──────
-
- November 9th, 1993
-
- QEMM Patch for version 7.02 dated 11/9/93
-
- This patchfile implements fixes to QEMM version 7.02. This patch
- will work ONLY on QEMM version 7.02. The dates on the QEMM386.SYS (in
- your QEMM directory) should be 11/9/93. If the date on these files is later
- than 11/9/93, you do not need this patch.
-
- This patch should be applied by copying the files which should
- accompany this README (PATCH.EXE, 702to703.RTP, README.RTP,
- TECHNOTE.RTP, YESNO.COM and 702to703.BAT) into your QEMM
- directory, and then typing
-
- 702to703
-
- After the patch has been successfully applied, you may delete the
- following files (if any still exist) from your QEMM directory:
-
- 702to703.ZIP
- PATCH.EXE
- 702to703.RTP
- README.RTP
- TECHNOTE.RTP
- YESNO.COM
- 702to703.BAT
- README.702 (this file)
-
- The following enhancements and changes have been made in the QEMM 7.03
- package.
-
- The most significant changes relate to Stealth DoubleSpace:
-
- 1) Most of the changes to ST-DBL for QEMM 7.03 relate to compatibility
- issues with MS-DOS 6.20 and its two new features: AutoMount and
- DoubleGuard. MS-DOS 6.2's DoubleSpace is distinctly different from
- the 6.0 version; many modifications were required in QEMM/ST-DBL
- 7.03 to accommodate these changes.
-
- 2) Stealth DoubleSpace should now provide greatly improved performance
- on many systems.
-
- Stealth DoubleSpace works by mapping DoubleSpace's code out of DOS'
- address space, and then mapping DoubleSpace into the page frame when
- that code is needed. DoubleSpace may make calls which require the
- disk ROM. When Stealth ROM is active, the disk ROM is also mapped
- out of DOS' address space most of the time, and is mapped into the
- page frame when it's needed. Mapping the disk ROM into the page
- frame requires DoubleSpace's code to be mapped out of the page
- frame! To cope with this, Stealth DoubleSpace sets up a buffer into
- which data being read from or written to the disk can be placed
- temporarily while these mapping operations take place. (QEMM386
- sets up a similar buffer when its DBF=n parameter is in use, for
- other programs such as EMS disk caches that make disk requests from
- the page frame.)
-
- Stealth DoubleSpace in QEMM 7.03 improves on previous versions by
- providing buffering at a lower level than before, intercepting and
- buffering calls to only those block devices and device drivers
- (typically hard drives and disk caches) that were in place when
- Stealth DoubleSpace loaded. Stealth DoubleSpace also uses more
- sophisticated algorithms to determine when buffering is necessary:
- it now provides buffering only when the Stealth ROM feature is
- active and when QEMM386.SYS has not already established a disk
- buffer.
-
- 3) Without any parameters on the ST-DBL.SYS line in CONFIG.SYS, the
- buffer in (2) above is 1K. The size of this buffer can be increased
- by adding the DB=x parameter, where x is a number representing the
- size of the buffer in kilobytes. A larger buffer gives better
- performance at the expense of additional conventional memory or High
- RAM overhead. You may wish to try DB=4 when you are using Stealth
- ROM and you are not using a disk cache. The buffer can be disabled
- by using the DB:N parameter.
-
- To set up a 4K buffer for ST-DBL, add DB=4 to the ST-DBL.SYS line in
- CONFIG.SYS:
-
- DEVICE=C:\QEMM\ST-DBL.SYS DB=4
-
- 4) Expanded memory disk caches may require a different ST-DBL
- parameter, EXPCACHE, which makes ST-DBL use a slower but more
- comprehensive form of buffering. This parameter has a similar syntax
- to DB; EXPCACHE=4 would set up a 4K buffer, and EXPCACHE:Y would
- enable this feature with a 1K cache. EXPCACHE:N is a valid
- parameter, but is not particularly useful since EXPCACHE is disabled
- by default.
-
-
- Other enhancements to the QEMM package include the following:
-
- 1) Stealth ROM has been improved to provide better support for video
- ROMs on many machines, including Toshiba laptops. This enhancement
- should eliminate the need for EXCLUDEs in the C000-C7FF range when
- using Stealth on such machines.
-
- 2) Stealth ROM has also been enhanced to reduce significantly the need
- for XST=C000 and/or EXCLUDES in the C000-C7FF region when using
- Microsoft Windows in 386 enhanced mode with high-resolution and/or
- proprietary graphics drivers.
-
- 3) QEMM386 includes improved support for Compaq machines, which may
- suppress spurious ROM 101 Errors at boot time on older BIOSes.
-
- 4) QEMM386 better supports Virtual DMA Services, and includes fixes for
- some conflicts with Adaptec bus-mastering hard drive controllers.
-
- 5) QEMM386's DISKBUF feature (invoked by the DB=nn parameter) now
- continues to operate when Microsoft Windows is running in 386
- enhanced mode. This gives significantly improved support for
- bus-mastering hard drive controllers.
-
- 6) Changes have been made to QEMM386 and OPTIMIZE to improve detection
- of 32K video ROMs that claim inaccurately to be 24K in size. This
- will address problems running OPTIMIZE on Dell machines with Tseng
- Labs chipsets. Additionally, QEMM and OPTIMIZE now flush the
- instruction cache on 486 processors before rebooting, which will
- suppress spurious detection of adapter RAM on some machines.
-
- 7) QEMM386 and DOS-Up incorporate better support for MS-DOS'
- DoubleSpace and for programs that use the Microsoft Real-time
- Compression Interface when QEMM is installed on an uncompressed
- drive.
-
- 8) Stealth and DOS-Up incorporate support for diskless or
- floppy-disk-only workstations and remote-boot systems. DOSDATA may
- now be used on such systems, and the floppy disk ROMs can be
- Stealthed.
-
- 9) DOSDATA has been modified to suppress printer resets as it
- reinitializes the operating system.
-
- 10) A potential problem with DOS error code translations has been
- addressed. The only known symptom of this problem relates to using
- WordPerfect on a a Microsoft LAN Manager read-only drive.
-
- 11) Manifest has been enhanced to improve reporting the size of video
- ROMs, certain video cards, network directory path names, and higher
- baud rates on serial ports.
-
- **************************************************************************
- *These files may be copied and distributed freely as long as they are *
- *distributed together, in their entirety, and not distributed for profit.*
- * Copyright (C) 1993 by Quarterdeck Office Systems *
- ************************ E N D O F F I L E ***************************
-
-
-