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-
- ReSizeable RAMDisk version 1.20
- for XMS memory only
-
- Author
- Marko Kohtala
-
- PUBLIC DOMAIN
-
-
- No rights reserved. All parts of this product may be reproduced,
- stored in a retrieval system, or transmitted by any means, electronic,
- mechanical, protocopying, recording, or otherwise, without written
- permission from the author. No patent liability is assumed with respect
- to the use of the information contained herein. While every precaution
- has been taken in the preparation of this product, THE AUTHOR ASSUMES NO
- RESPONSIBILITY FOR ERRORS OR OMISSIONS. NEITHER IS ANY LIABILITY ASSUMED
- FOR DAMAGES RESULTING FROM THE USE OF THE PRODUCT DOCUMENTED HEREIN.
-
-
-
- CONTENTS
-
- 1. Publishing purpose, features included and recognised missing
- 2. Files in this release
- 3. Usage
- 4. Technical data for further development
- 5. Last words
-
-
-
- 1. PUBLISHING PURPOSE, FEATURES INCLUDED AND RECOGNISED MISSING
-
- This RAM disk driver is published in the hope we will get a really good
- RAM disk that is entirely public domain. I do not intend to make it all
- out myself but rather hope there is out there someone who is willing to
- participate in my work.
-
- This RAM disk currently supports the following features:
-
- * XMS (Extended memory on 286 and up with HIMEM) support - no other
- memory supported - yet
- * Resizeable/removable - destructive
- * Possible sizes from few Kbytes to 32M (provided you have enough
- memory, of course)
- * Configurable
- - sector size
- - cluster size
- - root directory entry count
- - number of FATs
- * Predefined DOS disk like formats
- * Write protection
- * Compatible with DOS versions from 2.00 to 5.x
- (tested only with DOS 5.0)
- * Stores last format time in volume label
-
- What I would like to see added:
-
- * Resizing of the disk without loosing disk contents
- * EMS support
- * UMB support
- * Bank-Switch memory support ("The Last Byte" by Key Software)
- * Low memory support
- * Any combinations of those above (Bank-Switch+XMS/EMS mostly)
-
-
-
- 2. FILES IN THIS RELEASE
-
- The following material is distributed in this release:
-
- SRDISK.DOC this document
- SRDISK.C disk formatter source code for Turbo C++ 1.0
- RDISK.ASM device driver source code for XMS
- RDISK.SYS compiled device driver
- SRDISK.EXE compiled formatter program for the RAM disk
-
-
-
- 3. USAGE
-
- To use the RAM disk, you must have the device driver installed at boot
- time. This can be done by copying the RDISK.SYS to the root directory of
- your boot disk and including the line
-
- DEVICE=RDISK.SYS
-
- to your CONFIG.SYS file.
-
- After this change, when you boot your machine you should see a sign-on
- message close like "ReSizeable RAMDisk version x.xx virtual drive d:"
- without any annoying error messages.
-
- If you see error messages, you may have forgotten to install the XMS
- driver (eg. HIMEM.SYS) prior to the RDISK.SYS, or you have improper DOS
- version or something. Try to fix the problem. If you fail... sorry.
-
- If no errors are detected, you have no ramdisk. If you try to use that
- disk mentioned on the sign-on message, you'll notice the disk is not
- ready. That is because the ramdisk has not been enabled yet. For that
- you need the SRDISK.EXE.
-
- The disk can be enabled by, for example, using command "SRDISK d: 1024"
- which will make disk d: a 1024K disk. It can be disabled by making it of
- size 0: "SRDISK d: 0".
-
- The SRDISK is self documented. You'll get the documentation by typing at
- the DOS prompt "SRDISK /?" and hitting enter.
-
-
-
- 4. TECHNICAL DATA FOR FURTHER DEVELOPMENT
-
- The job is split between the device driver and the SRDISK program this
- way:
-
- Device driver does:
-
- * What ever a RAM disk driver is expected by the DOS to do.
-
- * Support IOCTL calls using the one defined data packet. The packet
- contains the following data:
- - BIOS parameter block for the drive.
- - Disk size in K-bytes.
- - Read/write access flags (read flag is actually enabled flag).
- - Media byte.
- - Flag to tell if the media has changed (set by SRDISK).
- - Number of open files on drive.
- - Pointer to the sector read/write function in the driver.
- - Some information about what kind of memory can be used for the
- disk.
-
- * Allocate, reallocate and free what ever disk memory is used by the
- driver.
-
- SRDISK does:
-
- * Send the driver the new disk format (with media change flag set).
-
- * Format the new disk i.e. write the boot sector, FAT(s) and root
- directory according to the format sent to driver.
-
- I've done it this way because I did not want to bother myself adding the
- SRDISK functions to the driver too. Some program was anyway needed to
- control the driver.
-
- I am planning to redesign the device driver so that one can hook many
- device drivers all supporting different kinds of memory to one logical
- drive. This would remove the need for drivers that use many different
- kinds of memory and allow user to make driver combinations of his own.
-
- The sources are somewhat documented.
-
-
-
- 5. LAST WORDS
-
- Although no rights are reserved, I HOPE you will send any modified
- versions, new drivers, better documentation, bug reports, suggestions
- and your love (preferably female) to me. If I can, I'll then add them to
- the next release of SRDISK.
-
- I'd like the modifications to sources as patches to some version the
- number of which you should tell.
-
- Make sure every material you contribute is in public domain. I do not
- want to add any copyright texts to this product. While I was starting
- this thing, I tried to find some PD sources where to start and found
- none - I only got frustrated. I hope to fix that too.
-
- I'll make a list of every people contributing material to this product
- and ship it with further releases. If modesty is one of your virtues, I
- can leave you out of the list.
-
- You can contact me by sending E-mail from
-
- Internet, Bitnet etc. to 'mkohtala@niksula.hut.fi'
- CompuServe to '>INTERNET:mkohtala@niksula.hut.fi'
-
- or by calling Airline QBBS, 24H, HST, V.32, V.42, MNP, +358-0-8725380,
- and leaving mail to me, Marko Kohtala.
-