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- 06/22/94
-
- This is the fourth BETA release of virtual ASPI for OS/2 2.1 that includes
- support for the ASPI for Windows specification. It is a minor improvement
- of the previous release, mostly to support scanners better.
-
- The following ASPI access methods are now supported:
-
- 1) DOS ASPI in a VDM.
- 2) DOS ASPI in a DOS boot image.
- 3) ASPI for Windows if a Win-OS/2 session.
- 4) DOS ASPI in a Win-OS/2 session.
-
- Fixes since the last (06/14/94) release:
-
- 1) VASPI.SYS will now work with more scanners. Many scanners apparently
- report their device type as 3 (processor) instead of 6 (scanner);
- the drivers now take this into consideration.
-
- 2) VASPI.SYS now takes the hardware limitations of the SCSI adapter
- into consideration when issuing requests. If the adapter hardware
- cannot handle the transfer based on length of scatter/gather list
- or size of CDB transfer, it will fail without being issued.
-
- 3) OS2ASPI.DMD will now interact correctly with filters.
-
- The following files are included as part of this BETA release:
-
- 1) VASPI.SYS - The virtual ASPI device driver
- 2) VDPX.SYS - A replacement virtual DPMI extended driver
- 3) OS2ASPI.DMD - An OS/2 ASPI manager that support VASPI.SYS
- 4) ASPISTUB.SYS - A stub driver for accessing VASPI.SYS from a DOS
- boot image.
- 5) WINASPI.DLL - This DLL allows Win-OS/2 applications to make requests
- using the ASPI for Windows convention. It is a replacement
- for the DLL shipped with EZ-SCSI and is intended for OS/2
- 2.1 only.
-
-
- Current limitations:
-
- 1) VASPI works best with OS/2 2.11 (OS/2 2.1 with Service Pack).
-
- 2) DOS ASPI (with posting) in a Win-OS/2 session does NOT work with
- OS/2 2.99 (Performance Beta). This problem appears to be very similar
- to the limitation that was present in the previous beta. If you are
- running Deskscan, you will have to use OS/2 2.11.
-
- 3) Seamless Windows applications may crash on OS/2 2.1. If this occurs,
- try updating to OS/2 2.11. Certain applications (i.e. Central Point
- Backup for Windows) work best with the ASPI for Windows interface.
- If you select ASPI for DOS, they may crash, regardless of the version
- of OS/2 you are running.
-
- Introduction to ASPI
-
- ASPI is an application interface that allows easier access to SCSI
- devices. When running DOS, users typically load an ASPI manager that
- routes all requests directly to the hardware. ASPI drivers (such as ASPIDISK
- and ASPICD) send requests to the ASPI manager which then sends the command
- on to the appropriate device.
-
- The device driver model used by OS/2 is layered (similar to ASPI) so that
- an adapter device driver (ADD) is responsible for knowing about the hardware
- dependencies of a particular SCSI adapter. Applications that wish to send
- ASPI requests do so by routing them to a device manager (OS2ASPI.DMD) which
- converts them into requests recognizable to any ADD.
-
- The ASPI support currently embedded within OS/2 2.1 allows any OS/2
- application to send commands to a SCSI device. However there are
- a large number of DOS and Windows applications that are could be
- supported if there commands were routed to OS2ASPI.DMD.
-
- VASPI.SYS is a virtual device driver that will allow DOS applications
- to issue SCSI commands that will be handled by OS2ASPI.DMD. If you
- have an existing DOS ASPI application it should now be able to run
- in a virtual DOS session under OS/2 2.1.
-
- *** IMPORTANT ***
- Since VASPI.SYS acts just like an ASPI manager, there is no reason to load
- a standard MS-DOS ASPI manager, such as ASPI4DOS.SYS. In fact, loading
- such a driver is NOT possible and will conflict with the ADD that has
- already initialized the adapter.
-
- Installation Instructions for VASPI Support
-
- 1) Install OS/2 2.1 on your system
- 2) Make a backup copy of the file OS2ASPI.DMD. This should be found
- in the \OS2 directory on your boot drive.
- 3) Copy the new VDD aware version of OS2ASPI.DMD into the \OS2 directory.
- 4) Copy the file VASPI.SYS into the directory \OS2\MDOS on your boot drive.
- 5) Make a backup copy of the file VDPX.SYS. This should be found in
- the \OS2\MDOS directory on your boot drive.
- 6) Copy the new BETA version of VDPX.SYS into the \OS2\MDOS directory.
- 7) Copy the file WINASPI.DLL into the \OS2\MDOS\WINOS2 directory.
- 5) Update CONFIG.SYS as follows:
- a) Make sure the line BASEDEV=OS2ASPI.DMD is present somewhere
- in the file.
-
- b) Add the line DEVICE=C:\OS2\MDOS\VASPI.SYS to the bottom of
- the file. If your boot drive is NOT C:, use the appropriate
- letter instead.
-
- 6) Shutdown your system and reboot.
- 7) Open a DOS window or DOS fullscreen and run your ASPI application.
-
- Installation Instructions for DOS Boot Image Support
-
- 1) Follow all the instructions for VDM Support.
- 2) Read the instructions for creating an image diskette in the OS/2
- Master Help Index.
- 3) Create the boot disk with all the files that you will require for
- other applications.
- 4) Add the file ASPISTUB.SYS to this boot disk and add the line
- DEVICE=\ASPISTUB.SYS to CONFIG.SYS on the boot disk.
- 5) Complete the boot image creation.
- 6) Open the image.
-
-
- Device Allocation
-
- OS/2 2.1 requires a device to be allocated by a device manager, such as
- OS2ASPI.DMD or OS2DASD.DMD before it can be accessed. Device managers can
- handle this in one of two ways: wait for a device driver to issue an
- allocation request (OS2SCSI.DMD does this) or permanently allocate the
- device during system boot (OS2DASD.DMD and OS2CDROM.DMD do this).
-
- The ASPI specification has no concept of device allocation and this really
- leaves it up to the implementation to decide what to do. Typically OS2ASPI
- will NOT allocate a device until the first execute I/O command is issued.
- This allows it to scan for devices and not interfere with them until an
- application decides to issue a command. However, once this allocation takes
- place OS2ASPI will not release the device because it can never be sure
- when the application is finished with it.
-
- Most people can use OS2ASPI.DMD without any command line switches, but
- there are typically two situations that can arise which OS2ASPI has to
- deal with :
-
- 1) A user wishes to use two applications via different interfaces
- (i.e. OS2ASPI and OS2SCSI) and both need to access the device.
- If the application using OS2SCSI is well behaved, it will release the device
- when it is finished and OS2ASPI will be able to allocate it. Unfortunately
- if OS2ASPI does not release the device, the OS2SCSI application will not
- be able to access the device until the system is rebooted and the device
- allocation information is reset.
-
- 2) A user wishes to access a device that has been permanently allocated
- by another device manager. A good example of this would be a diagnostic
- that wants to report information about the system configuration. If the
- devices are allocated to another manager though, the application will
- never be able to see them.
-
-
- These two problems can be overcome by the use of optional command line
- switches.
-
- /ALL - This switch will instruct OS2ASPI.DMD to allow commands to
- be issued to ANY device on the SCSI bus, even those allocated
- by other managers.
-
- *** WARNING *** Commands should be issued to devices under the control
- of other managers with extreme caution. If you are using the /ALL
- switch and plan to issue commands to devices that are shared with another
- manager, try and limit them to non destructive commands like Inquiry and
- Test Unit Ready.
-
- /SHARE - This switch will instruct OS2ASPI.DMD to release any target
- after each command, allowing multiple managers to access
- a target (at different times). Since this requires more
- commands to be issued to the driver, there will be a slight
- performance penalty when this switch is used.
-
-
- *** WARNING *** When sharing devices and sending multiple concurrent requests
- it is possible that the allocation/deallocation of the device will cause a
- command to be rejected. This switch is best suited for use when you have
- applications that require different managers but will not be used
- simultaneously.
-
- Examples:
- BASEDEV=OS2ASPI.DMD /SHARE
- BASEDEV=OS2ASPI.DMD /ALL
- BASEDEV=OS2ASPI.DMD /ALL /SHARE
-
- When you find a problem with VASPI.SYS, please send a description of
- it to Adaptec so that we can attempt to reproduce it. Please describe
- the exact steps required to reproduce your problem and include any
- screen dumps from the system where the problem occurred.
-
- There are several methods available for reporting problems:
-
- 1) The Adaptec BBS. The BBS can be reached at (408) 945-7727 and supports
- upto 14.4K baud with 8 data bits, no parity and 1 stop bit. Please send
- a PRIVATE message to the user VASPI_BETA.
-
- 2) Internet. You can send problem reports to the user vaspi@adaptex.cirr.com.
-