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OS/2 Shareware BBS: 8 Other
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dm2411.zip
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FIRM.TXT
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1993-07-29
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Firmware Release Notes
This document details all firmware changes made to the DM-xx24 series drive. At the
time of this document, interim firmware revision 1.1d is the latest change.
Changes
Affected
1.03 9/3/92 Auto speed reduction change at read
error detection. Auto switch operable
without performing a device reset.
Change Definition parameter altered to
support speed change. Mode sense page
code 2 and E supposedly fixed. SCSI xfer
timeout reset added.
1.04 Fixed minor SCSI Interrupt Handling.
1.05 10/27/92 Fixed Selection anomaly. Incorporated automatic low speed
to high speed switching. Modified calculation
of Lead-Out address for increased efficiency. Fixed Read
Header command anomaly.
1.06 11/18/92 Allowed drive to properly negotiate Synchronous
Transfer. Fixed a minor problem with data block size transfers smaller
than 2048 bytes. Modified Spindle motor braking algorithm
to increase reliability during seek operations.
1.08 1/26/93 This change incorporated many fixes and enhancements
including:
- Photo CD-Multi-Session Support.
- Limited support for Connect/Disconnect.
- Decreased processor initialization time.
- Allowed disc to recognize up to 99 audio tracks.
- Returned good status (pacified) for a prevent/allow media
removal command.
- Support Read Extended (28h) with transfer length = 0.
- Support to play first frame of first audio track.
- Increased reliability of LASER optics power management.
- Support for Linked Command and Relative Addressing***
- SCSI reset detection.
- 1 block disconnect/reconnect temporary fix.
- Pre-fetch support.
1.09 2/8/93 Delayed processor initialization so that drive system
power could settle first. This version fixed initial problem caused
by version 1.08.
1.10 4/28/93 Again several fixes:
- Fixed mis-calculation of sub channel MSF data.
- Fixed Mode Select Page Code E.
- Corrected Read Sub Channel to indicate correct audio
status of 'No Audio Status to Report' vice 'Audio Paused'.
- Fixed anomaly with Connect/Disconnect.
- Fixed problem with Arbitration
- Support for SCSI Abort command
- Corrected Pointer Messages
Developer Application Notes
All firmware revisions below 1.1 need to use the Audio Control command (C9h) instead of the SCSI-2
Mode Select/Sense Page Code (0Eh). The Page Code (0Eh) in the previous firmware releases did not
work reliably. This bulletin applies only for DOS specific drivers only. Owners of multi-tasking
operating systems (OS/2, NT, UNIX, etc.,) should upgrade to firmware 1.1. This latest firmware version
takes care of possible drive malfunction during large file transfers. Therefore, full implementation of
Page Code E can be included without concern of previous firmware levels.
Note Concerning Firmware Revision 1.1
The 1.1 firmware originally was intended for interim use only. However, progress to iron out remaining
issues with this version were never completed. Therefore, some minor problems exist with 1.1 that
should be mentioned.
1. During a SCSI reset, the drive issues two Unit Attentions instead of one. In most cases
this is no problem. However, using a Future Domain controller under OS/2 2.1, the
drive will not be recognized.
2. If media is placed inside the drive prior to DOS bootup, the drive may not initialize
properly. Therefore, remove the media from the drive prior to boot up.
3. During large file transfers the drive may reset itself. This only happens under OS/2 and
only in very isolated circumstances. The error is recoverable and shall not cause the
system to fail.