MBF COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN

SERVICE GROUP(S): MICRO                MFG: IOMEGA

 NACS  TYPE(S): 7010,7258,9258         MFG. MODEL(S): 10,20

CATEGORY: DISK I/O                     DESC: BERNOULLI BOX                   

                   *** TABLE OF CONTENTS AS OF 12/19/90 ***
FIB 00001.GENERAL INFORMATION...............................(Text Inco07/22/88
FIB 00002.SOFTWARE COMPATIBILITY......................................03/16/87
FIB 00003.BOOT FAILURES WITH PC-2 INTERFACE BOARD.....................10/01/87
FIB 00004.SYSTEM HANGS BEFORE FORMAT IS COMPLETE......................12/07/87
FIB 00005.MICROCODE VERSION "2C" FOR ALPHA FULL HEIGHT DRIVES.........07/22/88


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FIB 00002                                                             03/16/87

                         *** SOFTWARE COMPATIBILITY ***

SYMPTOM: SOFTWARE INSTALLATION

PROBLEM DETERMINATION:

FIX: IF DOS 3.2 IS BEING USED, THE IOMEG SOFTWARE MUST BE VERSION 2.31       
OR BETTER. THIS IS BASED ON INFO FROM IOMEGA.


ORIGINATOR: KEN ENGELHART


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FIB 00003                                                             10/01/87

                *** BOOT FAILURES WITH PC-2 INTERFACE BOARD ***


SUBJ:IOMEGA BERNOULLI BOX USING PC-2 INTERFACE PCB WITH BOOT ROM

SYMPTOM:
PC-2 INTERFACE PCB WITH BOOT ROM INSTALLED CAN CAUSE FAILURE TO BOOT FROM
BERNOULLI WITH COVER INSTALLED ON THE 'COMPUTER'. REMOVAL OF THE COVER
ALLOWS THE SYSTEM TO BOOT FROM THE BERNOULLI.

FIX:  THE PROBLEM HAS BEEN
IDENTIFIED BY IOMEGA AS AN RFI PROBLEM WITH VERSION 4.41 FIRMWARE BURNED
INTO AM27128A BLANKS.  IN THIS INSTANCE, IOMEGA IS HANDLING REPLACEMENT
OF THE ROM DIRECTLY WITH THE CUSTOMER.  IF YOU SUSPECT THAT THIS IS THE
PROBLEM, PEEL BACK THE WHITE LABEL ON THE ROM TO SEE IF IT IS THE AM27128A
BLANK. IF IT IS ORDER A REPLACEMENT FROM IOMEGA.

COMMENT:
IOMEGA THINKS THAT THEY HAVE CAUGHT AND REPLACED MOST OF THESE BAD CHIPS.
INCIDENTS WILL BE HANDLED ON A CASE BY CASE BASIS.


ORIGINATOR: TOM DIANORA, DEAN LOWMAN                                         
            DISTRICT 11 DPSS


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FIB 00004                                                             12/07/87

                *** SYSTEM HANGS BEFORE FORMAT IS COMPLETE. ***

SYMPTOM/TEXT: WHILE ATTEMPTING A FORMAT USING THE A10FMT20 PROGRAM (WITH THE /F 
OPTION SWITCH) THE SYSTEM WOULD HANG BEFORE COMPLETION OF THE FORMAT.
FIX: REPLACING THE CONTROLLER PCB (IM000102) FIXED THE PROBLEM.
ORIGINATOR: FRANK CARROLL  16FPS2


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FIB 00005                                                             07/22/88

          *** MICROCODE VERSION "2C" FOR ALPHA FULL HEIGHT DRIVES ***


NUMBER  SBA1G804                                               July 11, 1988


                        MICROCODE VERSION "2C"


   IOMEGA has released an improved version of microcode for the
   older Alpha Full Height (only) Bernoulli Boxes and 10.0 Megabyte
   SCSI drivrs.  This new version (level "2C") repairs a here-to-
   fore unknown bug that could, under special circumstances, cause
   "Sector Not Found" errors.                                                

   The special circumstances needed to cause this are:

        1) to have the "verify" option enabled, and

        2) to have the digital controller encounter a
           "time out" error during a write and verify
           operation across the bus.

   These "time out" errors do not occur in the "AT" (and AT
   clones) host computers, so the bug should never occur.  However,
   on "PC" (and PC clones) host computers, the "time out" error
   can occasionally occur and if verify is "on", the problem may
   happen.  Many systems operate with verify turned "off" and are,
   therefore, not susceptible to this bug.  Keep in mind, however,
   that if IOMEGA utilities version 4.48 software is used, the
   verify option is automatically invoked and can cause the problem
   to occur.

   For those "PC" type systems with a Full Height Bernoulli Box
   connected and the verify option "on", the only fix is to
   install this new code.

   This code comes in two versions.  If you are replacing a two IC
   microcode (IC's plugged in to U36 & U37), use P/N's 01058700 at
   U36 and 01058800 at U37.  For the single IC version (IC only at
   U37 and U36 empty), use P/N 01059100 at U37.  Remember, this is
   10.0 megabyte code.  Do not attempt to replace any 10.5 megabyte
   code (46, 49, etc.) with it.  The 10.0 megabyte SCSI units (with
   code 26, 29, 2A, etc.) received for repairs should be upgraded to
   level "2C" before it is returned to the customer.


ORIGINATOR:  JOHN HILL


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