MAI Basic Four 2000 Series, Service Manual

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BFISD 8079
SEARCH COMMAND ARGUMENT REQUIRED DATA
BYTES PARAMETER
0 to 3 Record Size (bytes) - This must equal the blocksize
or zero. Zero will be taken to mean the format
blocksize.
4 to 7 First Record Offset (bytes) - This must be zero.
8 to 11 Number of Records - This must be less than or equal
to the number of blocks specified in the command and
greater than zero. The search will terminate upon a
match or when the smaller of these values is encoun-
tered.
12 to 13 Search Argument Length (bytes) - The number of bytes
in the following search argument. Must equal the
pattern length plus six.
14 to 17 Search Field Displacement - The displacement from
the beginning of the record to the first byte to be
compared. Must be zero.
18 to 19 Pattern Length (M bytes) - The number of bytes in
the following data pattern to be compared with a
like size field in each record. Pattern length must
equal blocksize.
20 to M+19 Data Pattern - A variable length field of M bytes up
to blocksize minus displacement bytes. The pattern
must be one block long.
8.4 MAINTENANCE
The following paragraphs provide information necessary for maintenance of the
5.25" Winchester Drive. Included are removal and replacement procedures for
major subassemblies and a description of the built-in diagnostics. The Win-
chester Drive requires no preventive maintenance and has no adjustments.
8.4.1 Diagnostics
All diagnostics are divided into three sections: (1) Power-Up Diagnostics;
(2) Operational Error; (3) Fault Diagnostics.
8.4.1.1 Power-Up Diagnostics
During the power-up sequence in the Drive, a number of automatic diagnostic
routine sequences are performed before the Drive becomes ready for system
usage. When a fault occurs, an appropriate error code is displayed in the
fault indicators. Table 8-14 lists the description of these tests and the ap-
plicable error code.
8-44