MBF COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN

SERVICE GROUP(S): MICRO,MINI           MFG: MICRO PERIPHERALS

 NACS  TYPE(S): 9651                   MFG. MODEL(S): 91,92

CATEGORY: DISK I/O                     DESC: 5 1/4" FLOPPY DISK

                   *** TABLE OF CONTENTS AS OF 12/19/90 ***
FIB 00001.General Information.........................................03/27/87
FIB 00002.Floppy disk read/write head alignment - on Basic Four S/10..02/01/83


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FIB 00001                                                             03/27/87

                          *** General Information ***                        

Micro Peripheral models 91 & 92 are 5 1/4" double density (single/double sided)
floppy disk drives for microcomputers.

Basic Four uses the model 92 (double density/double sided) in the S/10 system
which is manufactured by Direct (model OA1000).

               ***  NACS  MACHINE TYPES AND FEATURE NUMBERS ***

Micro.Peripherals Inc. Model 92 double density/double sided - Sorbus Type - 9651

                        *** AVAILABLE DOCUMENTATION ***

 Information on this disk drive may be found in:

    Basic Four System S/10 Service Manual BFISD 8072 - S-HDBK-B22


ORIGINATOR: N. JONES


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       *** Floppy disk read/write head alignment - on Basic Four S/10 ***

 There are 2 types of Floppy drives in the field, one contains heads with 0
minutes azimuth and the other contains heads with 33 minutes azimuth.

 The drives with the 33 minutes heads are identified by a label marked 92S-949,
92S-H049 or 92S-049 attached to the rear of the drive.

 All the drives without a label or with other numbers are considered to be 0
minutes azimuth.

 Head alignment requires the use of the correct type of Alignment diskette:
0 Minutes Alignment Diskette

 Sorbus P/N OR997749, Dysan Model 224/2A, Dysan P/N 800180

    Index to data (burst)                Track  2
    Radial Alignment (cat's-eye)         Track 32
    Index to data (burst)                Track 68
    33 Minutes Alignment Diskette

Sorbus P/N MM529030, Dysan Model 206/30, Dysan P/N 802020

    Index to data (burst)                Track  8
    Radial Alignment (cat's-eye)         Track 32
    Index to data (burst)                Track 56

POSITIONING THE HEADS TO THE PROPER TRACK FOR ADJUSTMENT:

S/10 PHASE 1A (Original).  This type of hardware is repaired at the Sorbus   
Repair Center/Sorbus Station only.

Use program ALIGN2 running under CP/M.  This program was distributed with the
early releases of the S/10.

NOTE:  If ALIGN2 is not available use BB/M and the procedure indicated below:

    S/10 PHASE 1B (New style).  To position the heads use BB/M and the GET
    directive:

    Use the following commands:

    DIM A$(256)
    GET D, T*32+H,A$
    D=Disc, T=Track, H=0 (upper head), H=16 (lower head)

Examples:

    To position the heads to track 32, Head 0: GET D, 32*32,A$
    To position the heads to track 32, Head 1: GET D, 32*32+16,A$

NOTE: The only proper way to align the floppy disk drives on an S/10 system is
to physically remove them from the system, place on a suitable working surface,
and align while physically connected to the system. Any other method may
introduce error due to noise.

ORIGINATOR: J. VAN OORDT


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