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SECTION 1
GENERAL DESCRIPTION
INTRODUCTION
This document provides required information
in order to evaluate or incorporate Tandon's
disk drive into a system.
Tandon Corporation's Model Numbers
TM848-1E and TM848-2E, eight-inch flexible
drives are full-feature, microprocessor-
controlled drives. They may be installed in
one-half the space normally required for an
eight-inch drive. They are compact data stor-
age devices that use an IBM-formatted, indus-
try standard, eight-inch diskette. Both drives
are 48 tracks per inch recording devices.
The Model TM848 series of drives are capable
of reading and writing in single-density
format on a diskette, using a proprietary
read/write head patented by Tandon. In
addition, both drives have a double density
capability when Modified Frequency Modula-
tion (MFM) or other appropriate recording
techniques are used. The encoding and decod-
ing of the data is done by the user's controller.
The Model TM848-1 E drive uses one side of
the diskette for data storage. The Model
TM848-2E drive doubles data storage capabili-
ties by using both sides of the diskette.
1.1
SCOPE OF THE DOCUMENT
This document contains a description of the
major features, physical and functional speci-
fications, mounting and power requirements,
the interface, and typical timing characteris-
tics of the TM848-1E and TM848-2E drives.
1.2 PURPOSE OF THE DRIVE
The TM848-1E and TM848-2E drives are
rotating disk memories designed for random
access data entry, storage, and retrieval
applications. Typical applications include
1-1
intelligent terminal controllers, micro-
computers, word processing systems, data com-
munication systems, error logging, program
loading, and point-of-sale terminals.
1.3 MAJOR FEATURES
MICROPROCESSOR CONTROL
The TM848-1E and TM848-2E drives feature
an onboard microprocessor. This microproces-
sor provides six major features:
1.
Buffered seek capabilities..
2. Improved head positioning accuracy
with reduced hysteresis.
3. Write current switching for optimal
data recording quality.
4. True Ready signal.
5. Internal diagnostics (strappable).
6. Power On Self-Tests.
WRITE PROTECT
When a write protected diskette is inserted
into the drive, the write electronics are
disabled.
DAISY CHAIN CAPABILITY
The drive provides the address selection and
gating functions necessary to daisy chain a
maximum of four units at the user's option.
The last drive on the daisy chain terminates
the interface. The terminations are accom-
plished by a resistor array plugged into a DIP
socket.
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