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INTROOU CTION
This document provides required inf ormati on
in order to evaluate or incorporate Tandon's
disk drive into a system.
T andon
C o rporation's Model N u m b e r s
TM848-1E and TM848-2E, eight-inch flexible
drives are full-feature, microprocessor-
c ontrolled d r i v es. They m a y b e i n s t a l led i n
o ne-half th e s pace norm all y r e q u i red fo r a n
eight-inch drive. They are compact data stor-
age devices that use an IBM -f ormatt ed, indus-
try standard, eight-inch diskette. Both dr i v es
are 48 tracks per inch recording devices.
The Model TM848 series of drives are capable
of r e a d in g
a n d w ri t i n g i n si n g l e -density
format on a diskette, using a proprietary
r ead/writ e
h e a d p a t e n t e d b y Tan d o n . I n
addition, both d r i v e s h av e a d o u bl e d ensity
capability w hen M odi f ied Fr equency 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 T M 8 4 8-1E d r iv e u ses one side of
t he d i s k ett e
f o r d a t a s t o r a ge . T h e M o d e l
TM848-2E drive doubles data storage capabili-
ties by using both sides of the diskette.
1 .1 SCOPE OF THE DOCUM E N T
T his document contains a d e scription of t h e
major features, physical and functional speci-
fications, mounting an d p ower r e quirements,
the interface, and ty pical t i m i n g ch aracteris-
tics of the TM848-1E and TM848-2E drives.
1.2 P U RPOSE OF THE DRIVE
T he T M 8 4 8 -1E
a n d TM 8 4 8 -2 E d r i v e s a r e
rotating d isk m e m ories designed for r a n d om
access data entry, storage, and retrieval
a pplicat i o ns .
T y p i c a l a p p l i c a t i on s i n c l u d e
SECTION 1
GENERAL DESCRIPTION
i nte l l i g e n t
t er m i n a l
computers, word processing systems, data com-
munication systems, error logging, program
loading, and point-of-sale terminals.
1.3 MA JOR FEATURES
M ICROPRO C E S SOR CON T R O L
The TM848-1E and T M 8 48-2E drives featur e
an onboard microprocessor. This microproces-
sor provides six major features:
1. Bu f f ered seek capabilities..
2. I m p r oved
with reduced hysteresis.
3 . W r i t e
c u r r en t s w i t c h in g f o r o p t i m a l
data recording quality.
4. T ru e Ready signal.
5. I n t e r nal diagnostics (strappable).
6. Power On Self- Tests.
WRITE PROTECT
When a w r i t e p r o t ected di skette i s i n s erted
i nto t h e dr i v e , t h e w r i t e e l e c t r o nic s a r e
disabled.
DAISY CHAIN CAPABILITY
The drive provides the address selection and
gating functions necessary to daisy chain a
maximum o f f o u r u n i t s a t t h e u s er's option.
T he last dr ive on th e d aisy chain t e r m i n a t es
the i n t e r f ace. Th e
plished by a resistor array plugged into a DI P
socket.
1-1
con t r o l l e r s , m i c r o -
h e a d p o s i t i onin g a c c u r a cy
t e r m i n a t i ons ar e a c com-
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