SECTION 1
GENERAL DESCRIPTION
INTRODUCTION
1.2 PURPOSE OF THE DRIVE
T h is d o c u m e n t p ro v id e s r e q u ir e d in f o r m a t io n
i n o r d e r to e v a lu a te o r in c o r p o r a te T a n d o n ’s
d is k d r iv e in t o a s y s te m .
T a n d o n
C o r p o r a t i o n ’ s
M o d e l
N u m b e r s
T M 8 4 8 -1 E a n d T M 8 4 8 -2 E , e ig h t- in c h f le x ib le
d r i v e s a r e
f u l l - f e a t u r e , m ic r o p r o c e s s o r -
c o n tr o lle d d riv e s . T h e y m a y be in s t a lle d in
o n e - h a lf th e space n o r m a lly r e q u ir e d f o r a n
e ig h t- in c h d r iv e . T h e y a re c o m p a c t d a ta s to r
a ge d e v ic e s t h a t use a n I B M - f o r m a t t e d , in d u s
t r y s ta n d a rd , e ig h t- in c h d is k e tte . B o th d riv e s
a re 4 8 tr a c k s p e r in c h r e c o r d in g d e vice s.
T h e M o d e l T M 8 4 8 s e rie s o f d riv e s a re c a p a b le
o f r e a d in g a n d w r i t i n g i n s in g le - d e n s ity
f o r m a t o n a d is k e tte , u s in g a p r o p r ie t a r y
r e a d / w r it e h e a d p a te n te d b y T a n d o n . I n
a d d itio n , b o th d riv e s h a v e a d o u b le d e n s ity
c a p a b ilit y w h e n M o d ifie d F re q u e n c y M o d u la
t io n ( M F M ) o r o th e r a p p r o p r ia te re c o r d in g
te c h n iq u e s a re used. T h e e n c o d in g a n d d e co d
in g o f th e d a ta is d o n e b y th e u s e r’s c o n tr o lle r .
T h e M o d e l T M 8 4 8 -1 E d r iv e uses one sid e o f
th e d is k e tte f o r d a ta s to ra g e . T h e M o d e l
T M 8 4 8 -2 E d r iv e d o u b le s d a ta s to ra g e c a p a b ili
tie s b y u s in g b o th s id e s o f th e d is k e tte .
1.1
SCOPE OF THE DOCUMENT
T h e T M 8 4 8 -1 E a n d T M 8 4 8 -2 E d r iv e s a re
r o t a t in g d is k m e m o rie s d e s ig n e d f o r ra n d o m
access d a ta e n tr y , s to ra g e , a n d r e t r ie v a l
a p p lic a t io n s . T y p ic a l a p p lic a tio n s in c lu d e
i n t e l l i g e n t t e r m i n a l c o n t r o lle r s , m ic r o
c o m p u te rs , w o rd p ro c e s s in g s y s te m s , d a ta c o m
m u n ic a tio n s y s te m s , e r r o r lo g g in g , p ro g ra m
lo a d in g , a n d p o in t-o f-s a le te r m in a ls .
1.3 MAJOR FEATURES
MICROPROCESSOR CONTROL
T h e T M 8 4 8 -1 E a n d T M 8 4 8 -2 E d riv e s fe a tu r e
a n o n b o a rd
m ic ro p ro c e s s o r p r o v id in g s ix
m a jo r fe a tu r e s :
1. B u ffe r e d seek c a p a b ilitie s .
2. Im p ro v e d h e a d p o s itio n in g a c c u ra c y
w it h re d u c e d h y s te re s is .
3. W r it e c u r r e n t s w itc h in g f o r o p tim a l
d a ta r e c o r d in g q u a lit y .
4. T ru e R e a d y s ig n a l.
5. I n t e r n a l d ia g n o s tic s (s tra p p a b le ).
6. P o w e r o n s e lf-te s ts .
T h is d o c u m e n t c o n ta in s a d e s c r ip tio n o f th e
m a jo r fe a tu re s , p h y s ic a l a n d f u n c t io n a l s p e c i
fic a tio n s , m o u n t in g a n d p o w e r r e q u ir e m e n ts ,
th e in te r fa c e , a n d t y p ic a l t i m i n g c h a r a c te r is -
WRITE PROTECT
tic s o f th e T M 8 4 8 - I E a n d T M 8 4 8 -2 E d riv e s . I n
a d d itio n , th e r e is a th e o r y o f o p e ra tio n , c h e c k s
a n d a d ju s t m e n t p ro c e d u re s , tr o u b le s h o o tin g
W h e n a w r it e p ro te c te d d is k e tte
is in s e rte d
' g u id e , r e p la c e m e n t p ro c e d u re s , a s s e m b ly
i n t o th e d r iv e , th e w r it e e le c tro n ic s
are
d r a w in g s a n d s c h e m a tic s .
d is a b le d .
1-1
Summary of Contents for 6000 HD
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Page 3: ...TANDY COMPUTER PRODUCTS SERVICE MANUAL TANDY 6000 6000 HD Catalog Number 26 6021 2...
Page 8: ...TANDY COMPUTER PRODUCTS...
Page 14: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 6...
Page 28: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 4 1 Adjustments 20...
Page 30: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 22...
Page 32: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 24...
Page 64: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 60...
Page 100: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 96...
Page 111: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 110...
Page 117: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 116...
Page 124: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Table 7 5 Input Output Port Map 125...
Page 127: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Table 7 6 Memory Map 128...
Page 141: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 142...
Page 151: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 152...
Page 152: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 153...
Page 153: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 155...
Page 154: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 1 5 7...
Page 155: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 159...
Page 156: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 161...
Page 157: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 163...
Page 161: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD Figure 7 11 Timing Diagram 168...
Page 182: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 189...
Page 183: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 191...
Page 197: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 206...
Page 198: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 207...
Page 206: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 2 1 6...
Page 207: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 217...
Page 225: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 236...
Page 226: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 237...
Page 228: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 241...
Page 246: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 260...
Page 248: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 262...
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Page 266: ...FIGURE 1 1 DISK DRIVE...
Page 268: ...2 2...
Page 279: ...FIGURE 3 2 CONTROL AND DATA TIMING REQUIREMENTS 3 7...
Page 283: ...FIGURE 3 3 LSI CIRCUIT BOARD ASSEMBLY 3 11...
Page 289: ...FIGURE 3 5 DISKETTE CARE AND HANDLING 3 17...
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Page 294: ...FIGURE 4 4 INTERCONNECT BLOCK DIAGRAM 4 4...
Page 295: ...FIGURE 4 6 TRACK O TIMING 4 5...
Page 304: ...FIGURE 5 2 TIMING DISK FIGURE 5 3 HUB CENTER LINE AND TRACK LOCATION 5 4...
Page 337: ...FIGURE 6 19 HEAD CARRIAGE 6 25...
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Page 373: ...FIGURE 3 5 RADIAL CONFIGURATION 3 7...
Page 374: ...FIGURE 3 6 DAISY CHAIN CONTROL LINES...
Page 382: ...FIGURE 3 11 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 1...
Page 383: ...FIGURE 3 11 CONTINUED RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 1 3 17...
Page 384: ...FIGURE 3 12 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 2 3 18...
Page 385: ...FIGURE 3 13 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 3 3 19...
Page 386: ...FIGURE 3 13 CONTINUED RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 3 3 20...
Page 387: ...FIGURE 3 14 LOAD GRAPH 3 21...
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Page 390: ...FIGURE 4 1 TEST POINT LOCATIONS...
Page 394: ...o FIGURE 4 3 READ DATA WAVEFORMS 15 TPR AND 14 TPR o 4 6...
Page 397: ...FIGURE 4 4 INDEX SENSOR 4 9...
Page 400: ...FIGURE 4 6 TRACK 0 ADJUSTMENT 4 12...
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