Typical Interface Characteristics; Power; P O W E R C O N N E C To R P In A S S Ig N M E N Ts - Tandy 6000 Service Manual

DISK CHANGE
T h is s tra p p a b le fe a tu r e p ro v id e s a tr u e (lo w )
s ig n a l to th e in te r fa c e w h e n D r iv e S e le ct is a c ­
tiv a te d i f th e d r iv e h a s go ne fr o m a R e a d y to a
N o t R e a d y c o n d itio n w h ile deselecte d. T h is
lin e is re s e t on th e tr u e - to -fa ls e tr a n s it io n o f
D r iv e S e le c t i f th e d r iv e h a s gone to a R e a d y
c o n d itio n .
TWO-SIDED
T h is o p tio n is a v a ila b le
T M 8 4 8 -2 E . T r u e (lo w ) in d ic a te s t h a t a tw o -
sid e d d is k e tte is in s ta lle d .
TYPICAL INTERFACE
CHARACTERISTICS
L in e s b e tw e e n th e c o n tr o lle r a n d th e d r iv e
h a v e th e f o llo w in g c h a ra c te ris tic s :
V . T ru e = + 0.4 v o lt m a x im u m a t I ,
out
= 48 m illia m p e r e s , m a x im u m
V out F a ls e = + 2 .4 v o lts m in im u m open
c o lle c to r a t I , = 250
m ic ro a m p e re s , m a x im u m
o n ly on M o d e l
out
out
FIGURE 3-1
ELECTRICAL INTERFACE CHARACTERISTICS
3-6
F ig u r e 3-1 c o n ta in s th e e le c tr ic a l in te r fa c e
c h a ra c te ris tic s . F ig u r e 3-2 c o n ta in s th e c o n tr o l
a n d d a ta t im in g re q u ire m e n ts .
c.
3.5 .

POWER

d
D . C. p o w e r is s u p p lie d to th e d r iv e th r o u g h a
s ix - p in A M P c o n n e c to r, J2, m o u n te d o n th e
c ir c u it b o a rd . T h e m a t in g
s u p p lie d , is A M P P a r t N u m b e r 1 -4 8 0 2 7 0 -0 ,
u s in g A M P c o n ta c t P a r t N u m b e r 6 0 6 1 9 1 -1 .
P in a s s ig n m e n ts a re fo u n d in T a b le 3-2.
T h e ch assis s h o u ld be co n n e c te d to
g ro u n d to e n s u re p ro p e r o p e ra tio n .
TABLE 3-2
D. C. POWER CONNECTOR
PIN ASSIGNMENTS
P in
S u p p ly V o lta g e
1
+ 24 v o lts D . C.
2
3
5
6
c o n n e c to r, n o t
e a r th
2 4 v o lts R e tu r n
5 v o lts R e tu r n
+ 5 v o lts D . C.
R e tu r n