Tandy 6000 HD, Service Manual

Page: 284 / 416

READY AND TRUE READY (R AND TR)
DISK CHANGE (DC)
W h e n th e R ju m p e r is in s ta lle d , th e R e a d y
s ig n a l is a v a ila b le a t th e in te r fa c e . W h e n th e
T R ju m p e r is in s ta lle d , th e T r u e R e a d y s ig n a l
is a v a ila b le a t th e in te r fa c e .
T h e R ju m p e r is s ta n d a rd , w h ile th e T R
ju m p e r is o p tio n a l. T hese tw o lin e s a re in d e ­
p e n d e n t fu n c tio n s , a n d m a y be used s e p a ra te ly
o r to g e th e r.
R TR READY OR TRUE READY
X — R e a d y s ig n a l v ia J l- 2 2 .
— X T r u e R e a d y s ig n a l v ia J l- 8 .
N O T E
W h e n u s in g th e T r u e R e a d y
o p tio n , M o to r C o n tr o l 3 m a y n o t
be used.
LEVER LOCK OPTIONS (D, DL, LL, NL)
T h e le v e r lo c k s o le n o id , a n o p tio n a l fe a tu r e ,
c a n b e c o n tr o lle d b y th e I n U se in te r fa c e lin e
J l- 1 6 .
T h is o u t p u t is used to in d ic a te to th e c o n ­
t r o l l e r t h a t a d is k c h a n g e h a s b e e n m a d e . T h e
in t e r n a l s ig n a l is g a te d w i t h D r iv e S e le ct.
W h e n th e le v e r is opened, th e D is k C h a n g e
lin e goes lo w ( tr u e ) , a n d re m a in s lo w u n t i l th e
t r a i l i n g edge o f th e n e x t D r iv e S e le c t.
DC DISK CHANGE
— D is k C h a n g e s ig n a l n o t a v a ila b le .
X D is k C h a n g e s ig n a l a v a ila b le v ia
J l- 1 2 .
TWO-SIDED DISKETTE INSTALLED (2S)
W h e n a tw o -s id e d d is k e tte is in s ta lle d , i n t e r ­
n a l c i r c u i t r y g a te s t h is s ig n a l w i t h D r iv e
S e le c t. I t sends a lo w (tru e ) s ig n a l to th e
c o n tr o lle r , in d ic a t in g t h a t a d o u b le -s id e d d is k ­
e tte is in s ta lle d (in d e x h o le tw o is p re s e n t).
T h is o p tio n is f a c t o r y in s ta lle d .
2S TWO-SIDED DISKETTE
— T w o -s id e d d is k e tte s ig n a l n o t
a v a ila b le .
X T w o -s id e d d is k e tte s ig n a l a v a ila b le
v i a J l - 1 0 .
D DL LL NL LEVER LOCK
SOLENOID
— — — — L a tc h e d w it h D r iv e
S elect.
X X — X L a tc h e d b y I n U se
v ia J l- 1 6 , tr u e (lo w ).
A c t iv e e n e rg iz e s
so le n o id .
X X X - L a tc h e d b y I n U se
v ia J l- 1 6 . A c t iv e lo w ,
i n c o n ju n c tio n w i t h
D r iv e S e le c t, la tc h e s
th e s o le n o id . T h e
s o le n o id re m a in s
la tc h e d u n t i l I n U se
is fa ls e (h ig h ) o n th e
le a d in g edge o f D r iv e
S e le ct.
WRITE PROTECT (WP AND NP)
T h is W P o p tio n is used to lo c k o u t th e W r it e
G a te w h e n a w r it e p ro te c te d d is k e tte is
in s ta lle d . I t is f a c t o r y in s ta lle d .
T h e N P o p tio n a llo w s th e c o n t r o lle r to w r it e
on a n y d is k e tte , w h e th e r o r n o t i t is w r it e
p ro te c te d . I t does n o t s to p t h e W r it e P r o te c t
s ig n a l fr o m b e in g s e n t o n th e in t e r f a c e lin e .
T h is o p tio n is im p le m e n te d b y r e m o v in g W P ,
a n d i n s t a llin g N P .
WP NP WRITE PROTECT
X — D is a b le s W r it e P r o te c t, f o r
w r it e p ro te c te d d is k e tte .
— X A llo w s w r i t i n g o n a n y
d is k e tte .