Tandy 1000 SL Technical Reference Manual page 300

( f ) ( p i n 27)
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S c h m i t t TTL i n p u t
C o n t r o l i n p u t t e r m i n a l h a v i n g f o l l o w i n g two f u n c t i o n s . R e f e r t o
T a b l e 203.
i ) ON/OFF c o n t r o l
o f w r i t e
c u r r e n t
s e t t i n g
t e r m i n a l WCS1.
i i ) S e l e c t i o n of
erase
d r i v e r o u t p u t t e r m i n a l s EO0 a n d E01.
( g )
WD
( p i n 2 8 )
---
S c h m i t t
'IT5
i n p u t
WRITE D A T A i n p u t t e r m i n a l from t h e h o s t c o n t r o l l e r
SV,
a p p r o x .
- l n n r l r
Write Read
-
( h )
WG
( p i n 2 9 ) , E G ( p i n 30)
---
S c h m i t t TTL i n p u t
C o n t r o l i n p u t t e r m i n a l s f o r w r i t e permit
(WG) a n d
erase
p e r m i t ( E G )
from t h e c o n t r o l c i r c u i t i n t h e FDD.
R e f e r t o T a b l e s 202 a n d 203.
(5) O t h e r s
( a )
( p i n 31)
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S c h m i t t TTL i n p u t
I n p u t t e r m i n a l f o r c o n t r o l l i n g t h e s i d e s e l e c t i o n from t h e c o n t r o l
c i r c u i t . The t e r m i n a l f u n c t i o n s
a s
t h e
selector
f o r common d r i v e r
o u t p u t s COMO/COMl a n d f o r head s w i t c h m a t r i x o f R W O O , O ~ / R w 10,ll
terminals.
R e f e r t o T a b l e
203.
(b)
E
( p i n 32)
---
Open c o l l e c t o r
TTL
o u t p u t
-
LVS s i g n a l o u t p u t t e r m i n a l
t o
t h e c o n t r o l c i r c u i t o f t h e FDD. R e f e r
t o i t e m
2-2-1-4.
-
221
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