1 . 0 General; Pin List - Tandy 1000 SL Technical Reference Manual

1 . 0 GENERAL
1.1 F u n c t i o n a l D e s c r i p t i o n
T h e PSSJ T a n d y ASIC i s c o n t a i n e d i n a 6 8 p i n PLCC p a c k a g e , a n d
comprises t h e P r i n t e r p o r t ,
a
S e r i a l (RS232) p o r t , t h e Sound
f u n c t i o n , a n d t h e J o y s t i c k f u n c t i o n of t h e T a n d y 1 0 0 0 c o m p u t e r s .
2.0 PIN L I S T
PIN NAME PIN
NO.
DRIVE DESCRIPTION
vc c
1 , 3 5
--
Power i n p u t s
VBB
5 9
--
A n a l o g Power i n p u t
GND
1 8 , 5 2
--
G r o u n d s
RST 2 5
CLKl4M 2
CLK2IN 37
TTL i n S y s t e m r e s e t s i g n a l ,
a c t i v e h i g h .
TTL i n C l o c k s i g n a l i n p u t ,
1 4 . 3 1 3 1 3 MHz, 5 0 % d u t y
c y c l e .
TTL i n C l o c k s i g n a l i n p u t ,
e i t h e r 2 4
MHz
or
1 . 8 4 3 2 MHz, 5 0 %
d u t y
c y c l e .
IODO
-
IOD7 1 4 , 1 5 , 1 6 , 1 7 DS1218, E i g h t b i t p e r i p h e r a l d a t a
1 9 , 2 0 , 2 1 , 2 2 8
mA
TS b u s i n t e n d e d t o d r i v e 5
XT t y p e
1/0
s l o t s , a s
w e l l a s a l l o n b o a r d
p e r i p h e r a l s .
I OR-
I
ow-
1 0
11
A0
-
A2, A7 6 , 7 , 8 , 9
cso
-
c s 2 3 , 4 , 5
PINT 1 2
TTL i n CPU/DMA
1/0
Read s i g n a l ,
a c t i v e l o w . S y s t e m
c o n t r o l l i n e .
DS1218 CPU/DMA
1/0
Write s i g n a l ,
a c t i v e low. S y s t e m
c o n t r o l l i n e .
TTL i n
S y s t e m a d d r e s s l i n e s .
TTL i n A d d r e s s d e c o d e i n p u t s .
2 mA TS P r i n t e r I n t e r r u p t ,
t r i s t a t e .
1