Tandy 1000 SL Technical Reference Manual page 143

R e g i s t e r D e f i n i t i o n :
I n t e r r u p t
0 0 2 0
0 0 2 1
0 0 2 2
-
0 0 2 7
Timer
0 0 4 0/0 0 4 4
0 0 4 1 / 0 0 4 5
0042/0 0 4 7
-
I n i t i a l i za t ion Command
Word 1
-
I n i t i a l i z a t i o n Command
Word
2
Not used
. . .
T i m e r
-
Timer
T i m e r
-
Note:
-
= r e f e r s t o system
1/0
maps.
PPI/Keyboard
Address Range Hex
0 0 6 0
-
P o r t
A
-----------------
B i t
0061
-
P o r t
B
D e s c r i p t i o n
Keyboard Read Data I n p u t
Read o n l y Keyboard b i t
0
LSB
Read o n l y Keyboard b i t 1
Read o n l y Keyboard b i t
2
Read o n l y Keyboard b i t
3
Read o n l y Keyboard b i t
4
Read o n l y Keyboard b i t 5
Read o n l y Keyboard b i t
6
Read o n l y Keyboard b i t
7
M S B
-----------
Read/Write
R/W T i m e r
g a t e
1 2
e n a b l e
R/W
Speaker d a t a o u t e n a b l e
R/W
n o t used
R/w
n o t used
R/W
l = d i s a b l e i n t e r n a l s p e a k e r
R/W
n o t used
R/W HOLDCK
R/W
l=keyboard c l e a r
11