Tandy 1000 SL Technical Reference Manual page 61

A d d r e s s D e s c r i p t i o n
0 3F3 N o t Used
0
3F4 FDC
-
S t a t u s
( R e a d O n l y )
See
FDC S p e c i f i c a t i o n
03F5 FDC
-
D a t a (R/W) See FDC
S p e c i f i c a t i o n
03F6-03F7 R e s e r v e d
03F8-03FF S e r i a l P o r t P r i m a r y (COM1)
0 3F8
Write
T r a n s m i t t e r H o l d i n g R e g i s t e r ( C h a r a c t e r
t o s e n d )
B i t D e s c r i p t i o n
0 B i t 0
-
LSB ( F i r s t B i t S e n t S e r i a l l y )
1 B i t 1
2
B i t
2
3 B i t 3
4 B i t 4
5 B i t 5
6 B i t 6
7 B i t 7
-
MSB
0 3F8
0 3F8
Read R e c e i v e r B u f f e r R e g i s t e r ( C h a r a c t e r R e c e i v e d )
B i t D e s c r i p t i o n
0 B i t 0
-
LSB ( F i r s t B i t R e c e i v e d
S e r i a l l y )
1 B i t
1
2
B i t 2
3
B i t 3
4
B i t 4
5 B i t 5
6 B i t 6
7 B i t 7
-
MSB
D i v i s o r L a t c h LSB ( D i v i s o r L a t c h A c c e s s B i t DLAB
= "1")
B i t D e s c r i p t i o n
0 B i t
0
1 B i t 1
2 B i t 2
3
B i t 3
4 B i t 4
5
B i t 5
6 B i t 6
7 B i t
7
50