Tandy 1000 SL Technical Reference Manual page 145

0 3F0
0 3 F 1
0 3F2
0
3F3
0 3F4
0
3F5
0
3F6
0
3F7
0
1
0
1
Description
-----------
Not used
FDC Mode Control
Not used
Write
-
Drive S e l e c t s w i t c h
0 = 0-0 1-1
1 = 0-1 1-0
Not used
N o t
used
N o t
used
N o t used
Not
u s e d
Not used
FDC D i g i t a l Output Register
(DOR)
Write Only
D S O DS1 D S 2
---
---
---
Write
-
0
l o
w r i t e
-
0 0 1
Write
-
FDC r e s e t
W r i t e
-
Enable DMA Req/Int.
Write
-
Drive 0 Motor ON
Write
-
Drive
1
Motor ON
N o t
used
N o t used
N o t used
FDC c h i p s e l e c t
FDC c h i p s e l e c t
N o t
used
FDC Data Rate S e l e c t i o n
N o t used
Write
-
Data Rate
0
= 500K b i t s per second
1 = 250K b i t s per second
N o t used
N o t u s e d
N o t used
Not used
N o t used
O = D i s k Change
13