Tandy 1000 SL Technical Reference Manual page 146

System C o n f i g u r a t i o n Register
FFEB
0
1
2
3
4
5
6
7
Non IBM C o m p a t i b l e Read/Write
Reserved
R e s e r v e d
R e s e r v e d
R e s e r v e d
R e s e r v e d
Read l=Keyboard I n t e r r u p t
Read
l = R e a l
Time
C l o c k
I n t e r r u p t
Write
l = E n a b l e Real-Time
clock
I n t e r
r
u p t
Read Keyboard S e l e c t
O=Tandy Keyboard
1 = 1 0 1 Enhanced Keyboard
Summary on t h e a c t i v e / f l o a t d a t a b i t s . (READ ONLY)
A d d r e s s N e t
N a m e
A c t i v e B i t s F l o a t B i t s
------- -------- -----------
----------
0065 CSEN XD 3 XDO-XD2, XD4-XD7
0 3F7
FDMDRDB XD7 XDO-XD6
FFEB CDENRDB XD5 XDO-XD4
XD6
XD7
14