Tandy 1000 SL Technical Reference Manual page 151

ADDRESS PORT EQUATIONS
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/* */
/*
AND DECODE LOGIC
*/
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/*
Allowable T a r g e t Device Types: F153
*/
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/*
KEYBOARD, T I M E R CONTROL, I N T E R R U P T CONTROL, FDC-DOR
*/
/**
P I N
P I N
P I N
P I N
P I N
P I N
P I N
/**
P I N
P I N
P I N
P I N
P I N
P I N
P I N
P I N
P I N
PIN
/**
I n p u t s
**/
1 = saOl
;
2 = saOO
I
3 = s a 0 2
I
4
= !iow
;
5
= ! i o r
I
6 = ! f d c p o r t ;
7
= !keyport
;
o u t p u t s
**/
9 =
11 =
1 2 =
1 3
=
1 4
=
1 6
=
1 7
=
18 =
1 9 =
15 . =
!
f dmdrd
! fdmdwt
!fdcchp
d o r l t c h
drvsck
wr
i
t d p
C P
bP
r eadap
csen
I
I
I
I
I
I
I
;
;
I
Logic Equations
**/
/*
System a d d r e s s
1
*/
/*
System a d d r e s s 0
*/
/*
System a d d r e s s 2
*/
/*
I / O Write
*/
/*
1/0 Read
*/
/ *
FDC P o r t 03FO-03F8 hex
*/
/*
Keyboard P o r t
0 0 6 0
-
0 0 6 7
*/
/*
/ *
/*
/*
/*
/ *
/*
/*
/*
/*
Read FDC P o r t 03F7 hex
*/
Write FDC P o r t 03F7 hex
*/
W r i t e DORLTCH P o r t 03F2
*/
P o r t 0 0 6 2 o r C
*/
P o r t 0 0 6 1 o r B
*/
Read P o r t 0060
*/
FDC Chip S e l e c t 03F4
-
03F5
*/
W r i t e P o r t 03F1 Driveswitch
*/
Write Keyboard P o r t 0 0 6 7 o r D*/
Chip S e l e c t Enable P o r t 0065
*/
fdmdrd = f d c p o r t
&
sa02
&
saOl
&
saOO
&
i o r ;
fdmdwt = f d c p o r t
&
s a 0 2
&
saOl
&
saOO
&
iow;
fdcchp = f d c p o r t
&
sa02
&
!saOl;
! d o r l t c h = f d c p o r t
&
iow
&
!sa02
&
saOl
&
!saOO;
!drvsck = f d c p o r t
&
iow
&
!sa02
&
!sa01
&
saOO;
!readap = keyport
&
i o r
&
!sa02
&
!sa01
&
!saOO;
bp = keyport
&
!sa02
&
! s a 0 1
&
saOO;
cp = keyport
&
!sa02
&
saOl
&
!saOO;
csen = keyport
&
sa02
&
!sa01
&
saOO;
1 9