Tandy 1000 SL Technical Reference Manual page 67

NOTE: When reading Port FFEA, Bit
4
will be inverted from what
was written, (i.e. when a
0
is written, a
1
will be read; when a
1
is written, a
0
will be read.)
ROM Paging Definition:
Two
2
Meg ROMs ADDRESS
(Two 1
Meg ROMS)
19
18
17
F0000-FFFFF
1 1 1
E0000-EFFFF
1 1 1
E0000-EFFFF
1 1 1
E0000-EFFFF
1 1 1
E0000-EFFFF
1 1 1
E0000-EFFFF
1 1 1
E0000-EFFFF
1 1
1
E0000-EFFFF
1 1 1
E0000-EFFFF
1 1 1
ROM PAGES
16 4 3 2 1 0
1 x x x x x
0 1 x 1 1 1
0 1 x 1 1 0
0 1 x 1 0 1
0
1 x 1 0 0
0 1 x 0 1 1
0 1 x 0 1 0
0
1 x 0 0 1
0 1 x 0 0 0
ROMC
S
#O #1
0 1
1 1
0 1
0 1
0 1
1 0
1 0
1 0
1 0
TWO
4
Meg ROMS
F0000-FFFFF
EO
0 0 0-
EFFFF
EO
0
00-EFFFF
EO
0 0 0-
EFFFF
E0000-EFFFF
EO0
0
0-EFFFF
EO
0 0
0-EFFFF
EO
0 0
0-EFFFF
EO
0 0
0-EFFFF
EO
0 0
0-EFFFF
E0000-EFFFF
EO0 00-EFFFF
EOO 0 0-EFFFF
EO 0 0 0-EFFFF
EO
0
0 0- EFFFF
~0000-EFFFF
EO0 00-EFFFF
19 18 17 16 4 3 2 1 0 #O #1
1 1 1 1
x x x x x 0 1
1 1 1 0
0 1 1 1 1 1 1
1 1 1 0 0 1 1 1 0 0
1
1 1 1 0
0 1 1 0 1 0 1
1 1 1 0
0 1 1 0 0
0
1
1 1 1 0 0 1 0 1 1 0
1
1 1 1 0 0 1 0 1 0
0
1
1 1 1 0 0 1 0 0 1 0
1
1 1 1 0 0 1 0 0 0
0 1
1 1 1 0 0 0 1 1 1
1 0
1 1 1
0 0 0 1 1 0
1 0
1 1 1 0 0 0 1 0 1 1 0
1 1 1 0 0 0 1 0 0 1 0
1 1 1 0 0 0 0 1 1 1 0
1 1 1
0
0 0 0 1 0 1 0
1 1 1 0 0 0 0 0 1 1 0
1 1 1 0 0 0 0 0 0 1 0
FFEB UART Clock, Joystick, and Sound Enable
Bit Description
0 0 =
Clock divided by
13
1 0 =
Disable Joystick
2
0 =
Disable Sound Chip
1 = Clock Divided by 1
1 =
Enable Joystick
1 =
Enable Sound Chip
SELECT
2 1 0
x l l
x 1 0
x x l
x o o
x l l
x 1 0
x o 1
x o o
x x x
2 1 0
1 1 1
1 1 0
1 0 1
1 0 0
0 1 1
0 1 0
0 0 1
0 0 0
1 1 1
1 1 0
1 0 1
1 0 0
0 1 1
0 1 0
0 0 1
0 0 0
x x x
64K
Page
ROM
0
ROM
1
1
2
3
4
1
2
3
4
ROM
0
ROM
1
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
56