Texas Instruments 99/4A - Page 67

9901 INPUT/OUTPUT MAP
ADDRESS
CRU BIT
PORT DESIGNATION
PIN
FUNCTION
0000 0
CONTROL
CONTROL
0002
1 INTERRUPT 1 17
EXTERNAL
0004
2 INTERRUPT 2
18
VDP VERTICAL SYNC.
0006 3
INTERRUPT 3
9 KEYBOARD: :/.,MN=
JOYSTICK: FIRE
0008
4
INTERRUPT 4
8 KEYBOARD: ;LKJH SPACE
JOYSTICK: LEFT
OOOA 5 INTERRUPT 5
7
KEYBOARD: POIUY ENTER
JOYSTICK: RIGHT
OOOC
6
INTERRUPT 6
6
KEYBOARD: 09876
JOYSTICK: DOWN
OOOE 7
INTERRUPT 7 (P15)
34
KEYBOARD: 12345
JOYSTICK: UP
0010
8
INTERRUPT 8 (P14)
33
KEYBOARD: ASDFG SHIFT
0012
9
INTERRUPT 9 (P13)
32
KEYBOARD: QWERT
0014 10
INTERRUPT 10 (P12)
31
KEYBOARD: ZXCVB
0016
11 INTERRUPT 11 (Pll)
30
NOT USED
0018 12 INTERRUPT 12 (P12)
29
RESERVED
001A - IE 13 - 15
INTERRUPT 13 - 15
28,27 NOT USED
& 23
0020 16
PROGRAMMABLE 0
38
NOT USED
0022
17
PROGRAMMABLE 1
37
NOT USED
0024
18
PROGRAMMABLE 2
26
BIT 2 OF KEYBOARD SELECT (LSB)
0026 19
PROGRAMMABLE 3
22 BIT 1 OF KEYBOARD SELECT
0028
20 PROGRAMMABLE 4
21
BIT 0 OF KEYBOARD SELECT (MSB)
002A 21
PROGRAMMABLE 5
20
ALPHA LOCK KEY
002C
22
PROGRAMMABLE 6
19
CASSETTE MOTOR CONTROL 1
002E
23
PROG. 7 / INT. 15
23
CASSETTE MOTOR CONTROL 2
0030
24
PROG. 8 / INT. 14
27
AUDIO GATE
0032
25 PROG. 10 / INT. 12
28
MAG TAPE DATA OUT
0036 27
PROG. 11 / INT. 11
30
MAG TAPE DATA INPUT
0038 - 3E 28 - 32
PROG. 12 - PROG. 15
31-34
NOT USED
TABLE 8
58