Atari 800XL

PQT KEYboard Integrated
Circuit
( POKEY)
The
POKEY
is
a custom
Large
Scale I
ntegrated
circuit
( LSI
)
chip,
it
is used
for
audio
generation
,
Serial
Input/Output
(SIO)
Data
and
Clocks,
POT
Controller
interface
scan,
and
keyboard
scan.
Ground
VSS
1
•
40
D2
Data
Bus
D3
2
39
D1
Data
Bus
D4
3
38
D0
Data
Bus
D5
4
37
AUDIO
Data
Bus
D6
5
36
A0
Data
Bus
D7
6
35
A1
Phase
2
Clock
02
7
34
A2
Pot
Scan
P6
8
33
A3
Pot
Scan
P7
9
32
R/¥
Pot
Scan
P4
10
31
Pot
Scan
P5
11
30
Pot
Scan
P2
12
29
TEH
Pot
Scan
P3
13
28
SOD
Pot
Scan
P0
14
27
ACLK
Pot
Scan
PI
15
26
BCLK
Keyboard
Response
EE7
16
25
KR1
+5V Power
VCC
17
24
SID
Keyboard
Scan
Y5
18
23
w
Keyboard
Scan
W
19
22
K1
Keyboard
Scan
YJ
20
21
YZ
Data
Bus
Data
Bus
Data
Bus
Audio
Out
Address
Bus
Address
Bus
Address
Bus
Address
Bus
Read/Write
Chip
Select
Chip
Select
Interrupt
Request
Serial
Output
Data
Serial
Output
Clock
Bidirectional
Clock
Keyboard
Response
Serial
Input
Data
Keyboard
Scan
Keyboard
Scan
Keyboard
Scan
POKEY
13