HP 9830 - Keyboard Interface

0.02
220
a
820
nKSCANDET
KR7
10
11
U32-16
nKC1
10
11
U32-5
DO12
8
9
U32-5
DO15
N34.10
N32.20
N34.K
N32.21
DO14
DO13
N34.9
N32.22
N34.J
N32.Z
KDBENB
N32.Y
N34.C
nKSTOP
1K
4
3
U32-5
1K
nSIH
N34.3
N32.M
KLS
N34.B
N32.19
100pF
N32.X
N34.4
nSSI
U32-13
1
3
5
U32-13
4
6
10
U32-12
9
8
2
1
U32-16
8
9
U32-16
2
U32-6
1
3
STOP KEY
CONTROL
KEY
PRESSED
CONTROL
KEY DATA
CONTROL
4 of
0.02
47
6V
12
13
U32-5
2
1
U32-5
6
5
U32-5
274
0.018
14
12
U32-2
7490
÷2
Q
6
5
U32-16
KEYPRESSED
REPEAT
OSCILLATOR
SCAN CLOCK &
KEYPRESS DETECTION
N34.N12
N34.A1,M11
N32-AA23
N32-A1,BB24
N31.1
N31.15
22
N31.4
2
1
3
U32-15
13
12
11
U32-15
9
10
8
U32-15
9
10
8
U32-9
5
4
6
U32-15
13
12
11
U32-13
2
1
3
U32-12
12
13
11
U32-9
1
2
3
U32-9
9
10
8
U32-13
4
5
6
U32-6
KSCANCLK
10
9
8
U32-6
13
12
11
U32-6
10
nS
U32-14
7474
9
Q
8
nQ
D
11
Cp
12
nR
13
4
5
6
3
2
1
nS
U32-14
7474
Q
nQ
D
Cp
nR
2
0.002
1K
220
5
4
6
U32-9
KSCANDET
HP 9830 Computer
Section: Keyboard Scan Logic
Page: K1 Rendition: 2014 Dec 26
Cn
DELAY BEFORE
REPEAT
KEYBOARD LOGIC
Assembly 32
12
U32-10
74123
1.7S
5
Q
nQ
11
R
10
9
6
7
18.2K
330
6V
4
U32-11
74123
11mS
13
Q
nQ
3
R
2
1
14
15
22.1K
1.8
6V
12
U32-11
74123
82mS
5
Q
nQ
11
R
10
9
6
7
28.7K
10
20V
a
a
4
U32-10
74123
14mS
13
Q
nQ
3
R
1
2
14
15
26.7K
1.8
6V
a