Cpu Clock & I/O Assembly - HP 9830 Schematic

CPU CLOCK & I/O
Assembly 12
8.000 MHz
1K
N12B.C3
nIHC
N13B.3
2
?
U12-11
1
3
1K
1.8K
1K
N12A.J
XTC
N13A.12
N12A.B2
22 9 of
15V 0.01
N11A.A1
B.R14
B.S15 12
1K 1K
13
b c
HP 9830 Computer
Section: CPU Clock
Page: P1 Rendition: 2014 Dec 26
MCK nMCK
5 9 12
U12-11 U12-11 U12-11
4 10 13
6 8 11
1K
1.8K
U12-10
11
14 U12-14
R
74193
5 5
CUp TCU
1
12
U12-5
4 4
6
U12-5 CDp TCD
2
3 13
11
nLD
15
CC1 D0 Q0
nnMCK
3
1
CC2 D1 Q1
2
10
CC4 D2 Q2
6
9
CC8 D3 Q3
7
nINH
N12A.M
nIPS
N13A.M
nCEM
QRD
13
nQN
2
U13-4
12
1
IQN
b b
4 10
U12-6 U12-6
nS nS
74H74 74H74
2 12
D Q D
5
3 11
Cp Cp
1 b 13
nR nQ nR
6
12
1K
U12-5
13
11
5
U12-2
4
6
13
10 10
1K
12 U12-12 12 U12-13
8
9 13
9 4
U12-5
10 1
8
2 U12-12
6
5
N12A.15 nCCO
N13A.S
N22A.K
MCK
N12A.F6
N13A.F
N14A.15
(N02.7)
Q
9
nQ
8
N22A.L
nCCT
N12A.8
N14A.16
IOCKT
IOCK1
IOCK2
9
N13A.13
RCK
8 N12A.N12
N14A.13
N13B.N12
N12B.N12
1
2
N13A.K
4 U12-13 SCK
6 N12A.K9
N14A.9
5
N22A.7
N23A.8
(N02.J)