Canon 161 User manual

Canon 161
Calculator
Contents
Section Page
Title & Contents (this page) 1
Notes & Signal Names 2
Block Diagram 3
Modules - Gates & Display 4
Modules - Flip-Flops 5
Timing 6
Keyboard 7
Control State Machine 8
Flags F–, FS, FX, F÷, FO 9
Flags FG, FH, FZ, FCO, FCU 10
FM Flag & Shift Pulse Generators 11
Counter Enable Flags FA, FB, FD, FP 12
A & B Counters (AC & BC) 13
Point Counter (PC) 14
Digit Counter (DC) 15
Arithmetic & ACC Register 16
IR Register 17
ME Register & Zero Gates 18
Power Supply 19
Timing Diagram 20
Connectors Nbb1p & Nbb2p 21
Connectors Nbb3p & Nbb4p 22
Board Layout - 30::33 23
Board Layout - 34::37 24
Board Layout - 38::40 25
Controller/Monitor Unit (CMU) CMU.1
CMU Operation CMU.2
Canon 161 Calculator
Section: Title & Contents
Page: 1 Rendition: 2022 Feb 6
This schematic has been derived
through the reverse engineering
of a Canon 161 calculator.
This is not the manufacter’s
schematic, nor based on the
manufacturer’s schematic.
Prepared by bhilpert.

Canon 161 Calculator
Section: Notes
Page: 2 Rendition: 2022 Feb 6
Signal Names
Signal names are based on the labels on the printed circuit boards.
Section Signal Description
Timing CP Master clock.
T-… Bit timing (4 bits constitutes a digit).
TD… Digit timing to count out a number cycle. Clocking of the TD counter is controlled by FM.
FL TD16 delayed one clock period.
Used in part to trigger state transitions at the end of number cycles.
Keyboard K… Keyboard signals.
W1,W2,W4,W8 Signals from the keyboard numeral encoder to the IR register.
Control CC0::CC7 The states of the state machine.
F… Flag (single-bit) registers.
F– A subtract operation is pending or active.
FS DIrects Arithmetic to perform subtract rather than add.
FX A multiply operation is pending or active.
F÷ A divide operation is pending or active.
FO Overflow / error flag.
FG - In CC4 of multiplication, indicates shift period of final digit to adjust product.
- Indicates divide pending while dividend is shifted up.
- In division, transfers termination indication in CC4.
FH - Used to catch an occurrence of AC=0 during CC1 for DP alignment.
FZ - In CC3 of multiplication, indicates to add multiplicand digits of IR to ACC.
- In CC4 of multiplication, indicates to shift multiplicand digits of IR.
- In division, records termination event from CC3.
FCO Sign from last operation-result arithmetic (out of CC3).
FCU Sign from last totalising arithmetic (out of CC6).
FM Controls clocking of the registers and TD,A,B,D & P Counters.
FA Controls clocking of the A Counter.
FB Controls clocking of the B Counter.
FD Controls clocking of the D Counter.
FP Controls clocking of the P Counter.
IR Register IR… Indicating Register. The operand being displayed.
IR Bit stream output.
IR15D=0
IR16D=0
ACC Register ACC… Accumulator, contains the second operand.
Arithmetic is incorporated in this register.
ACC Bit stream output.
ACC15D=0
ACC16D=0
ME Register ME… User memory controlled by the A switch and T key.
ME Bit stream output.
ME15D=0
ME16D=0
P Counter PC… Point Counter. Holds the position of the displayed decimal point.
PC=0
D Counter DC… Digit-Mark Counter. Holds the position of the multiply digit marker.
DC=0
A Counter AC… Counter to calculate the difference in DP positions between IR and ACC.
AC=0
B Counter BC… Counter to recover the DP position of a recalled operand.
BC=0
♦A lowercase “n” in a signal name indicates the logical NOT operation.
Notes
♦Gate symbols and signal names are presented in accordance with:
logic 0 = 0V, GND, E
logic 1 = –10V
♦The symol
N bbcp
denotes a physical connector pin. bb =board, c =connector, and p =pin. Solid black end is the
male side of the connector. White end is the female side of the connector.
♦Arrows indicate direction of signal or energy flow.
♦The symbol with no label denotes –10V.
♦The symbol with no label denotes +10V.
♦Capacitance in microfarads unless otherwise indicated.
♦See the associated Theory of Operation document.
A blue dot in these drawings indicates the associated element is referenced by name in that document.
♦Display lamps are 12V / 70mA (based on measurement).
♦These drawings based on unit with Serial No. 700369.
Revision Log
♦2000 Dec: Initial drawing / bhilpert.
♦2019 Jan: Format revisions / bh.
♦2021 Nov: - Corrections re MJ: Timing diagram scale corrected, nK(E+S)-->K(E+S) at B Counter.
- Monostable diagrams reorganised / bh.
- Initial version of State Diagram added.
- Numeral-entry & addition procedure descriptions added.
- Corrections to F÷, FG, FZ flags: JK input sources were swapped.
- Correction to gate 38A20: F÷ corrected to nF÷.
♦2021 Dec: - Flags reorganised.
- Correction to signal direction between 36A34 & 36O20.
- DP alignment description added.
- Gate names corrected:
30O1 => 34O9
30B5 => 34B3
31V5 => 34V12
34A45::49 => 37A45::49
34A47 => 36A47
A4 => 32A11
36B6 => 35B8
37A14 => 34A30

KC, KCI, KCM,
KA, KT, KP, KR
KE, KS, KX, K÷
–10(K)
+10V
ME Register
(User Memory, 64 bits)
ACC Register
(Accumulator, 2nd Op, 64 bits)
16 Incandescent Displays
Canon 161 Calculator
Section: Block Diagram
Page: 3 Rendition: 2022 Feb 6
CP
T- n
bit timing
TD n
digit timing
–10V
Keyboard
Control
CA
Arithmetic
(serial adder)
FA
Flag
FS
Flag
FX
Flag
FZ
Flag
FO
Flag
State
Machine
CC0
CC7
Timing
Numeral
Encoder
K0…K9
W1,W2,W4,W8
KN
Overflow
Lamp
logic supplies
display supply
–V(L)
Power Supply
6543210987654321.
16 1-of-10 Decoder/Drivers
FG
Flag
FH
Flag
F÷
Flag
FCO
Flag
FCU
Flag
1-of-16
Decoder/Drivers
1-of-16
Decoder/Drivers
A Counter
(4 bits)
AC=0
B Counter
(4 bits)
BC=0
ACC16D=0
ACC15D=0
PC=0
DC=0
K…, F…, CC…
to all sections
ME16D=0
ME15D=0
MSD=0
IR16D=0
IR15D=0
IR Register
(Indicating Register, 64 bits)
FB
Flag
F–
Flag
TD (Time Digit)
Counter
(5 bits)
FM
Flag
FM
P Counter
(Point, 4 bits)
D Counter
(Digit, 4bits)
FP
Flag
FD
Flag

T
B329
Canon 161 Calculator
Section: Modules - Gates & Display
Page: 4 Rendition: 2022 Feb 6
AND Gates
OR Gates
C
1.5n
Inverters
Buffers
R
5.6K
B221
D77
R
R
R
130K
R
12K
AND gate with controlled pull-up.
Used in marker decoders.
OR gate with controlled pull-down.
Used in marker decoders.
Distributed OR gate.
t R
03.9K
14.7K
25.6K
bbAn-t
t R
04.7K
15.6K
28.2K
4 33K
6 300K
7 330K
bbOn-t
RL
3K
T
B329
RB
51K
12K
1t Variations
10
11 T=A538
12 T=B222
13 R=3K
14 R=3K T=B222
15 R=2K T=B222
16 R=2K B=221
17 R=5.6K to E
D77
R
2K
R
22
B77
N bbcp
n1
n2
n4
n8
1
n2
n4
n8
n1
2
n4
1
2
n4
n1
n2
4
1
n2
4
n1
2
4
1
2
4
1
n1
2
n2
4
n4
8
n8
–2V
d -0
B77
N bbcp
d -1
B77
N bbcp
d -2
B77
N bbcp
d -3
B77
N bbcp
d -4
B77
N bbcp
d -5
B77
N bbcp
d -6
B77
N bbcp
d -7
B77
N bbcp
d -8
B77
N bbcp
d -9
–V(L)
n1
8
1
8
d = digit (16 to 1)
bb = board (30,31,32,33,34)
c = connector (3,4)
p = pin (A to Z)
bbAdd0
-2
bbAdd1
-2
bbAdd2
-2
bbAdd3
-2
bbAdd4
-2
bbAdd5
-2
bbAdd6
-2
bbAdd7
-2
bbAdd8
-2
bbAdd9
-2
1
n1
2
n2
4
n4
8
n8
Display
n8
Display
8
n4
4
n2
2
n1
1
tVariations
0C=none
1
2C=none RL=1.8K
3RL=1.8K
4C=none RL=820
5RL=820
6C=none T=A538
7C=1nF T=A538
8C=none RL=1.8K T=A538
9C=1nF RB=68K T=A538
0t Variations
01 R=1K
Notes
•Gates are identified with a label of the form:
bbgn-t
where:
bb = board [30-40]
g = gate type (And,Or,inVerter,Buffer)
n = enumeration
t = type variation (see tables above)
•Logic 0 = 0V, GND, E
Logic 1 = –10V
bbBn-0t
bbVn-t
bbBn-1t
bbBn-D
bbAn-t
R
bbOn-t
R
bbOn-t

CFF
1.5n
RL
1.8K
T
B328
B329
2 •
39K
RFF
10K
CFF
1.5n
nQ
Q
J
33K
33K
RL
1.8K
C
K
T
B328
B329
1.5n
1.8K
10K
2n
nQ
1.8K
Type MEMC
Monostable,
nQ normally 1,
nQ goes 0 if ME=1 on 1-to-0 edge of MC.
(Used by SP- x shift-pulse generators.)
39K
B329
B329
220
1.5n
5
25V
12K
33K
MC
ME
680p
220
1.5n
5
25V
33K
T
CT
680p
CT
680p
33K
ME
nQ
MC
CJK
680p
CJK
680p
S
RC
R
SC
D
C
CD
680p
CD
680p
33K
33K
nTE
RTE
33K
CTC
470p
TC
Flip-Flop Input Options
Q
nQ
i
Q
i
nQ
Jnr
RFF
10K
Canon 161 Calculator
Section: Modules - Flip-Flops
Page: 5 Rendition: 2022 Feb 6
680p
CR
680p
33K
33K
0.68
1.8K
B329
1.5n
130K
1.8K
B329
22K
50n
33K
1.5n
39K
Q
SP- x
Q
MC
OS.ST
MC
Name
nS
RC
nR
SC
330p
680p
33K
33K
Section Name Types Variations Section Name Types Variations
Timing
Arithmetic
Arithmetic
FB1 TCA D, nR
FB2 T
ACC Register
ACC Register
FD1 TETC, S RTE=22K CTC=680pF S1 DCD=470pF CFF=1nF RFF=12K RL=3K
FD2 T, S S2 DCD=470pF CFF=1nF RFF=12K RL=3K
FD4 T, S S3 DCD=470pF CFF=1nF RFF=12K RL=3K
FD8 T, S S4 JK CJK=470pF CFF=1nF RFF=12K RL=3K
FD16 T, S ACC11-8 DCD=470pF CFF=1nF RFF=12K RL=3K
FL DACC5-8 DCD=470pF CFF=1nF RFF=12K RL=3K
KeyboardKeyboard ACC*-* JK CJK=470pF CFF=1nF RFF=12K RL=3K
OS.ST MC
IR Register
IR Register
FK DIR16-8 D
OS nS, nR IR16-4 D
Control IR16-2 D
FA JK IR16-1 D
F– JK IR2-8 D
FS JK IR1-8 D, S
FX JK CJK=470pF CFF=1nF T=A538 IR1-4 JK, S
F÷ JK IR1-2 JK, S
FO JK IR1-1 JK, S
FM JK IR*-* JK
FG JK
ME Register
ME Register
FH JK ME16-8 DCD=470pF CFF=1nF RFF=12K RL=3K
FP JK ME*-* JK CJK=470pF CFF=1nF RFF=12K RL=3K
FZ JK
Shift Pulse Generators
Shift Pulse Generators
Shift Pulse Generators
FCO JK CJK=470pF CFF=1nF T=A538 SP-A MEMC
FCU JK SP-M MEMC
FC1 JK, TETC RTE=22K SP-I MEMC
FC2 JK, TETC RTE=22K
PC Counter
PC Counter
FC4 JK, TETC PC1 JK, R CJK=820pF
AC Counter
AC Counter
PC2 T, R CT=820pF
AC1 JK, R CJK=330pF T=A538 PC4 T, R CT=820pF
AC2 TETC, R PC8 T, R CT=820pF
AC4 TETC, R
DC Counter
DC Counter
AC8 TETC, R FD JK
BC Counter
BC Counter
DC1 JK, R CJK=820pF
FB JK CJK=470pF CFF=1nF T=A538 DC2 T, R CT=820pF
BC1 JK, R CJK=470pF CR=470pF T=B221 DC4 T, R CT=820pF
BC2 TETC, R CR=470pF T=B221 DC8 T, R CT=820pF
BC4 TETC, R CR=470pF T=B221
BC8 TETC, R CR=470pF T=B221
Type JK
No change if J=0 and K=0.
Q goes 1 if J=1 and K=0 on 1-to-0 edge of C.
Q goes 0 if J=0 and K=1 on 1-to-0 edge of C.
Toggle Q if J=1 and K=1 on 1-to-0 edge of C.
Types S and R
Q goes 1 if S=1 on 1-to-0 edge of SC.
Q goes 0 if R=1 on 1-to-0 edge of RC.
Type D
Q follows D on 1-to-0 edge of C.
Type T
Toggle Q on 1-to-0 edge of T.
Type TETC
Toggle Q if nTE=0 on 1-to-0 edge of TC.
Types nS and nR
Q goes 1 if nS=0 on 1-to-0 edge of SC.
Q goes 0 if nR=0 on 1-to-0 edge of RC.
Type MC
Monostable,
Q normally 0,
Q goes 1 on 0-to-1 edge of MC.
(Used by OS.ST pulse generator.)
Flip-Flops
10K
MC2
Note: Logic 0 = 0V, GND, E
Logic 1 = –10V

Canon 161 Calculator
Section: Timing
Page: 6 Rendition: 2022 Feb 6
2n
A205
82K
910
100
1.5n
30
15V
82K
910
82K
500p
82K
A204
A205
A205
D77
100
1.5n
30
15V
P.G
N302W
N321K
N331Y
N341E
N351W
N371E
N381B
N391C
N401C
NTZ
TEST
NML
N343Z
CP
N302N
CP-OUT
NTY
FD4
Q
T
nQ
S
SC
FD8
Q
T
nQ
S
SC
FD16
Q
T
nQ
S
SC
N381P
TD1
N372B
n2
n4
n8
n16
n1
N381R
TD15
N302D
2
4
8
n16
n1
N381V
TD16
N352S
2
4
8
n16
1
FD2
Q
T
nQ
S
SC
FD1
Q
nQ
S
SC
2
n2
4
n4
8
n8
n16
1
n1
CP
FB1
Q
T
nQ
FB2
Q
T
nQ
T-1
N302P
1
n1
2
n2
1
n2
T-4
N302R
1
2
T-8
N302S
n1
n2
P-8
N302H
2
N343C
N372C
N361T
N382V
NTX
N364X
N381W
N402B
N341T
N351U
N381A
N391K
N372A
N381C
N361M
N402L
N402M
CP
FL
D
Q
C
N382U
N331R
FL
nQ
nFL
TD0
N342J
N372D
nTE
TC
T-1
T-8
T-9
38A1
38A2
38A3
30A1
30A2
30A3
nFM
P-8
30B1
30B2
30B3
30B4
34B3-11
34O9
38B1
38B2
38B3

N301Z
KN
N352V
N392C
30O6-1
0
1
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
2
DP
N301M
Canon 161 Calculator
Section: Keyboard
Page: 7 Rendition: 2022 Feb 6
W1
1
3
5
7
9
2
3
6
7
4
5
6
7
8
9
A
W2
W4
W8
3
4
5
6
0
1
2
7
8
9
5.6K
5
25V
CC1
TD15
5.6K
5
25V
5.6K
5
25V
5.6K
5
25V
5.6K
5
25V
5.6K
5
25V
5.6K
5
25V
5.6K
5
25V
5.6K
5
25V
5.6K
5
25V
N301N
N301P
N301R
N301S
N301T
N301U
N301V
N301W
N301X
C
CI
>
T
R
+
–
×
÷
KC
KCI
KCM
KB
KT
KR
KE
KS
KX
K÷
CM
N311K
KB
KT
KR
KE
KC
KCI
KCM
KS
KX
K÷
1.5K
5
25V
1.5K
5
25V
1.5K
5
25V
1.5K
5
25V
1.5K
5
25V
1.5K
5
25V
1.5K
5
25V
1.5K
5
25V
1.5K
5
25V
1.5K
5
25V
N312A
N311L
N311M
N311N
N311P
N311U
N311T
N311S
N311R
–10V(K)
N372M
100
N311V
KOR
N312C
nKT
N312B
nKR
nKX
KT
KR
KX
KN
KP
5.6K
5
25V
KP
N301Y
N302A
N362Z
K(N+P)
N311Z
N342U
N322S
N332X
N322T
FK
D
Q
C
nQ
OS
nS
Q
SC
nR
nQ
P-8
N302J
N352W
FK
RC
N391X
N343S
N341L
N362Y
N343T
N331N
N362X
N342A
N362R
N372P
N382S
N401T
N362W
N322N
N352F
N381S
N342X
N342W
N371U
N322P
N343R
N352M
N381K
N391W
N362V
K(C+B)
N322R
N343B
N362S
N401E
N372W
N342D
N332W
N371V
N402H
KA
N322U
N341Y
nK(X+T) {BC}
CP
K(N+P)
FO
N302M
N342B
OS
N351Z
N361P
N382X
N391Z
N401R
NTW
N331L
N311Y
N302B
N342Y
N321P
nK(CI+CM)
N371T
N331S
K(N+P+X+÷) {SFABP}
K(E+S+X) {RFABDP}
K(X+÷) {FB}
K(N+P+T) {RFABDP,FD,BC}
K(P+÷) {SFAP}
N382W
OS+FL
N331T
N361Y
OS
FL
N392D
N401K
30A4
30A9
33O1-6
30O2-2
30O3-2
30O4-2
30O5-2
30O7-1
OS.ST
Q
MC
N302T
MC2
FL
CC0
KT
F÷
K÷
EP
N331K
N364V
N391D
N402Y
33A1
33A2
33O2-6
K(E+S)
30B6-16
30A5
30A7
30A8
30A6
K(E+S)
KX
K÷
K(N+P)
KT
KX
K÷
KP
31O6-2
31O7-2
31O8-2
31O9-2
KN
KP
nKX
nKT
K(N+P)
KX
K÷
30O8-1
31O5-2
KE
KS
KC
KB
KCI
KCM
32O1-2
31O3-2
34O1-7
32A1
31V1-0
31V2-0
31V3-0
34V12-7
33V1-1
33B2-12
33B1-15
30B7

2
1
2
4
FC2
to FM Flag
nFM
nFX
FG
nIR15D=0
CC1
CINT5
40A1
Canon 161 Calculator
Section: Control State Machine
Page: 8 Rendition: 2022 Feb 6
N382Y
CC0
N331P
N342C
N352H
N362B
N371W
N392B
N382R
CC1
N302E
N312R
N321M
N332Y
N341Z
N352L
N382J
CC2
N321X
N332P
N362D
N392H
NTN
N382B
CC3
N312U
N342F
N362E
N372E
N392M
N402J
N381Y
CC4
N322X
N331W
N351Y
N371Z
N402K
NTR
N382E
CC5
N332T
N352R
N362F
NTS
N382D
CC6
N372K
N392E
N402S
NTT
N382T
CC7
N362J
N372V
N392R
NTU
N401V
N362C
N372T
N401N
NTM
N382C
CC2+5
N321S
N341W
N343E
N362P
N372S
N392T
n2
n4
n1
n2
n4
1
2
n4
n1
2
n4
1
n2
4
n1
n2
4
1
2
4
n1
4
CC2
CC5
NTP
N321Z
N321U
N343Y
FC1
J
Q
C
nQ
CP
TC
nTE
nFL
K
n(FX+F÷)
CC4
nFM
nF÷
nFM
AC=0
CC2
KT
nF÷
OS
CC0
F÷
KT
FL
T-4
CC0
F÷
CC2
DC=0
F÷
nFG
TD15
CC4
CINT3
CINT4
nFM
CC5
AC=0
KC
1
n1
FC2
J
Q
C
nQ
CP
TC
nTE
K
2
n2
FC4
J
Q
C
nQ
CP
TC
nTE
K
4
n4
FZ
FX
FZ
CC0
F÷
KT
KC
FG
CC1
nF÷
KR
CC1
KC
FX
nFM
DC=0
CC3
KC
IFC1
KC
F÷
KT
FL
T-4
CC7
FX
TD16
T-8
CC4
IFC2
to FM Flag
FC4
KCI
KCM
N312S
FS
F÷
nKR
CC1
CC3
N381M
N392L
K(E+S)
nF÷
OS+FL
CC1
N381N
N402Z
38A11
38A12
38A13
38A14
31A1
31A2
38A16
38A17
38A18
38A19
38A20
38A21
40A18
38A22
38A23
38A24
38A25
38O3
38O4
38O5
38O6
38O8
38O10
38O9
38A15
SFC2
RFC2
SFC1
RFC1
SFC4
RFC4
38B9
38B10
38B11
38B12
38B13
38B14
38B15
38B16
38A26
38A27
38A28
38A29
38A30
38A31
38A32
38A33
38O7
38O11-4
38B17
38B6-10
38B7-10
38B8-10
40B1-14

Canon 161 Calculator
Section: Flags F–, FS, FX, F÷, FO
Page: 9 Rendition: 2022 Feb 6
FO
J
Q
C
nQ
K
CP
N352A
FO
N362M
N372R
N381T
N352B
nFO
N362H
N382M
KN
FK
nIR16D=0
CC1
nFM
CC5
AC=0
TD16
CC1
OS
KC
B329
N353A
–V(L)
OVER
FLOW
–2V
5.6K
FX
J
Q
C
nQ
K
KX
CP
N341N
FX
nFX
KR
CC1
OS
nKR
CC0
OS
N322Y
N331V
N351X
N372H
N392F
N401U
N362K
N372J
N382A
N402D
N341M
nFS
nFM
nFCU
CA
CC7
N352T
N392V
nFX
CC2
F÷
CC2
CC6
FS
J
Q
C
nQ
K
CP
N392W
FS
nFS
N312W
N343U
N371L
N343V
N371K
N401Z
NTK
N392X
EP
CC7
F÷
FM
nFZ
CC4
nFM
CC3
CA
F–
J
Q
C
nQ
K
EP
CP
OS
KS
N364U
F÷
J
Q
C
nQ
K
EP
CP
N401Y
F÷
nF÷
N312V
N321W
N331M
N361Z
N372N
N371Y
N382K
N392J
N401L
nFX
n(FX+F÷)
nF÷
N342E
N381Z
N402R
N302C
N321N
FH
nFM
nAM16D=0
T-4
nF÷
CC2
nFH
F÷
nACC15D=0
T-4
nFM
CC5
FH
F÷
nME1516D=0
T-4
nFM
CC5
nFM
FG
nIR16D=0
CC1
nFH
nFM
nIR16D=0
T-4
CC2
N382L
N362A
36A18
36A19
36A20
36A21
36A22
39A8
35A1
35A2
35A3
35A4
39A1
39A2
39A3
39A4
39A5
39A6
39A7
34A1
34A2
40A2
39O1
39O2
34O2
36O8
35O1
SFO
CINT5
KCM
KB
KR
N312P
K(CM+B+R+E+S)
N352K
31O3-2
K(E+S)
40B2
40B3-14

EP
FH
J
Q
C
nQ
K
SFH
RFH
CP
N351K
FH
N362L
NTJ
N351L
nFH
N343D
N361N
KB
OS
AC=0
FCO
J
Q
C
nQ
K
CP
FCO
nFS
nFM
CA
CC4
KCI
CC0
K÷
KX
KC
FS
nFM
CA
CC4
FCU
J
Q
C
nQ
K
CP
nFS
nFM
CA
CC7
KC
FS
nFM
CA
CC7
N391U
N343H
N392S
N343N
FCU
nFCU
FG
J
Q
C
nQ
K
CP
N401M
N371X
N382P
N402X
nFG
N331U
N381X
FG
CINT5
TD16
CC4
T-8
CC0
TD16
CC1
CC6
n(FX+F÷)
N402V
N364M
FX
DC=1
TD15
CC4
F÷
DC=15
FZ
CC4
SFG
NTH
Canon 161 Calculator
Section: Flags FG, FH, FZ, FCO, FCU
Page: 10 Rendition: 2022 Feb 6
N362N
K(E+S)
F÷
OS
CC1
FH
FO
T-4
CC5
K÷
CC1
OS+FL
FX
KT
OS
AC=0
F÷
nDC=0
T-8
FM
CC2
nFM
PC=0
nAC=0
CC3
EP
N351E
N364J
CINT6
N364B
N351D
nFM
CC1
AC=0
OS
K÷
40A3
40A4
40A5
40A6
40A7
40A8
36A23
36A24
36A25
36A26
36A27
36A28
35A5
36A29
36A30
34A3
34A4
34A5
39A9
39A10
34O3
36O11
36O10
40O1
39O3
FZ
J
Q
C
nQ
K
CP
N402W
N322W
N364Y
N402T
nFZ
N321V
N392K
FZ
FX
CC4
DC=0
KA
F÷
nFA
CC3
FX
TD15
N382Z
N372F
CC4
TD16
FX
KR
CC0
F÷
nFM
F÷
nFA
nME1516D=0
CC3
nFS
F÷
IR2-2
DC=0
CC3
nMSD=0
FX
DC=0
T-8
CC3
N402U
N364Z
CINT6
nFX
KR
BC=0
OS
CC0
NTF
SFZ
40A9
40A10
40A11
40A12
40A13
40A14
40A15
40A16
40A17
40O2
40O3
(duplicate OR diode)
36O9

CP
SP-A
ME
nQ
MC
SP-A
N331Z
N371C
N391E
N401D
FM
nFG
FX
CC4
nFP
CC5
FP
CC2
nKX
nKR
CC1
CP
SP-M
ME
nQ
MC
SP-M
N321E
N301K
N311E
N331E
nK(CI+CM)
nFO
FP
CC2+5
CC1
CC4
FA
FM
33A3
33A4
33A5
33A6
32A7
32A8
32A9
33A7
32A10
CP
SP-I
ME
nQ
MC
SP-I
N322F
N301L
N312F
N332F
N342M
FM
F÷
nFZ
F÷
CC2
CC4
nFP
CC2
32A3
32A4
32A5
32A6
KCM
KR
KX
N312N
nK(X+R+CM)
N382N
FM
J
Q
C
nQ
K
CP
N381D
N321L
N331X
N341S
N382H
nFM
N343X
N352P
TD16
FM
enable clocking of
registers & counters
FO
CC2+5
AC=0
nFO
TD15
CC1
TD1
KB
TD15
CC2+5
TD0
T-8
FG
CC1
FC4
SFM
N361L
N371S
N391L
N352J
N362T
N392P
N401W
NTA
CINT3
CINT4
FC2
K(X+R+CM+B+C)
KN
N381L
N391V
38A4
38A5
38A6
38A7
38A8
38A9
38A10
38O2
38O1-6
KCI
KT
K÷
N311W
K(P+÷+E+S+T+CI)
N302F
KP
N392A
K(E+S)
KC
KCM
KB
KR
KX
N311X
N391Y
31O2-1
31O4-2
CC0
OS
OS
OS+FL
39A11
39A12
39A13
31O1-6
38B5-01
38B4-10
31V4-0
Canon 161 Calculator
Section: FM Flag & Shift-Pulse Generators
Page: 11 Rendition: 2022 Feb 6
33V2-1
32V1-1
32V2-1
33O3-6
32O3-6
32O2-6
CC5
32A2
33B3-D
32B1-D
32B2-D

FD
enable DC
FB
enable BC
FP
J
Q
C
nQ
K
SFP
RFP
CP
N351A
N321R
N332N
N362U
N351B
nFP
N321Y
N332S
N343F
NTB
N392U
FP
enable PC
N341X
FH
CC2+5
FO
nFM
nFH
nFO
CC2
nFM
CC2
F÷
SFAP
SFABP
N364T
N352D
RFAP
RFABDP
N352C
N364R
nFH
FO
nFM
CC2+5
AC=0
CC7
nFO
CC5
FH
36A31
36A32
36A33
36A35
36A36
36O13
36O12
FA
J
Q
C
nQ
K
CP
N391M
FA
enable AC
nFA
N321T
NTC
N402F
N391N
nAC=0
CC7
TD0
OS
KR
OS+FL
K(P+÷)
KT
F÷
nPC=0
CC0
SFAP
K(N+P+X+÷)
nFM
nPC=0
CC0
FO
nFM
FG
nBC=0
CC1
SFABP
RFABDP
K(E+S+X)
CC1
OS+FL
K(N+P+T)
CC0
PC=0
KR
CC0
BC=0
EP
SFBD
F÷
CC1
KP
FO
FG
BC=0
CC1
RFAP
KR
CC1
AC=0
CINT6
F÷
CC1
FG
FX
CC2
FP
CC2
SFAP
SFABP
nFM
CC3
AC=0
F÷
CC1
KP
RFAP
RFABDP
36A15
36A16
36A17
36O6
36O7
FB
J
Q
C
nQ
K
CP
RFB
SFB
• CC2+5 input to gate 34A6 labeled on board as CC5.
• OR Diode for connection between 36A34 & 36O20 is labeled and installed as AND (DA/red) rather than DO/green).
FM
CC5
FP
KR
nBC=0
OS
CC0
AC=0
CC7
FX
KP
N364L
N341P
N364A
N341R
F÷
CC2
36O16
FD
J
Q
C
nQ
K
CP
CC7
AC=0
nAC=0
CC7
TD0
K(N+P+T)
F÷
OS
CC0
FX
CC3
FX
CC1
SFBD
36A49
36A50
36A51
36A52
36A53
36O19
SFA
N364N
N391P
RFA
N391R
N364D
Canon 161 Calculator
Section: Counter Enable Flags FA, FB, FD, FP
Page: 12 Rendition: 2022 Feb 6
36O20
RFABDP
RFD
N351M
N364K
SFD
N364E
N351N
RFDP
RFDP
RFDP
36B1-13
36A34-2
36A1
36A2
36A3
36A4
36A5
36A6
36A7
36A8
36A9
36A12
36A13
36A14
36A10-0
36A11
36B2-13
36B5-13
36B4-13
36B3-13
SFBD
SFABP
RFABDP
36A39
36A40
36A41
36A42
36A44
36O15
CC2+5
nFP
K(X+÷)
CC0
PC=0
34A6
36A43
36O1
36O2-6
36O3-6
36O5-6
36O4-6

34A9
Canon 161 Calculator
Section: A & B Counters (AC & BC)
Page: 13 Rendition: 2022 Feb 6
BC1
J
Q
C
nQ
R
RC
K
CP
BC2
Q
nQ
R
RC
P-8
N341V
BC=0
N361K
N341U
nBC=0
N361R
FM
nTEa
TC a
nTE b
TC b
CP
nKR
CC0
OS
FX
nFP
OS
nK(X+T)
n(FX+F÷)
CC3
rB/BCRES
CC1
K(E+S)
CP
BC4
Q
nQ
R
RC
nTE a
TC a
nTE b
TCb
CP
BC8
Q
nQ
R
RC
nTE a
TC a
nTE b
TC b
N401S
NTE
AC1
J
Q
C
nQ
R
RC
K
CP
AC2
Q
nQ
R
RC
P-8
N392Y
AC=0
N351C
N392Z
nAC=0
N361X
FM
nTE a
TC a
nTE b
TC b
CP
CP
AC4
Q
nQ
R
RC
nTE a
TC a
nTE b
TC b
CP
AC8
Q
nQ
R
RC
nTE a
TC a
nTE b
TC b
N352N
N361U
EP
EP
EP
EP
FA
CC2+5
nFP
REV
NOR
N382F
NTD
K(N+P+T)
CC0
F÷
KR
CC1
OS
N341K
N364F
FG
CC1
FZ
F÷
CC1
BRN/BCRVS
N341D
N364H
39A14
39A15
36A37
36A38
36A45
36A46
34A7
34A8
34A10
39A16
36O14
36O17
REV
NOR
FB
0=UP, 1=DOWN
0=DOWN, 1=UP
34V2-8
34V3-8
34A9
34B1-17
34V1-6
39V1-2
39V2-3
39V3-1
39V4-1
34A11
34V4-7
34V5-7

Canon 161 Calculator
Section: Point Counter (PC)
Page: 14 Rendition: 2022 Feb 6
B329
N353W
B329
N353T
B329
N353P
B329
N353L
B329
N353H
DP3
DP6
DP9
DP12
DP15
PC1
J
Q
C
nQ
R
RC
K
1
CP
n1
PC2
Q
T
nQ
R
RC
P-8
FM
PC4
Q
T
nQ
R
RC
PC8
Q
T
nQ
R
RC
rP
N352Y
PC=0
N361W
B329
N353X
B329
N353U
B329
N353R
B329
N353M
B329
N353J
DP2
DP5
DP8
DP11
DP14
THOU2
B329
N353Y
–V(L)
B329
N353V
B329
N353S
B329
N353N
B329
N353K
–2V
DP1
DP4
DP7
DP10
DP13
1
n2
n4
n8
n1
n2
4
n8
1
2
4
n8
n1
2
n4
8
1
n2
4
8
THOU1
B329
N353Z
DP0
N352X
nPC=0
N361V
KB
CC0
FM
KC
FP
F÷
KR
OS
N351V
N364S
F÷
CC1
FG
CP
CP
CP
2
n2
4
n4
8
n8
35A6
35A7
35A25-2
35A26-2
36O18
35O2
–V(L)
–V(L)
–2V
–2V
35A9-2
35A10-2
35A11-2
35A12-2
35A13-2
n1
2
n4
n8
1
n2
4
n8
n1
n2
n4
8
1
2
n4
8
n1
2
4
8
35A14-2
35A15-2
35A16-2
35A17-2
35A18-2
1
2
n4
n8
n1
2
4
n8
1
n2
n4
8
n1
n2
4
8
1
2
4
8
35A20-2
35A21-2
35A22-2
35A23-2
35A24-2
n4
n2
n1
n8
n1
n2
n4
n8
35A8
35A19-2
35V1-1
35V2-1
36A47
36A48
35B1-10
THOU3
35A27-2

Canon 161 Calculator
Section: Digit Counter (DC)
Page: 15 Rendition: 2022 Feb 6
n4
n2
n1
n8
B329
N354W
R
B329
N354T
R
B329
N354P
R
B329
N354F
R
B329
N354C
R
1
2
n4
n8
n1
2
4
n8
1
n2
n4
8
n1
n2
4
8
1
2
4
8
820
35V9
B329
51K
12K
B329
N354X
R
B329
N354U
R
B329
N354R
R
B329
N354H
R
B329
N354D
R
n1
2
n4
n8
1
n2
4
n8
n1
n2
n4
8
1
2
n4
8
n1
2
4
8
820
35V8
B329
51K
12K
B329
N354Y
MK1
R
R
B329
N354V
R
R
B329
N354S
R
R
B329
N354N
R
R
B329
N354E
R
R
1
n2
n4
n8
n1
n2
4
n8
1
2
4
n8
n1
2
n4
8
1
n2
4
8
820
35V7
B329
51K
12K
MK4
MK7
MK10
MK13
MK2
MK5
MK8
MK11
MK14
MK3
MK6
MK9
MK12
MK15
DC1
J
C
R
RC
K
CP
P-8
FM
CC4
FX
rD/RDF
N351R
DC=0
N342H
N381U
N361S
n4
n2
1
n8
N351S
DC=1
N402P
4
2
1
8
N351T
DC=15
N402N
33
10
–2V
B329
N354Z
MK0
n1
n2
n4
n8
CC1
THOU3
THOU2
nDC=0
N351P
N402E
KR
CC1
OS
EP
N364P
N352E
Q
nQ
1
n1
DC2
Q
T
nQ
R
RC
DC4
Q
T
nQ
R
RC
DC8
Q
T
nQ
R
RC
CP
CP
CP
2
n2
4
n4
8
n8
35A28
35A29
35A35-1
35A36-1
35A37-1
35A38-1
35A39-1
35A40
-1
35A41-1
35A42-1
35A43-1
35A44-1
35A45-1
35A46-1
35A47-1
35A48-1
35A49-1
35A33-2
36O21
35O3
35O8-0
35O7-0
35O4-0
35O5-0
35O6-0
35O18-0
35O17-0
35O14-0
35O15-0
35O16-0
FX
–V(L)
–2V
–V(L)
–V(L)
–2V
–2V
FD
36A54
35B8-10
R
R
R
R
R
35O13-0
35O12-0
35O9-0
35O10-0
35O11-0
R
R
R
R
R
R
35A34-1
35B4-10
35V5-4
35V6-5
35B5-10
35B6-10
35B7-10
R
THOU1
35O19
R
35O20
R
35O21
35B2-10
35B3-10
35A31
35A32
35A30
35V3-1
35V4-1

Canon 161 Calculator
Section: Arithmetic & ACC Register
Page: 16 Rendition: 2022 Feb 6
S1
D
Q
C
nQ
SP-A
Y
nY
nCA
X
Y
nCA
nX
nY
CA
nX
Y
CA
X
nSM
Y
nFS
X
CA
nFS
X
T-8
S1
SM
T-8
S2
SM
Y
FS
nX
CA
FS
nX
nFS
nFS
T-8
C10•T-8
n(C10•T-8)
S2
nFS
C10•T-8
nS2
C10•T-8
S2
nS2
FS
nFS
FS
n(C10•T-8)
S2
S1
FS
n(C10•T-8)
C10•T-8
S2
nFS
n(C10•T-8)
C10•T-8
S2
D
Q
C
nQ
SP-A
S3
D
Q
C
nQ
SP-A
nS3
S4
J
Q
C
nQ
SP-A
CA
D
Q
C
nQ
SP-A
CA
nCA
F÷
TD1
T-8
CC3
nR
RC
FM
CP
FX
CA
CC3
CA-RES
CA-IN
• Silkscreen labels by edge connections of Board 37 for FS and
nFS are inverted. Labels in foil are correct.
X
nX
ME
CC6
9ACC
Y
nY
KA
FX
F÷
TD0
T-1
F÷
CC4
FG
CC6
CC3
IR
KA
F÷
CC6
F÷
TD1
T-8
CC3
nFX
CC3
FZ
CC3
K(N+P)
CC0
CC7
nFX
nF÷
KA
CC6
CC1
CC6
CC7
nK(CI+CM)
CC0
FO
CC2+5
CA
N371D
N392N
N343W
K
nFP
nFH
FCO
T-9
CC2+5
N371M
N343K
nS1
S1
SP-A
D
Q
C
nQ
J
Q
C
K
nQ
N401A
N372L
N391A
N401B
D
Q
C
nQ
J
Q
C
K
nQ
N371A
N391B
J
Q
C
K
nQ
J
Q
C
nQ
SP-A
SP-A
SP-A
SP-A
SP-A
ACC
ACC5-8
ACC1-1
ACC11-8
ACC6-1
ACC12-1
ACC15-8
K
18 more
flip-flops
22 more
flip-flops
14 more
flip-flops
S2
nACC15-1
37A2
37A3
37A4
37A5
37A6
37A7
37A8
37A9
37A10
37A11
37A12
37A13
34A30
37A15
37A16
37A17
37A18
37A19
37A20
37A21
37A22
37A23
37A24
37A25
37A26
37A27
37A28
37A29
37A30
37A34
37A32
37A43
37A44
37A38
37A39
37A40
37A41
37A42
37A35
37A36
37A37
37O1-6
37O4-6
37O3-6
37O8
37O9
37O10
37O7
SM
nS4
S1
S2
nS2
nACC15-2
nACC15-4
nACC15-8
FS
T-8
nFS
T-8
FS
nFS
37A1
37O2-6
37B1-10
37V1-0
37V2-1
37V3-1
37V4-1
37V5-1
37O6-6
37V9-1
37V10-1
37O5-6
37B2-13
37V7-1
37V8-1
37A33
37V6-1
37A31
SM

2 more
flip-flops
Canon 161 Calculator
Section: Indicating Register (IR)
Page: 17 Rendition: 2022 Feb 6
N301A
N301B
IR1-8
D
Q
C
nQ
IR1-1
J
Q
C
K
nQ
S
SC
IR1-2
J
Q
C
K
nQ
S
SC
IR1-4
J
Q
C
K
nQ
S
SC
W1
S
SC
CP
W2
CP
W4
CP
W8
CP
n8
IR2-8
D
Q
C
nQ
IR2-1
J
Q
C
K
nQ
IR2-2
J
Q
C
K
nQ
IR2-4
J
Q
C
K
nQ
SP-I
IR6-8
Jnr
Q
C
K
nQ
IR3-1
J
Q
C
K
nQ
N311A
14 more
flip-flops
N321A
N312L
N321B
N312M
IR10-8
Jnr
Q
C
K
nQ
IR7-1
J
Q
C
K
nQ
N331A
N322L
N331B
N322M
IR14-8
Jnr
Q
C
K
nQ
IR11-1
J
Q
C
K
nQ
N341A
N332L
N341B
N332M
IR15-8
Q
C
nQ
IR15-1
J
Q
C
K
nQ
N322V
N302L
N302K
N342V
G-Z
FZ
FX
CC4
SP-I
SP-I
SP-I
SP-I
SP-I
SP-I
SP-I
SP-I
N302X
SP-I
SP-I
SP-I
SP-I
SP-I
SP-I
SP-I
IR
N342P
N372Y
nIR
N342T
N302Y
N402C
J
K
IR16-2
D
Q
C
nQ
SP-I
IR16-8
D
Q
C
nQ
SP-I
IR16-1
D
Q
C
nQ
SP-I
D
Q
C
nQ
SP-I
IR16-4
IR16-2
nIR16-2
IR16-4
IR16-2
DC=0
FX
nMSD=0
T-8
CC3
G-J
IR16-2
nIR16-2
N342N
MSD-1
FO
CC1
ME
nF÷
KR
ACC
F÷
FG
ACC
CC4
ME
CC7
G-I
N371R
N342S
FG
F÷
FO
K(N+P)
CC7
KCI
KR
CC0
CC2+5
CC4
CC6
G-II
N371P
N342R
K(C+B)
33K
33K
33K
14 more
flip-flops
14 more
flip-flops
34A12
37A45
37A46
37A47
37A48
37A49
32A11
-4
34A13
34A14
30A10
37A50
37A51
37A52
37A53
34A15
34A16
34A17
34A18
34A19
34A20
34A21
34A22
34A23
30A11
37O11-6
34O4
34O5
34O6
34O7
Display
Digit 1 (LSD)
8
n4
4
n2
2
n1
1
n8
Display
Digit 2
8
n4
4
n2
2
n1
1
n8
Display
Digit 16 (MSD)
8
n4
4
n2
2
n1
1
IR2-2
Display
Digit 3
n8
8
n1
1
Display
Digit 6
Display
Digit 7
n8
8
n1
1
Display
Digit 10
Display
Digit 11
n8
8
n1
1
Display
Digit 14
Display
Digit 15
n8
8
n1
1
nIR16-1
nIR16-2
nIR16-4
nIR16-8
nIR15-1
nIR15-2
nIR15-4
nIR15-8
n4
4
n2
2
30V1-1
30V2-1
34V8-9
34V6-6
34V7-7
0=SHIFT, 1=INC
IR16-2
nIR16-2
IR16-4

SP-M
ME4-8
Jnr
Q
C
K
nQ
ME1-1
J
Q
C
K
nQ
N301C
N372U
N311D
N301E
N311C
N301D
ME8-8
Jnr
Q
C
K
nQ
ME5-1
J
Q
C
K
nQ
N321D
N312D
N321C
N312E
ME12-8
Jnr
Q
C
K
nQ
ME9-1
J
Q
C
K
nQ
N331D
N322D
N331C
N322E
ME16-8
D
Q
C
nQ
ME13-1
J
Q
C
K
nQ
SP-M
SP-M
SP-M
SP-M
SP-M
SP-M
SP-M
ME
nME16-4
nME16-2
nME15-4
nME15-8
nME15-2
nME16-1
nME15-1
N332B
nME1516D=0
N361C
N401X
N332C
nME16D=0
N343M
nS2
nS3
nACC15-4
nACC15-8
nACC15-2
nS4
nACC15-1
N372Z
nACC15D=0
N361B
N371B
nACC16D=0
N343P
nS1
nIR16-4
nIR16-2
nIR15-4
nIR15-8
nIR15-2
nIR16-1
nIR15-1
N341C
nIR15D=0
N401P
N342L
nIR16D=0
N352U
nIR16-8
N342K
nMSD=0
N402A
nIR16-2
nIR16-4
nIR16-8
N343L
nAM16D=0
N361D
nIR
N361E
CC6
ACC
nKT
CC7
ACC
nKT
FO
CC6
CC2+5
CC7
K(C+B+CM)
G-M
N372X
N332E
9ME
nFP
nFH
FCU
T-9
CC2+5
N343J
Canon 161 Calculator
Section: ME Register & Zero Gates
Page: 18 Rendition: 2022 Feb 6
14 more
flip-flops
33K
33K
14 more
flip-flops
14 more
flip-flops
33K
14 more
flip-flops
nME16-8
37A57
37A58
37A59
34A24
34A25
34A26
34A27
37A60
37A60
33A8
33A9
34A28
34A29
37O12-6
37O13
34O8-6
N343A
N371N
KCM
K(C+B)
nME15-1
nME15-8
nME16-1
nME16-8
34B2-11
37V11-0
34V9-7
34V10-7
34V11-7
37V12-1
37V13-1
33V3-1
33V4-1
37A54
37A55
37A56

12.6V
POWER
3000
25V
2A
–VR
1K
820
TR2
2SB221
2•
2SB250
RD6A
5.9V
gn
115VAC
85W
gy
wh
12V
gn
light bu
5000
25V
bu
bu
vi
3A
TR1
2SB243
100
25V
2000
25V
10
100
15V
10
–10V(K)
0.2
0.2
dark bu
bn
30
15V
115V
100V
NS1
NS5
NS2
NS6
NS7
NS8
–2V
NS3
1.8
NS4
820
3A
2000
25V
og
2SB243
3
2000
25V
+VR
1K
1K
TR4
2SD77
3.9K
1.5K
TR3
2SD77
1.5K
30
15V
820
bk
gn
small
dark bu
N401H
N391H
N381H
N371H
N361H
N351H
N341H
N331H
N321H
N311H
N301H
N312J
N322J
N332J
N401F
N391F
N381F
N371F
N361F
N351F
N341F
N331F
N321F
N311F
N301F
N312H
N322H
N332H
N401J
N391J
N381J
N371J
N361J
N351J
N341J
N331J
N321J
N311J
N301J
N312K
N322K
N332K
NS9
NS10
N352Z
N342Z
N332Z
N322Z
N312Z
N302Z
–2V
–2V
–2V
–2V
–2V
Canon 161 Calculator
Section: Power Supply
Page: 19 Rendition: 2022 Feb 6
E
–10V
+10V
–2V
N302V
100
15V
FAN
DC
1.6A
12V
12.6V
DC
2.5A
to display lamps
390
30
15V
30
15V
30
15V
2 of
30
15V
100
15V
30
15V
100
15V
30
15V
100
15V
to keyboard
–V(L)
Board Cumu. mA Board mA
30 231 231
31 453 222
32 649 196
33 871 222
34 1046 175
35 1280 234
36 1307 27
38 1438 131
39 1565 127
40 1660 95
37 1785 125
Board Current Draw
During measurement, V–10 at
backplane was ~ 9::9.6V due
to ammeter drop.
Display connectors not in place.
–19V
2•
DV14C
2•
SR1A-2
2•
DV14C
1S311

FL
0µS
400
6000
Canon 161 Calculator
Section: Timing Diagram
Page: 20 Rendition: 2022 Feb 6
CP
T-1
T-4
T-8
P-8
SP- x
TD0
TD1
TD15
TD16
800
1200
1600
2000
2400
2800
3200
3600
4000
4400
4800
5200
5600
6000
0µS
logic 1
(–10V)
logic 0
(0V, GND, E)
400
FM
Notes
•Signals are shown as they would typically appear on an oscilloscope, with more-positive voltage
vertically higher on the trace. In contrast, for logic levels logic 1 is the lower level of a trace and logic 0
the higher level.
•One cycle of FM during an operation is shown here. SP- x , TD x , and FL are only active during FM.
During some states, these signals may vary from those shown here .
•As measured, CP cycle time is 105 µS (9.6 KHz) with 0 pulse of 17 µS.
•As measured, SP-x 0 pulses are 20 µS.
6400
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16