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Canon 161 Calculator
Section: Title & Contents
Page: 1
Rendition: 2022 Feb 6
Canon 161
Calculator
Contents
Section
Title & Contents (this page)
Notes & Signal Names
Block Diagram
Modules - Gates & Display
Modules - Flip-Flops
Timing
Keyboard
Control State Machine
Flags F–, FS, FX, F÷, FO
Flags FG, FH, FZ, FCO, FCU
FM Flag & Shift Pulse Generators
Counter Enable Flags FA, FB, FD, FP
A & B Counters (AC & BC)
Point Counter (PC)
Digit Counter (DC)
Arithmetic & ACC Register
IR Register
ME Register & Zero Gates
Power Supply
Timing Diagram
Connectors Nbb1p & Nbb2p
Connectors Nbb3p & Nbb4p
Board Layout - 30::33
Board Layout - 34::37
Board Layout - 38::40
Controller/Monitor Unit (CMU)
CMU.1
CMU Operation
CMU.2
Page
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
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.
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Related Manuals for Canon 161
Summary of Contents for Canon 161
- Page 1 Controller/Monitor Unit (CMU) CMU.1 CMU Operation CMU.2 This schematic has been derived through the reverse engineering of a Canon 161 calculator. Canon 161 Calculator This is not the manufacter’s schematic, nor based on the Section: Title & Contents manufacturer’s schematic.
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Page 2: Signal Names
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. Canon 161 Calculator Section: Notes Page: 2 Rendition: 2022 Feb 6... - Page 3 IR Register (Indicating Register, 64 bits) P Counter D Counter (Point, 4 bits) (Digit, 4bits) W1,W2,W4,W8 1-of-16 1-of-16 Decoder/Drivers Decoder/Drivers 16 Incandescent Displays Overflow 16 1-of-10 Decoder/Drivers 6543210987654321. Lamp Canon 161 Calculator Section: Block Diagram Page: 3 Rendition: 2022 Feb 6...
- Page 4 = type variation (see tables above) p = pin (A to Z) –2V • Logic 0 = 0V, GND, E Logic 1 = –10V Canon 161 Calculator Section: Modules - Gates & Display Page: 4 Rendition: 2022 Feb 6...
- Page 5 Note: Logic 0 = 0V, GND, E Logic 1 = –10V BC Counter BC Counter JK, R CJK=820pF CJK=470pF CFF=1nF T=A538 T, R CT=820pF Canon 161 Calculator JK, R CJK=470pF CR=470pF T=B221 T, R CT=820pF TETC, R CR=470pF T=B221 T, R CT=820pF...
- Page 6 N302R N361T 30A2 30B2 N382V N302S N342J 30A3 30B3 N364X 38A3 38B3 TD16 N381V N352S N372A N402M N381W N402B N382U N331R N302H N341T 30B4 N351U N381A N391K 34O9 34B3-11 Canon 161 Calculator Section: Timing Page: 6 Rendition: 2022 Feb 6...
- Page 7 N401R 31O9-2 K(P+÷) {SFAP} K÷ N322U N341Y 32A1 nK(X+T) {BC} N331T N361Y 33O1-6 33B1-15 OS+FL N392D K÷ N401K K÷ 33O2-6 33V1-1 N331K N364V Canon 161 Calculator 33A1 33A2 33B2-12 F÷ N391D Section: Keyboard N402Y Page: 7 Rendition: 2022 Feb 6...
- Page 8 38B16 N382T N362J 38A24 N372V N392R RFC2 to FM Flag 38O8 38A25 38O11-4 38B17 CC2+5 N382C N321S F÷ N341W N343E SFC4 38O9 N362P Canon 161 Calculator N372S N392T Section: Control State Machine RFC4 38O10 Page: 8 Rendition: 2022 Feb 6...
- Page 9 K(E+S) N352B N321N N372N 35A3 N312P N352K 31O3-2 N362H N382L K(CM+B+R+E+S) 35O1 TD16 N382M 35A2 40A2 40B3-14 n(FX+F÷) AC=0 nF÷ N402R N342E 35A4 N381Z Canon 161 Calculator Section: Flags F–, FS, FX, F÷, FO Page: 9 Rendition: 2022 Feb 6...
- Page 10 40O2 40A4 N402X N331U TD15 40O1 CINT5 N351E N381X 40A10 nDC=0 N364J TD16 40A5 N402T N321V AC=0 36A29 N392K 36O11 F÷ nAC=0 PC=0 36A30 Canon 161 Calculator Section: Flags FG, FH, FZ, FCO, FCU Page: 10 Rendition: 2022 Feb 6...
- Page 11 32A5 F÷ N322F N301L 32B1-D SP-I N312F 32A2 N332F nK(CI+CM) N342M 32A9 32A10 32A8 32O3-6 32V2-1 SP-M CC2+5 32A7 N321E N301K 32B2-D SP-M N311E N331E Canon 161 Calculator Section: FM Flag & Shift-Pulse Generators Page: 11 Rendition: 2022 Feb 6...
- Page 12 36A35 N392U CC2+5 Canon 161 Calculator • CC2+5 input to gate 34A6 labeled on board as CC5. Section: Counter Enable Flags FA, FB, FD, FP • OR Diode for connection between 36A34 & 36O20 is labeled and installed as AND (DA/red) rather than DO/green).
- Page 13 34A8 34B1-17 34A11 34V4-7 34V5-7 BC=0 N401S N341U N361R nBC=0 34A9 34A9 nK(X+T) K(E+S) 34V1-6 N341K rB/BCRES N364F 36A45 36O17 F÷ K(N+P+T) 36A46 Canon 161 Calculator Section: A & B Counters (AC & BC) Page: 13 Rendition: 2022 Feb 6...
- Page 14 B329 B329 B329 35A12-2 35A17-2 35A23-2 DP13 DP14 DP15 N353K N353J N353H B329 B329 B329 35A13-2 35A18-2 35A24-2 –2V –2V –2V 35A25-2 THOU1 35A26-2 THOU2 35A27-2 THOU3 Canon 161 Calculator Section: Point Counter (PC) Page: 14 Rendition: 2022 Feb 6...
- Page 15 35A49-1 35O8-0 35O13-0 35O18-0 –2V –2V –2V 35A33-2 35V5-4 35V6-5 35B4-10 35B5-10 35B6-10 35B7-10 35V7 35V8 35O19 –2V 35O20 35O21 35V9 B329 B329 THOU1 THOU2 THOU3 B329 Canon 161 Calculator Section: Digit Counter (DC) Page: 15 Rendition: 2022 Feb 6...
- Page 16 37A42 nS1 S1 22 more 18 more C10•T-8 flip-flops N391A N401B flip-flops N401A N372L Canon 161 Calculator ACC11-8 ACC6-1 ACC5-8 ACC1-1 SP-A SP-A SP-A SP-A Section: Arithmetic & ACC Register • Silkscreen labels by edge connections of Board 37 for FS and...
- Page 17 SP-I SP-I SP-I SP-I SP-I SP-I N301B N342T n4 4 n2 2 n1 1 n4 4 n2 2 n1 1 Canon 161 Calculator Display Display Digit 2 Digit 1 (LSD) Section: Indicating Register (IR) Page: 17 Rendition: 2022 Feb 6...
- Page 18 N332B N361C N321C N312E nME15-2 33A9 33V4-1 nME1516D=0 N401X nME15-4 nME15-8 14 more N311D N301E flip-flops N301C N372U ME4-8 ME1-1 SP-M SP-M N311C N301D Canon 161 Calculator Section: ME Register & Zero Gates Page: 18 Rendition: 2022 Feb 6...
- Page 19 3.9K 2000 2000 1046 +10V 2SB243 1280 N401F N391F N381F N371F N361F N351F N341F N331F N321F N311F N301F 1307 1438 N332H N322H N312H 1565 1660 1785 2 of Canon 161 Calculator Section: Power Supply Page: 19 Rendition: 2022 Feb 6...
- Page 20 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 . Canon 161 Calculator As measured, CP cycle time is 105 µS (9.6 KHz) with 0 pulse of 17 µS. •...
- Page 21 ACC12-1 A FP A IR15-1 A IR11-1 A IR7-1 A IR3-1 A IR A Canon 161 Calculator Section: Connectors N bb 1 p & N bb 2 p • Bold-faced expressions are signal sources. Page: 21 Rendition: 2022 Feb 6...
- Page 22 IND10-8 B IND6-8 B OVERFLOW OVERFLOW A K(C+B+CM) A IND14-9 A IND10-9 A IND6-9 A Canon 161 Calculator Section: Connectors N bb 3 p & N bb 4 p • Bold-faced expressions are signal sources. Page: 22 Rendition: 2022 Feb 6...
- Page 23 33B3 N321A N331A Canon 161 Calculator • Flip-flop transistors are labeled on the physical boards as 0 or 1. • Transistors marked in red are those found faulty and replaced in Unit 700369. 1 is the Q transistor, 0 is the nQ transistor.
- Page 24 SFABP ACC14-4 RFABDP nACC15D=0 37B1 37V11 ACC14-8 ACC15-1 ACC14-1 37V1 RFAP SFBD 37B2 N362A N372A ACC15-8 N361Z N371Z ACC13-1 C10•T-8 37V6 n(C10•T-8) ACC12-1 37V13 N361A N371A Canon 161 Calculator Section: Board Layout - 34::37 Page: 24 Rendition: 2022 Feb 6...
- Page 25 (nFM) (SFM) 38B3 (TD16) FD16 ACC11-8 ACC6-1 ACC10-8 N381A N391A N402Z ACC3-2 ACC3-4 ACC3-1 ACC4-1 40B2 N402A F÷ ACC2-1 N401Z ACC5-1 40B1 40B3 ACC1-1 ACC5-8 N401A Canon 161 Calculator Section: Board Layout - 38::40 Page: 25 Rendition: 2022 Feb 6...
- Page 26 CP-OUT => nCP-OUT STOP Probe 1 Driver Repeat 470K NORMAL Driver PROBE 2 One-Pulse Probe 2 Repeat-Mode Driver 100K Enabler Astable STOP 220n Canon 161 Calculator Section: Controller/Monitor Unit / Version 3 REPEAT Driver Page: CMU.1 Rendition: 2022 Feb 6...
- Page 27 7. Press the “N” key of the CMU. The 161 should function normally. When operating in other than normal mode, a key pressed on the 161 may need to be held down until the operation is complete. This is necessary for some operations because the calculator logic utilises the state of the keyboard during execution.