Scientific Development Corporation Minivac 601 Getting Acquainted Download

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Getting acquainted with

S C IE N T IF IC

D E V E LO P M E N T

. . . 3 T i r S t S t e p

c o r p o r a t io n

to w ard th e exciting world o f electro nic

w—

d ata processing via digital co m p uters

Summary of Contents for Minivac 601

Page 1: ...Getting acquainted with M i n i v a c 6 0 1 SCIEN TIFIC r j DEVELOPM ENT 3 T i r S t S t e p corporation toward the exciting world of electronic w data processing via digital computers ...

Page 2: ...ssing machine This is the first in a series of books using M IN IV A C 601 to demonstrate the fundamentals of modern digital computers This book acquaints you with M IN IVA C 601 The second book in this series relates the components of M IN IVA C 601 to corresponding parts of a large commercial digital computer Other books enable you to use M IN IVA C 601 to discover how these parts function to ma...

Page 3: ...ay Controls Itself 17 PAGES _ _ _ _ _ E S P i5 P i fSLIDE SW ITC H ES 18 Experiment 10 Slide Switch O peration 19 RO TARY SW ITCH 20 Experiment 11 Manual Operation of Rotary Swi t c h 21 Motor D rive 22 Resistors 22 Decimal Input Output 22 Experiment 12 Basic Motor Operation 23 Experiment 13 Motor Driven Rotary Sw itch 23 Pulse Generator 24 Programmer 24 Experiment 14 Motor Reversing 24 8 M A TRIX...

Page 4: ...was prepared and edited by the staff of Scientific Development Corporation First Printing August 1961 EX LIBRIS ccapitalia net Copyright c 1961 by Scientific Development Corporation 372 Main Street Watertown Massachusetts ...

Page 5: ...ter is not in use The red power light shows when the power is O N The red button above the power switch labeled CIRCUIT BREAKER is a safety switch which autom atically turns off the power supply when it is overloaded An overloaded circuit or a short circuit w ill cause the circuit breaker to blow just like a household fuse A short circuit occurs when is wired directly to without a component in bet...

Page 6: ...h CLO SED CIRCUIT PRINCIPLE For any electrical device to operate it is necessary for electrical current to flow THROUGH the d evice A closed electrical circuit must be established to let the electrons flow from the negative power supply terminal through the component to the positive power supply terminal Thus all electrical components on the M IN IV A C 601 require at least 2 connections to operat...

Page 7: ...th the second programming w ire These connections cause lamp 1 to light when the Power Switch is turned on This simple circuit is discussed further in Experiment 2 Disconnect the programming wire by pulling both ends from the computer terminals Do N O T disconnect the program ming wires from the console by pulling on the wire because the wire may break A ll programming wires should be disconnected...

Page 8: ... above it In order for a light to turn O N to lig ht current must flow THROUGH the light The electrons must flow IN on one wire and OUT on another w ire This is the closed circuit principle for lights The terminals labeled A and B on either side of each light are used to supply the electrical power to turn the light O N A light comes O N when terminal A is connected to one power supply terminal or...

Page 9: ...be disconnected after each experiment is completed V Any of the lights may be operated by connecting programming wires from to A and from to B just as was done for light 1 Make connections to two or more lights at once IB The circuit diagram looks like this The lights are used in later experiments to represent numbers The light O FF w ill represent a zero 0 and the light O N w ill represent a one ...

Page 10: ...and Z The three contacts for each of the six pushbuttons are all connected to terminals in the same manner When the pushbutton is UP an electrical connection is made between terminals Y and Z When the pushbutton is D O W N the electrical connection is switched to terminals Y and X Terminal Y is connected to the common contact and is always used when the pushbutton is connected in a circu it When a...

Page 11: ...use the circuit is closed through the switch Push up and down slowly on pushbutton 1 and carefully watch the operation of the two lights One light always goes OFF before the other light comes O N There is a position with the pushbutton only partly depressed where both lights are OFF Try to find this position The switch breaks one connection before it makes the other connection The pushbuttons are ...

Page 12: ... time and see light 2 go O N A complete circuit is now made through both pushbuttons It is possible to connect more than two push buttons in series and make a circuit where aM the pushbuttons connected must be pushed down before the circuit is completed Construct a series circuit using three or more pushbuttons by your self to demonstrate this principle The circu it with terminal numbers indicated...

Page 13: ...down both pushbutton 1 and pushbutton 2 at the same tim e The circuit is closed and the light comes O N if either pushbutton 1 is down OR if pushbutton 2 is down OR if both pushbutton 1 and pushbutton 2 are down at the same time 1 0 6 More than two pushbuttons may be connected in parallel to make a circuit where any one of the pushbuttons may be pushed down to complete the circu it To demonstrate ...

Page 14: ...own in a circuit diagram the contacts are ALWAYS shown with the relay O FF Notice that terminals H and Gand terminals L and K are not connected when the relay is O FF Also terminals H and J and terminals L and N are not connected when the relay is O N The MINIVAC relays are mounted on the computer panel with the contacts of the relay switch visible The relay arm is in the middle between the other ...

Page 15: ...en the relay is O FF and to turn light 1 O N when the relay is O N for this circuit is 1 G 1A 2B 2 Turn power O N Light 2 comes ON A G ently push the relay crossbar to the le ft Light 2 goes O FF and light 1 comes O N Watch the relay arm alternately touch one contact and then the other as the relay crossbar is moved back and forth The circuit looks like this 1G 1A IB 1 13 ...

Page 16: ...s fv opera he i Relay Switches jm m j Je th r in 2 lsConnected hSwitches USHT Three terminals are located directly above _ each relay on the computer panel These OO o O 7 i i i i H J terminals are connected under the panel to the relay c o il Two terminals are connected A directly to the relay c o il and the third O O J terminal is connected to a light wired in t N series with the relay coil as sh...

Page 17: ...Now connect the other set of relay contacts 1 K 1L IN to two unused lights so one lij comes O N when the relay is OFF and the other light comes O N when the relay is O N Try this yourself To modify this program so that the coil indicator lamp w ill light when the coil of relay 1 is energized remove connection 1 1 E add connection D y lC The circuit for this modified part of the program is 12 1 iy ...

Page 18: ...he switch contacts of relay J_ supply power to relay 2 by closing the circuit to the coil of relay 2_ Release relay 1 and press pushbutton 1 Relay 1 is turned O N by pushbutton 1 relay 2 is turned O N by the switch contacts of relay 1 and light 2 is turned O N by the switch contacts of relay 2 Thus the pushbutton controls relay 2 through the contacts of relay 1 5 1 It is possible to connect severa...

Page 19: ... interrupts current flow through the coil and turns the relay O FF The relay indicator light turns O FF and shows that the relay is no longer energized The relay circuit has now returned to its original condition Operate the circuit back and forth a few times by first pushing push button 1 then pushbutton 2 The circuit used in this experiment is called bistable because it is able to remain in eith...

Page 20: ...mmed on the computer and it may be used for other computer switching functions as w e ll Each of the six slide switches has six terminals A O 0 located directly above it on the computer panel These terminals are connected underneath the panel to the slide switch contacts The terminals are labeled R S T U V W and are connected in the same manner for all six switches Each switch is identified by its...

Page 21: ...B 1A 1 R 2A 1W 1S 1 1V 1S 2 Move switch 1 to the LEFT and turn the power O N V Light 1 comes O N but light 2 remains O FF Trace the closed circuit for light 1 and the open circuit for light 2 on the circuit diagram 4 Move switch 1 to the right Light I goes OFF and light 2 comes O N Trace the open circuit for light 1 and the closed circuit The circuit for the experiment looks like this 19 ...

Page 22: ...of contacts on the rotary switch dial in turn The wiper arm rotates with the pointer knob and makes an electrical connection with each set of contacts in turn around the rotary switch dial see the following illustration The contacts are designated by D Decimal Input Output 8 terminal number 1 to 19 for example D8 The contact on the wiper arm is referred to as D16 For example when the pointer knob ...

Page 23: ... before making connection with the next contact The switch operation is described as break before m ake and thus is sim ilar to the pushbutton switches Rotate the pointer knob back and forth a few times between numbers 1 and 2 Connect several other lights to the rotary switch terminals to demonstrate that an electrical connection is made from D16 to each term inal More than one terminal may be con...

Page 24: ...s terminals 18 and 19 stop to halt the motor drive RESISTORS The electrical resistors used with the motor drive limit the current which flows through the circuit in the same way that the lights limit the amount of current which flows through a relay c o il The resistors make it possible to connect a short circuit across the STOP terminals to stop the motor without over loading the power supply DEC...

Page 25: ...he motor drive again stops this time because power is no longer connected to the motor circu it 6 z 6 Y 6 X Pl9 MOTOR DRIVEN ROTARY SWITCH This experiment demonstrates how the motor driven rotary switch may be used to generate electrical pulses for the computer and to automatically perform a series of operations in sequence J I Connect the motor to operate with pushbutton control using the circuit...

Page 26: ... a series of computer operations are called a program All digital computers including MINIVAC 601 must be programmed to solve a specific problem The use of the rotary switch for programming is explained and demonstrated in future experiments I 1experiment 1 4 MOTOR REVERSING I IJ Connect power to the rotary switch motor through two sets of slide switch contacts so that the direction of current flo...

Page 27: ...ms When the computer is programmed to play tic tac to e the various plays are recorded by making connections on the matrix terminals When the computer is programmed to recognize characters the characters are formed by making connections on the m atrix Games and character recognition problems are presented in other books in this series AUXILIARY TERMINALS A uxiliary terminals are provided between t...

Page 28: ...tes Processes information and controls its operation making logical decisions and performing arithm etic Generates output information representing answers to a problem The components generally used in modern digital computing equipment are discussed and their operation is compared with the operation of analogous components in M IN IVA C 601 tSHOW d e c is io n s Book III provides an introduction t...

Page 29: ...sed in high speed digital machines the Binary Arithmetic Operations are explained and demonstrated with appropriate programs for M IN IV A C 601 Book V uses M IN IVA C 601 to demonstrate how computer functions may be combined to perform specific jobs Examples of computer applications are examined under five major headings Simple Computer like Devices Encountered Every Day Computer Applications in ...

Page 30: ...relay 1 comes ON and remains ON when pushbutton 1 is pushed and released Relay 1 goes OFF and remains OFF when pushbutton 2 is pushed and released Terminal 2Z may not be used for this problem Refer back to the relay experiments if you have trouble with this problem 10 Design a circuit in which relay 1 comes ON when pushbutton 1 is pushed if slide switch 1 is left and relay 2 comes ON when pushbutt...

Page 31: ...i i 2B 2 Jll 2 J 1 1Z 2 Z ANSWER 2 1 1Y 2Y 1A 1Z 2X 1B l 1V 2 Z ANSWER 3 1 1Y 1V 2Z 1V 2X 2Y 1A 1B l ZX zz ZY 1 2 X ZY 1A Z Z ZB 1 ANSWER 4 1 1Y 1Z 2X 1X 2A 2Y 1A 2B 2 1B l 2 Z 18 1 ANSWER 5 1 1S 1S 1 Y 1Y 2Y 2X 1X 1V R 1V IA 1B l ANSWER 6 1 1Y 2V2T 1V l R 2S 1A 1S 2Y 1 1B 29 ...

Page 32: ... 1 2 2 B 2A 1T 2 2F 2C 1U 1 1B 0 1A lR lS 1 2A lT 2 2F 3 o2B 2e i 2C W IV t l IF IE 0 l6 1W ANSWER 9 1 1G 1G 1X 1Y 1H 1H 1C 1F 1 1F 2Y 1E 2X 2Z not used 1 J ANSWER 10 1 1 Y l l S 1R l C 1T 2C 1F 1 2F 2 1R 1C 0 IE IF toeoc 2C IT IS IX 1 2 iy 1 0 1 ANSWER U 1 1H 1H l Y 1Y 2Y 1X 1C IF 1 2X 2C 2F 2 1G 1R 1S 2S 2T 2J 2H 1A 1 B 2 30 ...

Page 33: ... G 2J 2S 1 H 2H 2 iy IX i 12 Q Q JU U U U 22 1 C jE IF 1 2V a JtM i 2X 2C 2B 2F 2 ANSWER 13 6 6Y 6 6A 6B 6 6VD17 D18 M 6B 6m Dll M 6Y 64 p is P19 ANSWER 14 5 5Y 5Z 6X 6Y D17 M D18 5X 5Y 5 5Z 6X 6y P17 M D18 D19 answ er 15 6 6X 6Y D17 M D18 D18 5X 5Y D19 6 ANSWER 16 5 5Y 5Z 6X 6Y 6J 62 5 X 6Z 6C 6F 6 6J 6K 6 6G 6G 6N 6L D18 6H D17 ...

Page 34: ... 6 5 Z P17 PIS 5 Y M Plfe P l9 po ANSWER 19 D1 1A 6 6Y D2 2A 6 D17 D3 3A M D18 D4 4A M D16 D5 5A D6 6A 1B l 2B 2 3B 3 4B 4 5B 5 6B 6 M PJ 7 26 1 1 OgL 3 33 v l 3 A P3 T I 4A P4 5 5B i 5 A V 6 6B O 1 a 6A Pt T 7 7 6X b b Z bY M D ie M 6 0 9 ANSWER 20 1 1 B 1 1C 1A 1 E 1E 2G 1F 2F 1H 1F 1G 1Y 1 Y 1 1V 1J 1J 2H 2J 2E 2E 2A 2B 2 2 2C 3 z ...

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Page 36: ...M IN IV A C 601 AN D THE M IN IV A C M ANUAL ARE PRODUCTS O F i l k SC IEN TIFIC DEVELOPM ENT CO RPO RATION 372 Main Street Watertown Massachusetts ...

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