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Autotote that Bob mentions, was Automatic Totalisators Limited's American subsidiary company, which started out with the name ATUSA (Automatic Totalisators USA). The Georgetown USA PDP8 system developed by the company was the world's first totalizator based on minicomputers and followed the Honeywell 200 based system developed by the company for the NYRA (New York Racing Association), which was the world's first computer based totalisator system.
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When Bob Plemel informed me that the PDP8s in the tote system shown above pre-dated the PDP8/I and could have been built by Automatic Totalisators Limited's American subsidiary company in America, I started to wonder if it could be the Georgetown system which was the first of the PDP8 totalisator systems. I compared it to an image of what was thought to be the Georgetown system shown below and they certainly look the same. I suspect that the image above, as it is the front page of what is obviously a marketing/sales document, would have been based on a milestone system. As the PDP8 system at Georgetown was the world's first minicomputer based totalisator I think it is highly probable the image above is of the same system.
The following description is written with reference to the image above, only because it shows greater detail, as it also applies to the image below. On the right hand side of the blue workbench, which spans all of the racks, bar the space occupied by the two control consoles, there are three PDP8 Minicomputer control consoles and two Paper Tape Punch/Readers. Their front panels are immediately above the blue bench. Of these front panels in the right hand five racks, the PDP8 consoles are in the racks that have the double brown doors above them. Near the middle of the blue workbench, are two TCCs (Tote Control Consoles) with their specialised keyboards in the bench with Board Control Units (BCUs) above them. Above the left hand end of the workbench are three Scanners, which interface the TIMs (Ticket Issuing Machines) to the computer systems. The centre opening doors in every rack hide all the electronics backplanes and wiring.
Probably the Georgetown totalisator
The PDP8/I based totalisator, developed for the Royal Hong Kong Jockey Club's Happy Valley track, which Bob Plemel mentions at the top of this page, is shown in the image below. Also shown in the image below, is Bob who is standing. The letter "I" appended to the PDP8 name signifies that this model of PDP8 has a hardware implementation utilising integrated circuits. The Happy Valley system below, as is the Georgetown system above, a Triplex system which was based on 3 PDP8/Is. These consisted of three CPUs each capable of performing the functions of Master, a hot-standby Slave or a Catchup mode machine.
Max Burnet, was the CEO of DEC Australia (DEC - Digital Equipment Corporation), the company that manufactured the minicomputer systems Automatic Totalisators Limited (ATL) based almost all their computer era totalisators on. DEC and ATL had a long relationship spanning many generations of computer starting with the PDP8s followed by the PDP11s and later VAXs ending with the Alphas. ATL was a class of customer of DEC termed an OEM (Original Equipment Manufacturer.) Max gave me a copy of his DEC Australia history DVD. In this history is a list of customers and machines titled At this time the earliest installed machines were:- which records Automatic Totalisators having two PDP8s with serial numbers 564 and 740. These pre-date the PDP8/Is and were termed Straight 8s. From these serial numbers Max estimates these would have been 1964 models well pre-dating the Happy Valley project. Max speculates that these machines were probably in the ATL Research department or the ATL Development Lab. I have met multiple ex DEC employees, including Max, who believe that ATL was significant in getting DEC Australia established.
It is interesting to note that in the DEC History DVD list, PDP8 serial number 564 is recorded as ending up in the NSW SU Museum. Regarding the ex ATL PDP8 being donated to the SU Museum, Max wrote the following: It sounds like Bill Johnson gave one of these to the university when it reached end of life. William Johnson wrote the following about this: I bought the 4 PDP-8s from Harold Park and Wentworth Park. Eventually sold them to deserving technical persons. The first PDP-8, all transistor, from research I gave or sold to my nephew Max and it ended up outside the maths department at the University of New South Wales.
The Happy Valley system being developed
To the left of centre in the above image, towards the bottom in the two racks that can be seen full length, there are groups of five cable looms dangling down and joining into a single horizontal loom. This is the wiring that connects the TIMs (Ticket Issuing Machines) to the front end system of the totalisator. The front end system consists of devices called Scanners which Automatic Totalisators Limited designed and manufactured to interface with the TIMs and indicators which the company also designed and manufactured.
Note that in the image below, when the system enters its operational phase, double sided doors below the workbench are fitted to protect the cabling and improve aesthetics. Similarly when comparing the image above with the one below, double doors are fitted on the upper section of each rack when all the work on the backplane wiring is complete and the development phase ends. The person seated in the image above seems to be working on one of the backplanes. Additionally, during the development phase, in the image above, the workbench is a hindrance in gaining access to the equipment racks so it is only installed when the computer system enters the operational stage as in the image below.
There seems to be an almost circular, tyre sized feather duster lying on the floor under the cabling mentioned above, in the image above.
The Hong Kong PDP8 Totalisator System at Happy Valley
The Tote Control Console or TCC visible in the image below, which belonged to the Happy Valley totalisator in Hong Kong, can be seen in the image above on the far right hand side on a separate table. Bob Plemel, shown on the left hand side in the image below, made the following comment about this TCC in the image above: I remember that in Hong Kong they were mounted in a custom made teak wood desk - very posh for a tote.
Bob Plemel and the PDP8 TCC
Bob Plemel also mentioned that the TCC in the above image, which was photographed in the Meadowbank factory, was a spare. The Royal Hong Kong Jockey Club wanted a spare TCC. Spares are always a good idea to eliminate single points of failure.
A video camera can be seen on a tripod on the left hand side of the above image. Bertha Schoder an ex Automatic Totalisators Limited wiring expert recalls that a production company were making a film of the Happy Valley totalisator system in the Meadowbank factory. Bob and I were having trouble identifying the man on the right hand side of the above image however Bertha suggested he belonged to the film production company.
Neville Mitchell, an ex ATL Manager Engineer and draftsman made the following comment about the TCC in the above image:
I do remember being involved with the design of the RHJC Tote Control Console under the guidance of Peter Rolls. All of the push button keys were made in Germany and assembled into rows by RS Rubin & Co in Whiting Street Artarmon. The keys were mechanically interlocked some with only one key in the row being enabled at the one time others with individual latching but with a cancel key on one end of the row. The mechanical designer was design draftsman Bill Bryant he was also responsible for the six foot racks and the various ATL control panels, eg scanners, Indicator control etc.
It's a great photo of Bob, I too am puzzled what the other guy's name is, I just know I knew him!
The image below shows a close up view of the backplane wiring which shows detail of what appears in the upper parts of the racks in the image titled The Happy Valley system being developed shown in the image above. The image below also gives a good view of part of the PDP8/I console.
The PDP8 Backplane - Photo by Max Burnet and Peter Watt:
As I looked closely at the PDP8 console in the image above, I noticed something interesting about this console. Along with the text on the front panel identifying the lights and switches, on the left hand side there is a machine code program titled Rim Loader consisting of two columns of octal numbers. You don't see that these days, as this program has been stored in ROM for most of my time in the industry and I started in the 1970s. It relates to the ostensible paradox of how do you load anything into main memory to be executed if there are no instructions in main memory to be executed? The solution to this was called the Bootstrap Loader. It gained its name from a similar ostensible paradox of Why can't you pull yourself up by pulling on your own boot laces? The Bootstrap Loader was a small program which could be, relatively easily, toggled into main memory via the console switches which when executed loaded another loader called the Binary Loader. This was a more extensive loader capable of loading the operating system. The Bootstrap Loader imprinted on the console of the PDP8 shown above consists of two columns, the first consists of addresses into which the instructions are loaded and the second column contains the instructions to be loaded into those addresses. I can recall a short period at the beginning of my time in the computer industry of having to toggle in the bootstrap loader to start the computer up.
Max Burnet wrote the following about the work Rob Stone is doing at Harold Park shown in the image below, which is performing field changes on a panel like the one shown in the image above: When Rob Stone talks about re-wiring the PDP-8/I, this is the daunting wiring complexity that he faced. The photo shows the PDP8/I backplane. Factory wiring was done in red. Field changes were usually done in yellow.
Rob Stone with Duplex PDP8 system at Harold Park 1970
The Harold Park system which Rob is working on in the image above, was the first computer based totalisator in the Southern Hemisphere. Rob wrote about this job:
I was given responsibility for installing the computer systems at Harold Park and Wentworth Park, supported by Peter Rolls, Ron Hood, Kevin Franks etc. in Installation, George Klemmer and team in Research, Dick Sterndale-Smith and programming team under George, Neville Mitchell Alf Lesins and team in the Drawing Office, and Alan Lakeman Bill Johnson and team on track
Max Burnet wrote the following: The first PDP-8 that DEC made around 1965 was made of transistors and diodes.(These were the R for red modules). Over time it has become called the "straight" 8, or the "classic" 8. I remember this hardware implementation well, based on the DTL logic family (DTL-Diode Transistor Logic). I also remember the RTL logic family (RTL-Resistor Transistor Logic). Most of my decades repairing computer systems, were spent working with the TTL logic family (Transistor Transistor Logic). In later years this became increasingly MOS and CMOS logic families (MOS - Metal Oxide Semiconductor and CMOS - Complementary Metal Oxide Semiconductor.) Every now and again I was fortunate enough to come across some ECL based logic which provided a bit of variety. (ECL-Emitter Coupled Logic.) I think the discrete component computers were more interesting to work on, although I was well entrenched in the Integrated Circuit era. The more interesting time was spent with small to medium scale integration with increasing levels of integration reducing interest. I did end up spending significant time with Large Scale Integration implementations. Large Scale Integration and implementation of Surface Mount technology, respectively reducing cost of systems and making it difficult to replace components, for example, eventually led to component level repair of computers becoming impractical and cost ineffective. I spent an increasing amount of time on the software side of the industry eventually ending up in management.
Following are extracts from three issues of the ATL company magazine called Tote Topics. When I started in the computer industry, it was well established, however still at a time when there were no personal computers and most people had never seen a computer. It was about 17 years after having started in the computer industry that I purchased my first PC and several more years till I had my first smart-phone. Prior to the PC, if I wanted to write a memo at home, with no access to the work computers, I had to use a typewriter. At work I would use an editor to create a text file as there were no word processors. If you wanted to create a large document, like a specification or a manual, you would use a mark-up language, of which HTML is an example. This made it easier to make changes to the document without reformatting everything. I spent far too much of my life on deserted racetracks working on problems in the middle of the night and into the wee hours of the morning, unable to make any phone calls, as it not only pre-dated any mobile phones, it was illegal to have land-line phones on the track. I recall the problems the early systems analysts had introducing computers into workplaces which had no shortages of experts in the customer's business yet none of them had the slightest idea of what a computer was, what it was capable of or what a human interface with such a machine might look like. When computer systems were introduced, the people who were being inducted into computer operations were generally apprehensive about it. I well recall the common scepticism regarding their introduction that is reflected in the following article. When I was part of the introduction of computer based totalisators to the five major race-clubs in the Brisbane region, there was next to no knowledge of computers amongst the racetrack staff at all. More widely than this, Queenslanders in 1978 being rather parochial at the time, did not seem to me to have any knowledge of computers, bar the few people working in the industry. At an early tote operation, where the air conditioning was struggling to maintain a safe operating temperature for the totalisator system, the ATL branch manager suggested hosing the system down!
I find it fascinating that the first article below shows that at the time of writing, the definition of the word computer, had a long way to go to reach the generally accepted meaning it has today. The writer, P.J.G., prefers to not use the word computer but the words, electronic totalisator, instead. Keep in mind that long ago the word computer referred to a job. You could be employed as a computer!
Following is an article in Tote Topics No.16 April 1968:
In a number of articles, of which this is the first, a non-technical explanation of their characteristics will be given to endeavour to eliminate this "mis-information". Much more technical descriptions are available to anyone interested, but most people are not concerned with the "gory" details of gates and bits and buffers, flip-flops and program loops. These can safely be left to the engineers designing the system. What is required by the majority concerned with racing is a broad appreciation of the system from the point of view of the user. This it is hoped to give.
To anyone associated with Racecourses a number of questions immediately arise,
and many others. The last question is usually, Should we have one?
Shorn of all its appendages and complications, the heart or core of any totalisator is merely a series of counters or adding machines. For any given pool, there is one to count the bets on each horse or combination. This is the quintessence of the machine and the irreducible minimum beyond which it is impossible to go.
Of course any practical totalisator contains very much more than this. The additions, which necessarily complicate the whole system, are directed to two main ends. These are, firstly to provide better service to the betting public and secondly to protect the system from error as far as is humanly possible.
In the first case we must provide for a number of pools and a number of different values of bet. These must be available from a multiplicity of ticket issuing machines distributed throughout the course. The odds, calculated from the bets already placed, must be automatically calculated at frequent intervals and the display up-dated. When the race is over, the dividends must be rapidly calculated so they are ready for display and payout when correct weight is signalled. These, and many other features, are all directed towards better service to the punter.
The second group of complications arise from the necessity to ensure a virtually error-free operation. They are of intense interest to the operator of the totalisator, who usually has to foot the bill for any malfunction of his machine. They start with the complete checking of the bet for legitimacy of runner, pool, code, and possibly value. These must all be certified correct before a ticket can be issued. The checks continue, through the check of the horse totals by a grand total, right through to the check of the final dividend, and the complete accounting for the race which must be balanced before payout can begin.
So, even though a totalisator is fundamentally very simple, the practical realisation of a reliable machine is quite an extensive and complicated piece of mechanism. One, moreover which must be capable of quick and easy operation, adjustment and, if necessary, repair.
It should be noted that the word Computer can be used, quite correctly, to describe anything from a small group of relays to a full scale digital computer. It is used here in the latter sense only. Because Computer is liable to misinterpretation and misrepresentation in this regard, we prefer the term electronic totalisator as it is rather more precise.
The characteristic which distinguishes digital computers from ordinary calculating machines is their ability to carry out a whole series of calculations, according to a list of instructions, without human intervention. These instructions, called the program, tell the computer in the minutest detail what to do. They are normally stored away in the machine memory to avoid delay in obtaining the next instruction.
With this programming capability, it is obviously possible to store instructions on how to check and service a ticket issuing machine, or how to do the necessary calculations and even how to control the indicator boards. These are all, of course, in addition to the primary purpose of counting bets.
When all these facilities are added together we have the full scale Electronic Totalisator. The ticket issuing machines are all connected to a large switch, calld a Scanner, which connects them through, one by one, to the input of the computer. The bet information keyed into any ticket issuing machine is checked, in its turn, by the computer and a signal sent back to print a ticket if all information is correct. The bet information is stored away in the computer memory with all other similar bets. Periodically, odds calculations are done on the stored information and the results are printed out on high speed printers and also posted on the indicator boards. These boards are controlled by the computer through a switching device called a Board Control Unit.
The betting Program is stored in the Memory and contains the step by step instructions for controlling the ticket issuing machines and the indicator boards, as well as calculating and printing out dividends and all race information. The whole system operates quite automatically, and human intervention is only required to stop and start various phases of the operation or put in information such as the list of valid runners or the winning numbers. This is all done through the keys and switches of the Totalisator Control Console, from which the whole operation is controlled.
A Totalisator Control Console or TCC, mentioned in the previous paragraph, can be seen in an image above titled Bob Plemel and the PDP8 TCC. In the next article, the sound produced by the electromechanical totes is mentioned. A lot has been spoken and writen about this. Engineers who worked on these electromechanical Julius tote systems, have said that they could tell certain faults with the system from the sounds emanated. Following is the second article in the series in Tote Topics magazine No. 19 July, 1968:
We have seen that the Electronic Totalisator is entirely different from the electromechanical types both as regards its equipment and its characteristics. Let us look at these differences in a little more detail, because in them we will find the essential features of the Electronic Totalisator, its place in the entire scene and even the basic reasons for its very existence.
In the machine room of an electro mechanical totalisator there is motion, constant motion, and noise. With betting in progress, the constant chatter of the escapements blends with the purring of the counters and the low rumble of the drives to give a quite characteristic sound. This sound, both in intensity and pitch, indicates to the experienced totalisator operator, even more clearly than his eyes, the state of the queues outside and the conditions around the selling houses. He scarcely needs a clock, so accurately is he able to predict from the betting pattern the time to the start of the next race. The equipment consists of row upon row of shafts and gears and escapement wheels and mechanical counters. At first sight it seems entirely mechanical as the electrical portions are buried deep inside.
With the smaller "counter tote" using electromagnetic counters, the pattern changes to that of a telephone exchange. There is the click of the relays and the clack of the counters as the bets pile up. One is still left with the impression of a mechanical device with the moving counters and manual operations.
However, the position changes entirely when we go to an Electronic Totalisator. The machine room consists of one or more rows of silent steel cabinets. Lights blink continually on the front panels of the cabinets indicating the progress of betting. Every ninety seconds new odds ripple along the boards and with a staccato burst the high speed printer spews out another page of updated odds and pool figures. Otherwise all is silent and the lights blink on. The operators move quietly about, occasionally flipping a switch or pushing a button to stop betting or calculate dividends or complete some similar, but normally laborious, task in the blink of an eye.
What was the reason for this change?, this quiet revolution that has taken place in totalisator technology? There were, of course, many technical reasons concerned with the state of the electronic art but the main factor, the most compelling reason, was economy. It was simply cheaper, as well as better, to make certain totalisators this way.
For many years there has been a trend, throughout the world, toward the more complex form of combination betting. Here the dividends are large due to the many combinations, but each combination requires an adder or counter with its associated equipment, and the overall cost can become very great. However, a digital computer is capable of storing a vast quantity of information relatively cheaply and this is the prime reason for its use. The more combinations there are to bet on, the more powerful the argument in favour of the Electronic Totalisator become.
Once having decided, for economy reasons, to use a digital computer, the many other advantages of the Electronic Totalisator come to the fore. In some cases, these even outweigh the original factors and become the prime reasons for its use. What, then, are the advantages, other than price, of installing an Electronic Totalisator?
The first point that comes to most people's minds is How old is it? Is it quite up to date? Is it this year's or, preferably, next year's model? Well, the Electronic Totalisator is all these and more. With the most modern integrated circuit computers it can almost be said to be the year-after-next's model. This is particularly so when the design philosophy of the totalisator is in the forefront of world thinking on this subject.
One of the most important characteristics of an Electronic Totalisator is its flexibility. To change the betting system or the pools, re-allocate the TIMs or make provision for other displays requires little or no alteration in equipment. Normally a program change is all that is required as far as the computer system is concerned. Changes necessary with other sections of the system, the ticket issuing machines and the indicators, are usually much greater than in the computer room.
Another important point about Electronic Totalisators is their speed of operation. This is very high and the cycle time of the computing system itself is measured in millionths of a second. However, the speed of recording a bet is determined by the speed of operation of the ticket issuing machine, and is in effect the time it takes a relay to close. The delay in servicing machines is thus kept to a minimum and, assuming a reasonable delay in issuing tickets, an electronic totalisator can efficiently handle about one thousand machines.
The speed of posting the display boards is also very high. The only really suitable type of indicator for an Electronic Totalisator is the lamp box because its speed is only limited by the selector relays. Any of the older, slower types of indicator requires a buffer store so that the computer system is not delayed. This increases the cost to the stage that they can become uneconomic. With lamp boxes it is possible to change about ten figures a second and, at this speed, the change ripples along the board and the new line of odds is completed while you watch.
Some people find the speed of calculation of dividends surprising when compared with the older system. The numbers of the placed horses are keyed in and the Compute Dividends button pressed. By the time you have raised your eyes to the board the dividends flash up. In case of a decision in doubt, all possible dividends can be calculated while waiting for the final results.
Off-course money can be simply added to the on-course pools. In this case the amounts are stored separately, as well as the combined total. Odds are automatically calculated from the combined pools, a result not possible except where the pools can be amalgamated. This is easy with a digital computer but difficult by any other means.
With a computer it is possible to produce much statistical and collated information on the betting that it is not practicable to produce in other cases. And with high speed printers, which are an integral part of any Electronic Totalisator, it is possible to print this information out very rapidly. Both totalisator owner and operator can benefit by these printouts and improve their organisational and maintenance procedures.
So the Electronic Totalisator, this quiet revolution in the totalisator art, is upon us. It has produced a change probably greater than any other single item in the history of totalisators. Its characteristics are new and powerful and strange. Most of them can be used to advantage and some of them are outlined above. However, some factors are so different that an entirely new approach is necessary and a critical examination of what is required of a totalisator must be made. Outstanding among these is the question of Reliability, with a capital R, and this, together with Maintenance and Construction, forms the subject of the third article in this series.
Following is the third of the Tote Topics articles, which appeared in issue No. 20 in August 1968. It is interesting to read this very early view of digital computers and the comparison with electromechanical systems. I have often wondered why documentation of these early computer totes refer to printing the odds and pool figures at regular intervals, however I never thought that this was a means of data recovery as indicted in this article. With the rapid progress of these systems to handling many venues and far more diverse pools with increased runner combinations, this option would have quickly been rendered impracticable. There is an image with this article which looks like a monochrome low resolution copy of the PDP8 totalisator system shown at the top of this page without the promotion text. As the image at the top of the page is in colour, where the article below refers to dark doors this should be translated to brown when relating it to the image above. Another observation is that although I had not heard the term The Check On The Check I worked for decades with this ethos which dictated The System Must Work. I did receive a quip from a non technical manager once, that in his opinion my philosophy required backups of the backups for the backup! Although I got a giggle out of this obvious exaggeration, opinions along this line were frowned upon within the company and the company's customers were dogmatically persistent in conveying the message that downtime is intolerable. Contracts often had penalty clauses regarding the possibility of a downtime event.
One last comment. The following article mentions the longevity of the electromechanical Julius totes, referring to twenty, thirty and even more years. With the benefit of hindsight, I can now say that some of these systems operated for about half a century. Two of the big Julius Tote systems, Longchamps and Caracas operated for 45 and 50 years respectively.
Electronic Totalisators are so different from other types that it is not possible to apply to them the usual reliability criteria. We must, therefore, be very clear what we require in this line because the way in which it is achieved is so utterly different.
Ideally no equipment of any description should ever go wrong or give any trouble. This can never be completely achieved in practice, but with some types of equipment which are well designed and manufactured this ideal can be very closely approached. ATL Totalisator equipment is a case in point where the fault rate is extremely low. It is thus able to provide unfailing service to the punter and ensure that the owner and operator do not lose money.
To achieve these ends, two things must be done. Firstly, as mentioned above, the equipment must be designed and made as well as is humanly possible to reduce the fault rate to the absolute minimum. Secondly, precautions must be taken in the design so that the vital race information can never be lost, come what may. Let us look at these two points in turn and see how they are carried out both with electromechanical and electronic totalisators.
Excellence of mechanical design and manufacture of electromechanical equipment results in a low incidence of faults and also long life. To see that this is so it is only necessary to consider the ATL installations which are still giving excellent service after twenty, thirty and even more years of continuous work. There are many of them spread throughout the world. With electronic equipment, which is made by the large specialist manufacturers, it is, first of all, necessary to select the best available. If the overall reliability must be improved further, and this is frequently the case, then duplication and possibly triplication of the equipment is the answer. As well as providing extra equipment against the possibility of malfunction, the duplicate can provide another check against miscalculation or misreading of data.
By these means it is possible to produce an almost negligible fault rate. However, the financial consequences of any fault can be extremely serious and the second precaution mentioned above must be taken, to ensure that the pool information can never, never, never be lost. The way in which this has been done has given rise to the famous ATL phrase The Check on the Check. With electromechanical totalisators there are always several points from which the initial pool information may be independently obtained to check results, or in case of need. These points are all mechanical, such as counters, and virtually the only thing which could cause the loss of all information would be an atomic bomb!
With Electronic Totalisators the same type of counters are not used. The information is stored in the magnetic core memory of the computers and one cannot look at it and see what is there. However, an integral portion of any Electronic Totalisator is a high speed printer and in normal use the updated odds and pool figures are printed out at frequent intervals, normally between 30 and 90 seconds. Printed information, which can never be significantly in error, is thus always available.
Additional records may be made which are quite independent of the pools accumulated in the machine memory. The most usual type of these is a magnetic tape containing details of all bets. However, it takes some time to use such records which are mainly useful as a long term backup. It is also possible, as with other types of totalisator, to reconstruct the pools from the machine counters and the odds, but again this takes some time.
Hence it can be seen that the principle of The Check on the Check, i.e. the ability to obtain vital information from several independent sources, has been carried through, in its entirety, to the Electronic Totalisator. Due to the different type of equipment, the way in which it has been done is quite different but the result is just the same in completely protecting the punter and the operator against all possible types of equipment faults.
With an Electronic Totalisator all the equipment outside the machine room is familiar, and normal maintenance techniques apply. In the machine room, however, fresh techniques are required on equipment which is similar to many computer installations. Personnel to handle this equipment must still, of course, be thoroughly steeped in tote philosophy. So a new member has been added to the team. He is thoroughly versed in the micro and integrated circuits of modern electronics as well as knowing the effects of the remainder of the totalisator equipment on them.
Shown on the front page of this article is the control section of an ATL Electronic Totalisator using PDP-8 computers. The other items in the machine room, which are not shown in the photograph, are the two high speed printers, the Teletypes and the computer room indicator.
On the left of the picture are three Scanners followed by two Board Control Units with the two Totalisator Control Consoles on the desk in front of them. Of the remaining five cabinets, the three with dark doors house the computers and the other two the extended memories and the high speed readers and punches.
There is more information on the PDP8 based totalisator systems scattered elsewhere around this website:
Front of an Automatic Totalisators product promotion card
Above is an image of the front of a company promotion card relating to the PDP8 based totalisator systems. The contents of this can be read by clicking on the image at the top of this page, then scrolling down and selecting the thumbnail of the image above.
For a closer look at the PDP8 system at Harold Park, click on the image at the top of this page, then scroll up past the section on Miscellaneous Images and select the thumbnail of the vertical oblong image with associated text starting A Raceday Control Console at Harold Park 1958.
There is a larger image of the PDP8 based totalizator in Georgetown America, shown earlier in this page, with additional information. Click on the image at the top of this page, and scroll down to the bottom of the page and select the Next page option from the Nav Bar at the bottom. Scroll down and select the image thumbnail of the image of the Georgetown system shown above titled Probably the Georgetown totalisator. The required thumbnail, has associated text starting A PDP8 based totalisator computer room...
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