Personal Tech

Ian Williamson: The engineer who gave Sinclair his first micro

The remarkable story of the MK14... and its never-shipped predecessor

By Tony Smith


Archaeologic Before Sinclair Research and the QL, the Spectrum and the ZX81, before even Sinclair Computers and the ZX80, there was Science of Cambridge and the MK14 microprocessor kit. Released in February 1978 - that’s when the first adverts for the mail-order-only offering appeared, at least - the MK14 entered the SoC pipeline late in the Summer of 1977, thanks to the National Semiconductor company.

But it wasn’t the first computer kit SoC manager Chris Curry planned to bring to market. And the notion of offering a very low-cost build-it-yourself training tool for engineers and enthusiasts eager to get to grips with the new silicon chip technology was not his. It was the brainchild of a 27-year-old electronics engineer who soon turned his back on the nascent computer business and went on to become a captain of industry.

His name was Ian Williamson and by 1977 he knew as much about the inner workings and uses of microprocessors as anyone in Britain. As a young electronics engineer working for technology hot-house Cambridge Consultants Ltd (CCL), it was Williamson's job to “think the unthinkable and then find someone who wanted that solved”, as he puts it.

Ian Williamson in 2013 when he was about to retire as the CEO of Carclo Plc

As a member of CCL’s Digital Systems Group, he had already tried to interest companies in the then groundbreaking idea of creating arcade video games based on microprocessor technology. But in the mid-1970s no one in the UK was willing to take a chance on the computerised slot-machines that were changing the way teenagers got their kicks. Silicon chips were too novel for established electronics companies, and it seemed they did not fully grasp their potential.

But Ian knew that their engineers, not to mention electronics enthusiasts, really wanted to understand what silicon chips could achieve, and that meant first teaching them what how they worked and how they were used. He decided here was a market he could exploit, with a combination of a simple, low-cost microprocessor kit and a step-by-step guide explaining how it worked.

“What I could see was this incredible thirst for knowledge about microprocessors,” Williamson tells The Register. “Certainly anyone who was an electronics engineer felt threatened by the technology and wanted to learn about it.

"The UK also had a well-established electronics hobby sector and there was incredible interest in what the technology could do. But it was very expensive technology to play with. And you couldn’t just buy a chip, you needed everything that went with it to program it.

“Some US companies had started to produce training kits, and there were some professional evaluation kits around, but they cost hundreds of pounds, beyond the range of any hobbyist. So I figured it would be nice to put something together that was affordable. My objective was to break price barriers.”

Cheap kit for the hobbyist

It was the same notion that had prompted Bywood Electronics’ John Miller-Kirkpatrick to devise the crude Scrumpi computer and bring it to market at the end of 1976. Scrumpi cost around £56, right in the centre of the £50-£60 price range within which Williamson felt he needed to place his own offering. But the computer lacked the numeric keypad and display of the more expensive kits on sale and relied instead on physical switches for data input and used a series of LED bulbs to present the results of calculations.

Like Miller-Kirkpatrick, Ian Williamson understood there was a untapped market for a low-cost introduction to the microprocessor, and he was driven by the same entrepreneurial zeal to sell one. In Williamson’s case, that had been instilled early on by his employer, the famous CCL.

Williamson joined CCL in 1974. The company was founded in 1960 by three Cambridge graduates – Rodney Dale, David Southward and the late Tim Eiloart – to “put the brains of Cambridge University at disposal of the problems of British industry”.

By the time Williamson arrived, CCL had become one of UK’s most influential independent R&D houses. Its formidable reputation was built on hiring bright, capable and driven engineers and scientists – either straight out of Cambridge University or, like Williamson, from the pool of Cambridge graduates who had established careers in industry.

Cheap by design: Bywood Electronics’ Scrumpi 2

In Williamson's case, that meant a five-year apprenticeship with GEC’s Marconi Space and Defence Systems in Stanmore, Middlesex. Williamson went in as a 17-year-old school leaver. It put him through university, where he studied electronics and engineering at Christ’s College, Cambridge, and he returned there after graduation to develop digital control systems for satellite ground stations.

The trouble was, after university, Ian became “really uncomfortable with the pure defence focus of the work” at GEC-Marconi.

It was time to move on. “I jumped to go to CCL... and worked on various projects involving digital system design and was therefore was involved in some of the first microprocessor applications. So I was in a privileged position and by 1975-76 I was fairly experienced in the using the very early chips.”

CCL was no mere think-tank. It was at the heart of what would become known in the 1980s as Silicon Fen, home to almost all of Britain’s most dynamic technology startups.

CCL was a thoroughly commercial operation and it encouraged its engineers to think entrepreneuriallly. Workers at other companies could rely on being told what to do by their managers, but CCL’s smart young things were expected to come up with ideas and work themselves - and to go out and sell their notions to potential clients.

That was easy for a sales rep with a charming manner and a glib tongue, but to be able to pitch successfully, an engineer or scientist needs not only a high degree of technical competence but also a deep belief in the concept being sold. That inevitably caused some to consider cutting out the client and doing it themselves.

Training day

CCL co-founder Tim Eiloart, for instance, had established Cambridge Learning Enterprises to produce and publish self-instruction guides on technology topics. Ian Williamson had already penned one of these on digital electronics, Microprocessors and microelectronics: a self-instruction course from Cambridge Learning.

This emphasis on education and training shaped Williamson's conception of what his low-cost kit could achieve. He wasn’t setting out to make a cheap general-purpose computer but a simple system to give people a chance to learn about the new microprocessor technology.

The first step: build a prototype. The National Semiconductor SC/MP processor, aka the "Scamp", was the obvious choice for a low-cost kit since it was readily available and rather cheaper than rival offerings. It was unsophisticated and easy to learn to code. Memory was easy to buy too; 256 bytes would be sufficient.

But what about the display and the keyboard? Ian reasoned that an ordinary calculator might prove a cheap source of a keypad and an eight-digit LED display, so he bought himself a Sinclair Cambridge calculator, took it apart and examined the components.

Hooking up the input and output pins on the Cambridge’s main chip to an oscilloscope, he quickly worked out how the device read and interpreted a button pressed on the keypad and how it presented numbers on the display. With that information, he wrote a 512-byte program to allow users to key in their own program instructions on the calculator’s numeric keys and run them on the kit’s SC/MP processor. For the tutorial he wrote a small set of simple “noddy” programs that users could type in to see the machine at work.

National Semiconductor’s IntroKit and its keypad add-on
Source: Colin Phillips

There was a broad template for this: National Semiconductor itself offered a low-cost SC/MP evaluation board called the Introkit for around the same price as Miller-Kirkpatrick’s Scrumpi, but which was designed to be hooked up to a teletype. However, as an alternative method of input and display, the IntroKit could make use of what National Semiconductor called the KBDKit, which was essentially a pocket calculator repurposed as an input device and screen.

Using the Cambridge parts put some limits on what Williamson’s own machine could do. Microprocessors were then typically programmed by feeding them instructions and data as pairs of numbers written in hexadecimal notation: the two-digit hexadecimal "machine codes" used to represent each of those instructions.

Unfortunately, the Cambridge calculator chip – which Ian decided could be put to work monitoring the keypad and controlling the display electronics – could only output numbers. It could easily present any single digit from 0 through 9 but not the letters A to F. That ruled out being able to display hexadecimal numbers. So he employed a different notation: octal, which only uses the digits 0 to 7.

Entering and reading octal numbers was a hassle, of course, but Ian decided that anyone who could only afford a £50 kit would be willing to put up with it. “I figured beggars can’t be choosers. You could buy a £300 kit from the US or a £50 kit in the UK and you would still learn the fundamentals of microprocessors even if you were using Octal.”

Calculator chip

He adds: “The calculator chip was driving the digits. I interrupted the IO of the calculator chip so when the Scamp kit wanted to display something, it just sent eight digits to the calculator. I just drove an eight-digit value into the register.

"It was a classic bit of down-and-dirty electronics and a very, very cheap way of giving a reliable IO, but it meant that your machine code had to be expressed with numbers – I didn’t have the option of A, B, C, D, E and F as a display output.”

Williamson still has the prototype. It has the kit’s key chips: the SC/MP processor, the 256 bytes of RAM and 512 bytes of ROM, all connected by wires rather the fine, etched metal lines of a finished product’s PCB.

“I’ve still got the breadboard in the loft and it basically has a red Sinclair calculator stuck on it with a wire-wrapped board attached," says Williamson. "And because I was using the calculator chip to do the keyboard scan and the display, there weren’t many components behind it. I think the Scamp at the time was £10 apiece; an Intel 8080 was about £60 apiece. So a £5 calculator, a £10 processor and probably another £3 in components.”

Ian Williamson used a Sinclair Cambridge Memory, like this one
Source: Nigel Tout/

Between the time Ian Williamson started working on his microprocessor kit project, in the spring of 1977, and July of the same year, he applied for and was offered a job at nationalised car firm British Leyland’s buses, trucks and tractors division, Leyland Vehicles.

The firm was based in Preston, Lancashire, but he had the chance to become the firm’s Principal Electronics Engineer. Three years previously he had quit GEC-Marconi to escape the morally questionable world of defence work, but even in Cambridge he found himself being dragged back into defence work. “I had this idealistic notion that in the real world you help people with real jobs,” he says.

Accepting the job offer from Leyland Vehicles would allow him to do just that, but it was nonetheless a very big career change involving a move far away from friends and colleagues, and from the buzz of the being at heart of Britain’s technology sector. “I weighed it up and I decided to do it,” he says.

Having accepted the Leyland offer, the engineer realised he would now no longer be able to establish a microprocessor kit sales business. Yet he was unwilling to simply shelve the project and chalk it up to experience. He could still make it pay, if he could sell the device and documentation to a third party with the resources to offer the kit as a commercial product.

Wanted: production partner

At the start of the development process, Williamson had sounded out his CCL bosses to see if the firm was interested in commercialising the kit, but they weren’t keen. Now, during August 1977, while he worked out his notice period, he approached two other companies in the Cambridge area who might have the imagination and expertise to bring his product to market.

One was a maker of electronic instrumentation and simple kits for enthusiasts, but it proved no more receptive to Ian’s ideas than CCL had been. The other was Sinclair Radionics.

It was an obvious choice. Radionics had, after all, made the calculator he had used for parts. There were also very close ties between CCL and Radionics: Sinclair’s office in St Ives, a town just north of Cambridge, was situated in a building, The Mill, which was owned by CCL. Rather a lot of Radionics’ employees had been lured away from the technology consultancy, among them co-founders David Southward and Rodney Dale.

And Ian had a special way in: a few years before, when he had been looking for a way out for GEC-Marconi, he had turned down an offer of a job at Radionics. He had declined the chance to become an engineer at the company offered by none other than its founder, Clive Marles Sinclair.

Ian Williamson collaborated with Rodney Dale and Tim Eiloart in this Basic programming course in 1979

Radionics was not, however, Sinclair’s only business. Three years previously, in September 1973, CM had acquired a company called Ablesdeal Ltd - and not, as has been written many times since, Ableseal. Quite why Sinclair bought Ablesdeal isn’t known, but it gave him a ready registered company he could establish quickly and cheaply at any time.

Some 16 months later, on 15 January 1975, Sinclair changed Ablesdeal’s name to Westminster Mail Order Ltd. The move was formally recorded the following month. On 9 June 1976, he changed its name again, this time to Sinclair Instruments Ltd, at the very time the troubled Radionics was seeking financial assistance from the British government.

On 17 June 1977, Clive Sinclair, listed on the name-change form as Sinclair Instruments’ chairman, renamed the company Science of Cambridge Ltd. Sinclair would change the name of the company two more times: first on 15 October 1980, to Sinclair Computers Ltd, and then on 2 January 1981, to Sinclair Research Ltd, the name by which it would be forever remembered.

Enter Chris Curry

When Ian Williamson contacted Clive Sinclair in August 1977, the popular "face of British technology" was still working at Sinclair Radionics, and his other firm had just become Science of Cambridge.

The two men agreed to meet one evening in a pub in Bar Hill, a small village just to the north of Cambridge. Sinclair brought along a colleague, Chris Curry, who had become one of his closest confidantes.

In the summer of 1976, with the government’s National Enterprise Board poring over the company’s books, Sinclair handed Curry Sinclair Instruments and told him to establish it as a business along the lines of Sinclair Radionics in its mail order electronics heyday.

Curry set to work, borrowing £500 from his father to fund the establishment of an office at 6 King’s Parade, Cambridge, out of which 'Instruments would operate.

Then he began looking for products the company could make and sell. “To start with I was the only person there,” said Curry in a 1982 interview. “I used to do everything: placing the ads; packing kits; taking them to the post office; mending some of them; answering technical queries ... absolutely everything. Later on there was a secretary, then more and more people were involved.”

The first Sinclair Instruments product was the infamous Wrist Calculator - “a ghastly thing”, Curry would later say - developed by a Radionics designer, John Pemberton, in his spare time. It went on sale in January 1977 as a kit priced at £9.95 plus eight per cent VAT and described in the ads as “the ultimate in common-sense portable calculating power”. But it was a git to build and get working.

The "clumsy", "ghastly" Wrist Calculator
Click for larger image

"Science of Cambridge was selling a really crummy wrist calculator which Chris was embarrassed about," says Williamson, "Chris was interested [in the kit], but it was a very non-committal meeting. And then Chris turned up a week to 10 days later at CCL with a cardboard box full of broken calculators and asked if I could use any of these... and I said yes.

"I actually said, 'Why have you got some spare?' and he said, 'The Mill is built on the them'."

Curry was immediately taken with Williamson’s concept. He too had noted the growing interest in microcomputing, and he felt the kit was the right product for SoC. "I had been very interested in the computer market, buying the US magazines and seeing what was happening, I actually tried to negotiate an import agreement with an American company which had what they called a 'computer in a book'," Curry said in an interview in 1981.

He never struck a deal with the unnamed American firm, but he had Ian Williamson’s kit instead. Curry was something of an electronics buff himself - as a youth, he says, he spent many a happy hour attempting to build valve amplifiers with tubes salvaged from old televisions - and would have appreciated not only Williamson’s design but also the young engineer’s talk of the potential market among electronics buffs for a kit priced well below the competition.

Green-lighting the kit

The deal was on. “We made an agreement for them to take the product, a contract was drawn up and I signed it and sent it back,” says Williamson. “It didn’t come back - it should have done - and I had not been long at Leyland when Chris rang me up and he was very embarrassed and said Clive won’t let me go ahead with the agreement.”

The agreement offered Williamson £5,000 upfront for the kit and royalties to follow when the kit went on sale.

In fact, he had two calls from Curry. The first time, he listened while Curry asked if he would be willing to redesign the kit to use only components made by National Semiconductor, the American chipmaker which had designed the SC/MP processor Williamson had selected for his kit. As an engineer, he knew that Curry’s requested changes were entirely feasible - they would just take time and money to implement.

“But I was reluctant to do it because you’d have to start from scratch in terms of the redesign, and it wasn’t clear how they were going to get a functional keyboard at that price,” he says. He asked Curry about the keyboard; Curry mentioned the use of a very low-cost membrane keyboard. Williamson wasn’t keen on that at all, but he promised to think about it.

He didn’t have long to wait. “And the next call was ‘Clive won’t let me proceed, Nat Semi has offered to do it for free’,” he recalls. “What had happened was that when they went to get pricing on the Scamp, National said, ‘Can’t we have it all?’ Clive essentially said, ‘Go with national and cut Williamson out’.”

When Curry had approached National Semiconductor to negotiate a purchase order for the SC/MP processor, the American chip company quickly spotted an opportunity: sell him all the other components he needed too. Curry would have to buy these anyway, but working with a single supplier would simplify the process and potentially make the overall purchase less expensive.

National Semiconductor’s sales team offered him a kit design of its own, as a sweetener. SoC could have a circuit layout and silicon parts list for free - all the chipmaker wanted was Curry’s guarantee that he would commit himself to buy its microprocessor, memory and other chips.

Curry wasn’t keen on Williamson’s use of a calculator keyboard and display, or the enforced selection of octal as the device’s number-entry system. Whether it was octal that put him off or the expense of the calculator keyboard - likely the former, since the keypad cost was not significant - the National Semiconductor offer provided the perfect opportunity.

Expansion plans

The Nat Semi kit also had expansion possibilities, an opportunity Curry would make use of to sell add-on products to buyers – such as extra memory and chip blowers – after the board itself had gone on sale. But so did Ian’s prototype. He had already devised an interface to allow his kit to be connected to a TV screen as a display and he planned to add a Basic interpreter. It would be loaded in from cassette, so he had in mind to build add-in hardware to drive a domestic tape recorder. He even had a notion that this expanded system might be operated through a kind of on-screen keyboard with a lightpen.

“Before you know it, you’ve got a full computer,” he says. “There was in my mind a roadmap that led down that route, but I effectively stopped working on it at that mid-point of 1977.” The Leyland job offer had put paid to any plans he might have had to expand his kit into a complete home computer system.

Curry would later dismiss Williamson’s original work, saying: “We nearly went ahead with an inexpensive home computer which would have been based on the use of a calculator chip for keyboard and display. Eventually, we went away from the use of a calculator and used more conventional interfaces to provide a display and keyboard - and produced the MK14.”

The MK14’s schematics
Click for a larger image

Yes, the product now had a name: MK14 - "MK" for "microprocessor kit", so pronounced "em-kay" not "mark". It wasn’t was a straightforward reproduction of the existing National Semiconductor SC/MP evaluation system. Always mindful of cost, Curry had the Nat Semi board "cost-engineered" downwards: the design was tweaked to make use of fewer, cheaper parts, among them the keypad.

The MK14’s keypad was one of its weakest components. It appears to have come from National Semiconductors’ other evaluation kit, designed before the Intro Kit and called the Low-Cost Development System (LVDS). It was a large black box onto which a number of circuit boards could be fitted, one for the SC/MP and others for memory, IO and such. It had a hexadecimal keypad exactly like the one later used on the MK14. But the keypad was not robust and often failed.

“The first [MK14] weakness, the keyboard, is more or less acknowledged by the manufacturers in as much as they provide an edge connector on the printed circuit board for an external keyboard,” wrote Personal Computer World contributor Clifford Clark in the magazine’s March 1979 issue.

“The second shortcoming is the manual, which jumps from simple memory switching to sample programs laid out in assembler format. There are statements about out-putting to the display with no instructions on how to do it.”

Don’t blame Ian Williamson for that. While he was later paid £2,000 - “over the odds”, he says - to write a programming manual for the MK14, Science of Cambridge never used it. The book, co-written with CCL co-founder Rodney Dale, eventually came out through another publisher.

The seeds of Acorn

It is not known who penned the more simple guide that shipped with the MK14 itself, the one Clifford Clark and many other reviewers criticised. Most likely it was written by one of the growing number of Cambridge University electronics and computing buffs who had been hanging out with Chris Curry. Certainly one of them – David Johnson-Davies, who would go on to run AcornSoft – wrote the manual’s sample programs.

Many of them would go on, with Curry and Hermann Hauser, to form the core of a new microcomputer company, Acorn. One of them was Steve Furber, then a maths graduate pursuing a doctorate in aeronautical engineering. But Furber increasingly found himself distracted by a newfound love of microprocessor technology.

The maths grad built the first MK14 prototype using the National Semiconductor schematics and chips: “I got the circuit diagram and built one using Verowire and solder in my front room," said Furber. "The MK14 was basically a copy of a Nat Semi Scamp development kit and they’d taken a mass-programmed ROM and copied it into two linked PROMs on the MK14. They managed to copy it wrong, and I debugged this thing in my front room. That was the first piece of work I did for them.”

Bugs such as these were fixed and the circuit diagram reproduced as a printed circuit board. The MK14 finally went on sale in February 1978, though it took three months more for SoC to begin pushing the kit out on appreciable numbers.

It sold for £39.95 plus £3.20 VAT and 40 pence P&P and, once assembled, could “handle dozens of user-written programs through the hexadecimal keyboard”. Assembly could be carried out by “anyone with a fine-tip soldering iron and a few hours’ spare time, using the illustrated step-by-step instructions provided”.

The MK14 “became a great favourite”, Curry said in 1981. “I think we sold about 15,000 of them.”

That success could be attributed to both the very low sale price and to Curry’s professional-looking ads, which stood out a mile from those offering rival microprocessor kits and the new, full microcomputers that had just begun to appear, such as the Nascom 1.

To the potential buyer, Curry’s smart ads made the MK14 look like a solid product. And if the keypad had been cost-reduced to the point at which it would break down with relatively little use, the rest of the system held up well.

But this was not the case with Sinclair Instruments’ ability to fulfil orders. As occurred with many later Sinclair computer products, the MK14 suffered from long shipment delays. Curry requested 2,000 sets of chips from National Semiconductor for the first batch of MK14 kits, but interested buyers sent it many, many more orders than that.

This left him unable to fulfil them until more components came through, which took several months. Curry never quite got the numbers right and shipment delays plagued the product throughout the remainder of 1978 and 1979.

“Chris kept me in the loop as to how things were going,” remembers Ian Williamson. “[The MK14] took the form of a normal Sinclair project, in that he under-priced it - he didn’t need to go to £39.99 - and he under-ordered.

"They committed to 2,000 units and got orders for 20,000. At £49.99 they could have put a proper keyboard on instead of what they had which became unusable in a day, but it was functional and it was successful for the purpose it was designed for.

“I don’t look at this as a big deal. I was one of the first, very few, electronics engineers who programmed microprocessors in the UK. I could see that everyone wanted to learn about it, and found a way they could do it inexpensively. [The MK14] doesn’t have anything in it that’s uniquely Williamson.”

Heavy industry

Chris Curry kept in touch with Ian while he was still at Science of Cambridge, to sound him out about developing self-learning guides for the then upcoming Acorn Microcomputer. “I remember meeting with Chris and Herman. I may have produced something around the System 1,” he says.

But apart from co-writing a few programming guides with Rodney Dale, his participation in the emerging UK microcomputing scene ended in September 1977. Williamson’s day job put him in charge of Leyland Truck and Bus’ electronics R&D efforts. “After a few years running the technology activities, I got caught up in Chief Executive Michael Edwardes’ psychological assessment programme and they decided I would be a better manager than an engineer. So at the age of 31 or so I was moved to run a loss-making gearbox company in Coventry [Self-Changing Gears Ltd]. And I’ve been running companies ever since.”

Williamson was in charge of Self-Changing Gears for five years. When it was bought by the US-based Cummins Engine Company, he was sent to run another UK Cummins subsidiary, Newage (now Cummins Generator Technologies) in Stamford, Lincolnshire. He later became a divisional executive with BBA Plc (now BBA Aviation) with oversight of a number of subsidiary companies doing £4m-5m worth of businesses.

Little Acorn: launched early in 1978 as the Acorn Microcomputer,
by 1980 it was being referred to as the System 1

In 1985, he was hired to be Carclo Plc’s chief executive. “It was a steel and wire company when I joined it - and now it’s seen primarily as a high-tech company. We have quite a significant operation in Cambridge by the Science Park which is a leader in printed electronics and touchscreens. So my career has kind of come full circle.”

Does he regret turning his back on the emerging computing sector all those years ago? “I wouldn’t be human if I hadn’t thought that occasionally, but equally I wouldn’t be able to do the job I do now if I ever regret decisions I make. To do what I do, over all the years I’ve done it, you have to have the courage of your convictions and stick with them and you don’t go back and live your life again.

“When I get an opportunity I complain about the pressures of public life but if you look at the history of Carclo over the past 10 years, I’ve been able to use a public company platform as a entrepreneur. The shareholders allowed me to take quite risky technology bets and that’s been very good. It would be nice if there was more of it. The country would be a healthier place if there was more of that.”

Ian Williamson retired from Carclo in March 2013. He’s now enjoying a well-earned break and planning his next venture. ®

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