No doubt he laughed when he saw the rubber keys and the colour clash graphics, then climbed into a big robotic exoskeleton and kicked it into a whale's face.
Regardless, the much loved Spectrum offered an affordable entry point to home computing, and unexpectedly gave birth to the British games industry as we know it today.
However, success wasn't always on the cards for Sinclair founder Sir Clive Sinclair. Either side of the Spectrum, his fortunes were somewhat more mixed. Here's a loose timeline of the lesser known endeavours of this singular genius and staunch supporter of the lapdancing industry.
The amp could be used in "micro-radios" and "transmitters" - and was "ideal for modellers and experimenters". For a one-man company, the Micro Amplifier was a considerable success, and - get this - smaller than a 3d piece!
Not bad from a man who thought it was a good idea to name his children Belinda, Crispin and Bartholomew.
Unfortunately, in the above advertisement the Micro 6 appears to have been modelled by a corpse, its arm hanging limply from a mortuary gurney. Perhaps Sir Clive was foreshadowing the 1985 death of his marriage, shortly after which he briefly made a home with his former secretary.
Unfortunately, Sir Clive Sinclair believes he may have hastened the extinction of mankind through his contributions to technological progress.
He has said: "Once you start to make machines that are rivalling and surpassing humans with intelligence, it's going to be very difficult for us to survive. It's just an inevitability."
Unfortunately, to keep the costs down when it came to manufacturing its compact Cambridge Calculator, Sinclair used low quality, cheap, components. This resulted in a fault whereby, after some use, the already power-hungry Cambridge refused to switch off.
Apparently, one of the ways in which Sir Clive has reportedly liked to "switch off" over the years, is by visiting the lapdancing club Stringfellows.
One of Sinclair's most iconic products, it was a digital watch, which had to be activated to display the time. Unfortunately, the battery life was a mere ten days, the batteries were difficult to replace, and in its kit form was a nightmare to put together.
This was just the tip of an iceberg of problems surrounding The Black Watch, with so many being sent back to Sinclair for repair, that the company built up a two year backlog - and would've gone bankrupt, had the government's National Economic Board not stepped in to save it.
It was the sort of nightmare headline that Sir Clive must have hoped to avoid. Unfortunately, worse was still to come in the mid-80s, when he had a fling with 27 year-old Vicky Lee, which resulted in the memorable News of the World headline: "Sir Clive liked boffin me C5 times a night."
By the time Sinclair managed to catch up to demand, interest in the device had moved on. Consequently, Sinclair was left with a ton of unsold stock - and further financial woes.
Is it any wonder that Sir Clive later sought solace in the arms of numerous blonde women many years younger than him?
20,000 were distributed to the US - though sales were so dreadful that the majority of the US stock was returned to Sinclair HQ, unsold.
Outside of technology, Sir Clive would later invest in legitimate theatre, helping to support the career of one girlfriend, Tricia Walsh-Smith, by funding a play she wrote entitled 'Bonkers'.
Prior to this, Tricia was perhaps best known for her starring role in the children's BBC series Grange Hill, as "Mother in park". In 2008 she reached new levels of fame, when a tearful YouTube rant, aimed at a former husband, went viral.
The success of the MK14 would eventually lead to a brief relationship with Ruth Kensit, cousin of the actress and singer Patsy Kensit. At the time, Sir Clive was 55 years old, and Ruth a mere 21, and there's nothing wrong with that, probably.
According to The Daily Sport, Ruth enjoyed going on dates with Sir Clive while not wearing knickers. It is unreported whether her beau had to keep his pants on in the event of any urine leakage caused by an enlarged prostate (common in men over 50).
The successor to the Spectrum, the QL, was blighted by technical issues, resulting from a rushed production process. The launch of the QL was also overshadowed by Sinclair's other 1985 release - the Sinclair C5, a ridiculous electric trike, which would go down in history as the company's greatest folly.
Much of its failure can be attributed to its chronically ill-conceived design - handlebars beneath the thighs, virtually no impact protection, or shielding from the elements, a top speed of just 15mph, and a limp battery life (which, when it ran down, would require the driver to try and pedal the weighty machine manually).
Following criticism, Sinclair ended up having to include a hi-vis mast with every C5, so that other road users would be aware of its presence, and not inadvertently crush it beneath their wheels. Indeed, the vehicle was considered so dangerous in the Netherlands, that it was banned outright.
Fortunately for Sir Clive, there was no law preventing him, at the age of 58, getting engaged to a 21 year-old accountant called Bernadette Tynan. Sadly for Sir Clive, Bernadette would later call off the relationship, claiming to have had second thoughts the day after he proposed. Mensa member Bernadette Tynan reportedly has an IQ of 158 (just one brain-point less than Sir Clive himself).
Which might explain her decision.
Undeterred by the utter failure of the C5, Sinclair had another crack at an electric vehicle - the Zike. Billed as "The greatest invention since the bicycle", a pitiful 2,000 Zikes were sold via mail-order, and production was halted after just six months.
Sinclair later developed the Zeta - or Zero-Emission Transport Accessory - a motor which sat on the rear wheel of an ordinary pedal bike, and gave it a powered boost (it was also adapted for use on wheelchairs). It sold significantly better than the Zike, but was still a long way from the halcyon days when Sinclair's home computers threw themselves off shelves, like lemmings.
His relationship with the late Howard's Way actress Sally Farmiloe - perhaps best remembered for her affair with Jeffrey Archer and hang-gliding naked - may have softened the blow.
Though it hasn't become synonymous with Sinclair in the way some of the company's earlier products did, the Seadoo has been a considerable success for the "randy" boffin. As has - thus far - his marriage to Angie Bowness, whom he met while she was giving him a £10 "erotic" dance at the gentleman's club Stringfellows.
Despite the 36 year age difference, she once said of her multimillionaire husband: "He's actually incredibly attractive to women. You can't tell from the pictures."
Following the wedding, Lady Angie Sinclair briefly became a "lads mag favourite", and released her own "posh and sexy" swimsuit calendar... Another Sinclair success story!