A very interesting article about an interesting, late (in more senses than one) and little remembered computer: https://www.theregister.co.uk/2013/06/28/30_years_on_the_story_of_the_memotech_mtx/?page=3
Coming as the MTX did from the SM1, it was decided very early on that it would measure up to the de facto standard width of a business computer, 475mm, and that it would be clad in Memotech’s trademark black anodised aluminium. The extra numeric keypad and function keys were added because the Qwerty deck alone looked lost among the acres of metal.
I never heard of a de facto standard width of a business computer before. Where did that come from?