The box (all boxes, or only that on the photo?) contains Programmer's Toolbox and Basic Extensions ROM.
One page - of a two page advert - is scanned, [[:File:Amstrad Computer User8509022.jpg]].
Not much is known about this interface please add..
<gallery>
Image:Amstrad Computer User8509022.jpg|Advert (1/2) (ACU Sep 1985)
Image:ACU8509023.jpg|Advert (2/2) (ACU Sep 1985)
Image:ACU8511-078.jpg|Advert (1/2) (ACU Nov 1985)
Image:ACU8511-079.jpg|Advert (2/2) (ACU Nov 1985)