Changes
The box (all boxes, or only that on the photo?) contains Programmer's Toolbox and Basic Extensions ROM.
Not much is known about this interface please add..
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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)