SuperPower ROM Box
From CPCWiki - THE Amstrad CPC encyclopedia!
The SuperPower ROM Box from Micro Power Ltd. is a seven-socket Rom Box. Also called Micro Power ROM Box.
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..