The SuperPower ROM Box from Micro Power Ltd. is a 7-socket Rom Box, there is also a 8-socker version (see advert from May 1986). Also called Micro Power ROM Box.
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..
Pictures
Advert (1/2) (ACU Sep 1985)
Advert (2/2) (ACU Sep 1985)
Advert (1/2) (ACU Nov 1985)
Advert (2/2) (ACU Nov 1985)
Advert (ACU May 1986)
