The AD1 ROM Cartridge from Arnor is a miniature ROM board that accepts only one single ROM/EPROM chip. It was (optionally) shipped togther with Arnor ROM software (namely with MAXAM and Protext; maybe it was also used for other ROMs).
The purpose was to motivate people to buy ROM software, without forcing them to purchase more expensive multi-socket ROM boards.
There is also an AD2 version, which is expandable to hold 4 ROMs.
AD1 ROM Cartridge
Advert (MAXAM on AD1)
News (ACU May 1985)
Review (ACU June 1985)
Coupon (ACU June 1985)
Protext Cartridge Review (ACU Dec 1985)
Protext/Maxam AD2 Advert (ACU Dec 1985)
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