https://www.cjemicros.co.uk/micros/individual/newprodpages/prodinfo.php?prodcode=VAR-MK2ROMCARTSH
4D : Product info for BBC Master/Electron Plus 1 Dual Sideways ROM Cartridge (2 ROMs) Various (S/H)
BBC Master/Electron Plus 1 Dual Sideways ROM Cartridge (2 ROMs) Various (S/H) - Hold 2x ROMS for BBC Master128 or Electron with Plus One interface
product infobbc masterrom cartridgeelectronplus