*[[CPC Booster]](+) and MiniBooster
*[[M4 Board]] (RTC, ROM management)
*[[SYMBiFACE II|SYMBiFACE II]](partial)*[[SYMBiFACE III|SYMBiFACE III]] (not tested, RTC and USB mousepartial)
*HD64180 Coprocessor card
*[[EPROM]] cards or EPROM simulator cards like the [[Britannia ROM Board]], [[Dobbertin]] EPROM card, [[Honeysoft ROM Board]], [[Inicron ROM-RAM-Box]], [[KDS Sideways ROM Board]], [[MegaFlash]], [[MegaROM]], [[SuperPower ROM Box]], [[SYMBiFACE II]], SuperROM Plus and others
*[[M4 Board]]
*[[SYMBiFACE II:Realtime clock|SYMBiFACE II]]
*[[SYMBiFACE III]]
*[[Dk'tronics Real Time Clock]]
*[[GEOS mouse|GEOS mouse]] ([[Commodore 64]] device)
*[[SYMBiFACE II:PS/2 mouse|PS/2 mouse]] of [[SYMBiFACE II]]
*[[USB mouse]] of [[SYMBiFACE III]]
*[[Dk'tronics Mouse Interface]]