*[[M4 Board]] (RTC, ROM management)
*[[SYMBiFACE II|SYMBiFACE II]]
*[[SYMBiFACE III|SYMBiFACE III]] (not tested, RTC and USB mouse)
*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