No incompatibilities have been reported so far for the 6128 version.
The first revision of the 464 version has been found to be incompatible with the [[M4_Board|M4Board]]. A patch has been published and is currently tested. Further revisions will include the patch once tests have been successful.
The first 512K of expansion RAM follow the [[Standard_Memory_Expansions#Standard_128K-512K_Expansions_.28dk.27tronics.2Fdobbertin-style.29|DK'Tronics addressing mode standard]], giving up to 576K of RAM to legacy software. More modern software that supports the [[Standard_Memory_Expansions#Extended_1M-4M_Expansions_.28RAM7.2FYarek-style.29|extended 1M-4M standard]] will be able to access all the provided RAM.