Matrix +3 frames (Compact 72 and System 200) are capable of using MTX-A8 and or MVX-A8 port cards for connections to panels, interfaces or direct connections.  Matrix +3 frames will support a combination of MTX-A8 and MVX-A8 or MVX-D8 port cards depending on the version of PGM-Win deployed.  These cards will not work in Micro-Matrix frame, a standalone port card is used in this series frame.
The differences between the card types are highlighted below:
MTX-A8 port cardOlder first version of M+3 analog port card, uses older software (will work with software version 2.1 or older, also higher revisions of software up to version 2.4.1).  This version of port card doesn't support Vox functions in PGM-Win software.  This card type was discontinued in 1999
MVX-A8 port cardcurrent version M+3 analog port card, uses current software, has VOX capability, will work with software versions 2.2 or higher. This has been the standard port card used used since 2000 until 2007 when the Matrix +3 product line was discontinued. 
MVX-D8 port cardcurrent version M+3 digital port card for connection to ICS - "T" adaptor panels, uses current software, has VOX capability, will work with software versions 2.2 or higher.  This has been the standard port card used since 2000 until 2007 when the Matrix +3 product line was discontinued.