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#### 7.1.6 C64 I/O extension settings

I/O extensions are (usually) cartridges which do not map into ROM space, but use only the I/O space at address range $DE00 … $DEFF and/or $DF00 … $DFFF.

Please use these extensions only when needed, as they might cause compatibility problems.

The following I/O extensions are available:

- ACIA (Swiftlink, Turbo232)
- DigiMAX
- DS12C887 RTC
- Ethernet (The Final Ethernet, RR-Net)
- GEO-RAM
- MIDI (Passport, Datel, Maplin, Namesoft, Sequential)
- REU - The “RAM Expansion Module” extension emulates a standard Commodore RAM Expansion Unit; this can be used with GEOS and other programs that are designed to take advantage of it. This currently works only in the C64 emulator.
- SFX Sound Expander
- SFX Sound Sampler