The SA-1100 CPU (Empeg/RioCar) can have up to 128MBytes of DRAM per bank. The processor supports up to four banks, so the absolute hacker's limit on the Empeg/RioCar is 512MBytes of DRAM without adding any more external logic.

The practical limit appears to be 48MB, but it may be possible to install 16MB chips in place of the current 8MB chips, which would give a practical limit of 96MB.

Cheers