http://problemkaputt.de/zxdocs.htm

Other
  xx9F ........             Multiface I In
  xx1F ........             Multiface I Out
  xxBF ........             Multiface 128 In
  xx9F ........             Multiface 128 In v2 (Disciple) (uh/what?)
  xx3F ........             Multiface 128 Out
  xx3F ........             Multiface III Button
  xx3F ........             Multiface III In
  xxBF ........             Multiface III Out
  7F3F                      Multiface III P7FFD (uh?)
  1F3F                      Multiface III P1FFD (uh?)
  FF3F                      British Micro Grafpad Pen up/


http://www.worldofspectrum.org/faq/reference/ports.htm





http://mdfs.net/Docs/Comp/Spectrum/Hardware/Garner.htm
To page the MF RAM in or out, read from the specified ports below, for example using IN A,(xx) in machine code (use IN to page both in and out...). To re-enable the stop button for normal operation, OUT to the port (eg OUT (xx),A). The Multiface 3 has less space than the others for usable RAM, as you can see.
0-8191 - rom multiface
8192-16383 ram multiface


mapear multiface: leer puerto 9f (en multiface 1). desmapear: hacer out a puerto 1f

pulsar nmi: mapea toda multiface y salta a 66h?
