Lunter ED Host Access Opcodes
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Gerton Lunter's 'Z80' ZX Spectrum Emulator uses the ED F8 to ED FF opcodes
to access the host system

ED F8 NOP
      Ununsed

ED F9 BYTECOPY
      LD A,(DE) from normal memory
      LD (HL),A to SamRam memory
      INC E
      INC H

ED FA READMEM
      Load A with byte in SamRam at (HL)

ED FB WRITEMEM
      If PC<4000, store byte in A in SamRam at (HL)
      If PC>3FFF, multi-level loader, loads code to HL from last accessed
      .Z80 or .SLT file, or from a file name xxxxnnn.dat, where xxxx is the
      last snapshort filename, and nnn is the A register in decimal. If no
      file found, the user is prompted for a file.

ED FC READBYTE
      Reads byte from RS232 to A
      Z/CC=no byte waiting, NZ/CS=byte recieved

ED FD SENDBYTE
      Sends A to RS232

ED FE ROMPOKE
      LD (HL),A writing into ROM

ED FF QUIT
      Exits emulator