NEW MICROS, INC.
          1601 CHALK HILL RD.
          DALLAS, TX. 75212
          PH:  214  339-2204
          FAX: 214  339-1585


                    BUF34A  Motorola Buffalo Monitor
                         Modified by NMI  9/97


               The buffalo monitor is the eprom based monitor  supplied  on
          the  Motorola  68HC11  EVB development boards.   This version has
          been modified by NMI to provide the following enhancements:

               
               External I/O devices are disabled so that RAM can be placed
                    anywhere in the memory map.  The internal SCI is the
                    default I/O device.


          Getting Started:
               If you received the Buffalo monitor  as  a  Hex  file  or  S
          Record  on disk,   you will need to send one of these files to an
          Eprom programmer and program an 8K by 8  Eprom  (27C64  200ns  or
          faster).
               The  27C64  eprom containing the Buffalo monitor will be in-
          stalled in the memory socket located at addresses E000 to FFFF in
          the 68HC11 memory map.   On NMI boards this  is  the  right  most
          memory socket.  Verify the memory option straps on the board.
               For NMI F68HC11FN microcontrollers, the internal Rom contain-
          ing the Max Forth operating system must be disabled for the exter-
          nal  program  to operate.   To do this the Wipe35 program must be
          executed to reconfigure the 68HC11 for external  program  access.
          Mode straps are provided on NMI boards so that Bootstrap mode can
          be easily selected.  The Wipe program menu will explain the proce-
          dure for changing the configuration.
               After  the  Wipe35 program is completed,  a Reset applied to
          the board should generate the Buffalo prompt on the terminal.

          Operation notes:

                The buffalo provides an autostart vector to $B600 hex,  the
          beginning of internal EEPROM.   This feature is controlled by In-
          put Port E bit 0.   This port pin must be connected to ground via
          pull-down resistor or direct connection during RESET  for  normal
          buffalo operation.   If this pin is not connected,  random opera-
          tion of the Buffalo may occur during RESET.   If the pin is  con-
          nected  to  a  high  level,   the autostart vector is enabled and
          machine code must be in place at address location $B600 for  cor-
          rect operation of the MC68HC11.

                                          
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               Serial Port baud rate is 9600, 8 bits, one stop, no parity.

               Buffalo uses Ram locations $0036 to $00ff hex.  Do not
                     modify these ram locations in your code.

               I/O and Control Registers are located at $1000 - $103F hex.

               Type H at at the monitor prompt to get the help screen.


          Using the monitor:

               Basic  use  of the monitor will be to download an Motorola S
          Record of a program and execute the program using the monitor  as
          a  high  level  control  device.   Following is the basic flow of
          developement using the Buffalo Monitor:

               1. Develope program using Smallc or Assembly on the PC.
               2. Compile and assemble code to generate an S Record file.
                    ( Be careful where you orginate the program,  the
                     highest available address during buffalo operation is
                     $DFFF hex. Higher addresses will generate a load
                     error message)
               3. Send the S record to the board by using the Load T
                    command to downloading your file from the PC.  If you are
                    currently using MAXTERM just press [ALT+D] then enter the 
                    S19 file to be downloaded.
               
               4.  Execute your program using the buffalo Single Step,
                     Trace, BR, or Go commands.


          Good-luck.














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