MGD2 UTILITY V4.0 SUMMARY
(for both SRAM series or DRAM series)

Plese follow the flow chart and use the following supplementary
notes (Except for the process of reading file using the COPY
FILE function, all other process will respond to the
simultaneously pressing of "Select", "+", and "-" by restarting
the utility program (Reset).

(1) IC (Enter Cheat Code):  Enter codes to modify the game
    The 1st to 5th digits are the address of the ROM, the 6th to
    11th digits are the modification code, the 12th and 13th
    digits are the checksum for the 1st to 11th digits, the 14th
    digit is a 0 or 1 indicating modifying the program or save
    ram.
    - 14 digits in a code; the 14th digit can only be a 0 or 1.
      The 1st to 13th digits can be anything in the range of
      0-9 and A-F (i.e. hexadecimal).
    - the left side of the display shows current position of the
      code, in the range of 1-14.
    - the right side of the display shows the value at that
      position of the code.
    - press "+" to increase the value by one, press and hold for
      auto repeat.
    - press "-" to derease the value by one, press and hold for
      auto repeat.
    - press "Select" to go to the next position of the code
      until all 14 digits are entered; if there is an error in
      entering the code, "xx" is shown, otherwise "OK" is shown.
    - press "Select" + "-" to decrease the current position by
      one, press and hold for auto repeat.
    - press "Select" + "+" to increase the current position by
      one, press and hold for auto repeat.
    - when entering the 6th to 13th digits, press "+" + "-" to
      enter nothing for that digit (i.e. leave it at its
      original value); if either the 12th or 13th digit is not
      entered, the check sum will not be made; if the 6th to
      13th digits are all not entered, the original values of
      the address will be shown.
    - a 1 at the 14th digit indicates that the Save Ram in the
      DOCTOR I/O will be modified, this can be done only when
      the DOCTOR LINK is connected.  If the DOCTOR LINK is not
      connected, the display shows "LK" and it must be reset by
      pressing all three buttons.
    - a 0 at the 14th digit indicates that the modificatoin is
      performed on the program in the DOCTOR CARD.  This can be
      done with or without the DOCTOR LINK.  If done with the
      DOCTOR LINK, the power of the video game system must be
      turned on.
    You can use the FILE COPY function of this utility program
    to copy the game into the DOCTOR CARD, then hit all three
    buttons (i.e. RESET to "IC"), and enter the code.  You can
    then use the WRITE DISK function of FILE COPY (press "+"
    + "-" when entering NO.) to write the modified game into
    another disk with the same file name.  This way you can
    play the modified version of the game from the disk,
    instead of entering the code everytime.
    If a game is already in the DOCTOR CARD, you can modify it
    using the DOCTOR LINK (it cannot be done without it).
(2) FU (1.756M Byte i.e. 13.5M Bit disk format):  Follow the
    flow chart to perform.  This is very useful for new disks
    or disks which have error.  This format allows a disk to
    hold thirteen 1M game.
(3) FH (1.44M Byte i.e. 11M Bit disk format):  Follow the flow
    chart to perform.  This is very useful for new disks or
    disks which have error.  This format allows a disk to hold
    eleven 1M game.
(4) FL (720K Byte i.e. 5.5M Bit disk format):  Follow the flow
    chart to perform.  This is very useful for new disks or
    disks which have error.  This format allows a disk to hold
    five 1M game.
(5) DA (delete all data in a disk):  If your disk has error and
    you want delete all data on the disk for other use, this
    function allows you to delete the data within two seconds
    without the use of the format function.
(6) CD (Copy disk):  An 8M DOCTOR CARD must be inserted in the
    MGD2 for this function to work, or it can be connected via
    the DOCTOR LINK and the DOCTOR I/O with the video game
    system on.
    - for a 720K (2DD) disk copy, only one reading and one
      writing are required.  After a disk is written with "OK"
      shown, press "Select" and the display shows "C<", press
      "+" + "-" and the display shows "C>", you can then insert
      another disk for writing once more.
    - for a 11M or 13.5M disk copy, an 8M DOCTOR CARD requires
      to read and write twice.  A 16M or 32M DOCTOR CARD
      requires to read and write only once, and allows you to
      write a disk many times.
    - when reading or writing, the left display shows "C" and
      "D" while the right display shows a clock which turns
      clockwise when reading and counter-clockwise when writing.
(7) CF (Copy File):  A DOCTOR CARD is required to be inserted in
    the MGD2.  Similar to playing a game, you cannot use a
    DOCTOR CARD with a smaller capacity than the file you want to
    copy.  The best choice is an 8M DOCTOR CARD.
    - press "+" or "-" to choose the number representation of the
      file to be copied (If the file has been read successfully,
      you can press "+" + "-" and the display shows "C>", you can
      then insert another disk for copying).
    - press "Select" and the display shows "C<", signalling you
      to insert the source disk.
    - after the file is read, the display shows "C>", signalling
      you to insert another disk for copying the file read.
    - when finished, "OK" is displayed, and "EX" indicates an
      error occurred (Check the following chart for the meaning
      of X).
    - When a disk is being read or written, the left display
      shows "C" and "F" while the right display shows a clock
      rotating clockwise (read) or counter-clockwise (write).

MGD2 Error Representation:
E1:  Error in disk format
E2:  File not found
E3:  File length is incorrect
E4:  Error in disk (bad disk?)
E8:  Incorrect format in the index "MULTI-GD"
E10: Index "MULTI-GD" absent
E14: Disk full and new file cannot be held
E15: Disk space is not enough to hold new file
E1F: Error in Verification
