CP/M/CPM_CDROM.iso/simtel/cpmug/cpmug079.ark/MODEM7.DOC

Text File | 1984-04-29 | 15.1 KB | 328 lines

              CP/M MODEM PROGRAM DOCUMENTATION
        by Mark M. Zeiger and James K. Mills
              11/04/80

This  program  uses  the  file transfer routines  written  by  Ward
Christensen  in his CP/M file transfer program (V2.0 as of  8/6/79)
and  is  compatable with his program in single file transfer  mode.
Multi-file transfers are only possible between two systems  running
the program described below.

This program has three functions:

        1.  Communication
        2.  Program transfer
        3.  Modem control (for PMMI Modem)


COMMUNICATIONS

The program may emulate a terminal or echo data back to sender (act
as a computer).

Terminal Mode  -  'T' Option

        The  terminal mode may be called with or without a file  name.
        If  a  file  is  specified (it should be  a  new  file),  then
        anything  received  by the modem may be saved  in  memory  and
        later  written on disk.  The save feature is toggled ON/OFF by
        Control-Y.  On  an IMSAI the front panel LEDs  will  indicated
        that  memory save is toggled on by showing the binary value of
        the ASCII character received. For those with no front panel, a
        colon  (:) will be printed at the beginning of each line  when
        memory save is active.  The colon will not be transmitted over
        the modem nor will it be saved in memory.

        If  a  file  is not specified,  then memory save  can  not  be
        activated.

        If  the memory buffer is full (the buffer is from the  top  of
        the  program  to  the  bottom  of  BDOS),   the  contents  are
        automatically  written  to  disk  (but the  file  is  not  yet
        closed).  Communications  may  then continue with  the  buffer
        reinitialized.  The  computer with which you are communicating
        must  accept  the  X-ON and X-OFF  (Control-Q  and  Control-S)
        conventions or data will be lost.

        When  communications are over,  use Control-E to exit from the
        Terminal  mode and enter the Menu.  The file to which you  are
        writing  must then be closed by using the  'WRT'  command.  If
        this  is  not done,  all data will be lost.  I decided not  to
        close  the file automatically since there will be  times  when
        you leave terminal mode and then decide to re-enter.  This may
        be done while in the Menu by using the 'RET' command.  You may
        re-enter Terminal mode and save in the same file as many times
        as  you wish as long as you have not closed the file with  the
        'WRT' command.

        While  in  Terminal  mode,  Control-T will  put  you  in  File
        Transfer mode.  This will allow you to send the contents of an
        ASCII file over the modem. This routine does no error checking
        and  there are no protocols specified between this program and
        the  receiving computer other than that it should be ready  to
        receive  data  via  the  modem.   Control-X  will  cancel  the
        transfer.


Computer mode - 'E' Option

        This  mode  echos data received by other  computer.  Only  one
        computer  may be in this mode at one time.  There is  no  save
        feature  in this mode.  Useful if you wish to communicate with
        somebody running the terminal portion of the program.

File transfer - 'S' and 'R' Options

        These  features  are  the same as in the  CP/M  Modem  program
        written by Ward Christensen except that upon completion of the
        transfer, control returns to the Menu unless the secondary 'T'
        option has been selected.  In the latter case, control returns
        to Terminal mode.  Remember that if you are operating a remote
        computer   using   a  timesharing  program   (such   as   Ward
        Christensen's "BYE"),  the remote should be instructed to send
        or  receive  in  the  quiet (Q) mode as  a  secondary  option.
        Examples  of  commands for sending and  receiving  are  listed
        below.

Multi-file transfers

        Using  the B (batch) secondary option,  more than one file and
        ambiguous filenames may be transferred. To send files, use the
        primary  option  "S" and the secondary option "B" (along  with
        any  other  secondary options and baudrate).  To  receive  the
        files  being  sent,  use the "R" primary option  and  the  "B"
        secondary  option.  Files may not be named since filenames are
        sent by the sending program, but a disk drive may be specified
        (or else the files are written to the default drive).

Backup option

        There  is  a byte at the beginning of the program (106H)  that
        will  create a backup file if a file on the disk has the  same
        name  as the file being received in multi-file  transfer  (see
        MODEM.SET). If this byte is set to 0FFH, a backup file will be
        created.  If  it is zero the file on the disk will be  deleted
        before the new file is received. If you are running CP/M 2 and
        a file on the disk is designated R/O or SYS,  a backup will be
        created whether the byte at 106H is set or not.

        Be  careful - if you are running CP/M 1 and the drive on which
        you  are receiving has an R/O file with the same name  created
        by CP/M 2,  the R/O file can not be accessed (found,  changed,
        erased,  etc.)  by CP/M 1.  You will therefore have two  files
        with  the same name when you are running CP/M 2.  To fix  this
        problem, use CP/M 1 to change the name of the file that is not
        R/O. Then use CP/M 2 to do what you want with the R/O file.

        Examples:

        The  sender enters    SBOT.600 B:*.COM    to send all the  COM
        files on disk B.  Also specified were originate mode 600  baud
        (PMMI modem) and return to terminal mode when done.

        The  receiver enters     RBA.600    to receive all  the  files
        being  sent on the default drive (also answer mode at 600 baud
        for PMMI).


        The sender enters the command   SB.600  ASM.COM  *.HEX  B:M*.*
        which  will send ASM.COM from the default drive,  all the  HEX
        files from the default drive,  and all the files starting with
        "M" from the B drive.  [note that neither 'A' or 'O' were
    specified: default is to whatever mode the PMMI is in
    currently]

        Multifile transfers may only be done from the menu. It may not
        be specified when the MODEM program is called.  In other words
        A>MODEM  SAB  *.COM   will result in an INVALID  OPTION  error
        message.


Return to Menu - 'M' option

        When asked to select an option, 'M' returns to Menu.

The MENU

        If  the Modem program is entered with no option,  the Menu  is
        called.  The  Menu gives the choice of selecting the  standard
        options as defined by Ward Christensen (T,  E,  R, and S). The
        Terminal  mode has been greatly expanded as  described  above.
        The "R" and "S" commands must be called with a filename or you
        will be required to enter the primary command (S or R) and the
        filename  again (but NOT the secondary options).  If you  want
        multi-file  transfers,  then  the "R" option does not  need  a
        filename.

  RET - You may also enter terminal mode using the 'RET' command,  but
        no  data  will  be saved since a file may not  be  named  with
        'RET'.  Use  the 'RET' command to RE-ENTER Terminal mode after
        it  has  first been entered with the 'T' option.  If  this  is
        done, you will still be able to save the communications if you
        were doing so before you exitted the terminal mode.

  WRT - The  'WRT' command must be used after leaving  Terminal  mode.
        This  writes  the  last buffer to disk and  closes  the  file.
        Failure  to use the 'WRT' command results in loss of all  data
        and a file of length zero.

  DEL - The  'DEL'  command  erases the most recent file  accessed  in
        Terminal mode.  Useful if you decide after communications that
        you don't want to save information just gathered.

  CPM - The 'CPM' command reboots and returns to CP/M.

  XPR - The  'XPR'  command is a toggle which causes the  menu  to  be
        printed  or not printed.  Initially the menu is on unless  the
        program is called with the "X" option (ie.  A>MODEM X ).

  DIR - The 'DIR' command lists the directory of a CP/M disk.  A drive
        may  be specified (ie.  DIR B:) or the default drive  will  be
        listed.  After  the directory is listed,  the menu will not be
        printed whether XPR mode is on or off.  If XPR mode is on  and
        you wish to see the menu, hit return.

FOR THE PMMI MODEM

  DSC - To disconnect you must use the 'DSC' command in the Menu.

        The original secondary options for the PMMI Modem (as  defined
        by  Ward  Christensen) are "A" (answer mode),  "O"  (originate
        mode), and baudrate selection. See examples below.

        Once  answer  or originate and a baudrate have  been  selected
        (ie.  SO.450  NAME.TYP),  any subsequent options will use  the
        same mode and buadrate. If you want to change the baudrate, it
        may be done without changing the mode.  For instance,  if  you
        are  in  originate mode at 450 baud,  then the command  'R.600
        NAME.TYP'  will  allow you to receive a file at  600  baud  in
        ORIGINATE mode.  If you want to change the ans/orig mode, then
        you MUST select the baudrate again or it will default to 300.


  CAL - Allows  dialing  of number.  If a connection to a computer  is
        established,  you  will  be able to  select  options  (usually
        TO.xxx).   If no connection is made after 15 seconds, [changed
    to  25  seconds  in  distributed  version]     then  you  will
        be  informed and be given the option of redialing or returning
        to the menu.  The dial routine may also be specified when  the
        Modem  program is called by entering  A>MODEM C.  No secondary
        options will be accepted when the "C" option is used.   [Note:
    you cannot type:  CAL 312-545-8086  --  well, you can, but the
    number will be ignored and you will have to retype it when the
    program asks for it   --   in  the  latest  version  (11/4/80)
    there is a 'library' feature such as in DIAL.ASM.   To use the
    CAL function, type CAL and a return at the menu.  You will see
    a message   'WAITING FOR DIAL TONE'  then a lot of stuff about
    entering the number.   At this point you may type in a number,
    or  you  may  type  a  letter  which will designate one of the
    library numbers (which you must insert at assembly time).

  ^B -  Control-B  while  in Terminal (or Echo) mode allows change  of
        baudrate "on-the-fly." A carriage return gives 300  baud;  all
        other rates (110-600) must be explicitely stated.


LISTING OF COMMANDS AND OPTIONS

    Primary options

        S - send a CP/M file (must specify file/s)
        R - receive  a CP/M file (must name file unless B sec opt used)
        T - terminal mode (specify file if memory save wanted)
        E - terminal mode with echo
        M - return to menu
        X - used only when program is called to initially
            toggle menu off

    Secondary options

        B - multi-file mode for sending and receiving files
        T - return to terminal mode after transfer (memory save off)
        R - view what is received in file transfer
        S - view what is being sent in file transfer
        V - view what is being sent or received in file transfer
        T - Terminal mode (used with remotely controlled computer)
        O - originate mode (PMMI modem)
        A - answer mode (PMMI modem)
        .xxx - baud rate xxx (xxx = 110-600  PMMI modem)

EXAMPLES        (fn = filename,  ft = filetype)

        Send file, originate mode, 300 baud

                                   SO fn.ft

        Send another file, same mode and baudrate

                                   S fn.ft

        Receive  file on B drive,  600 baud,  ans mode,  view what  is
        being received, return to terminal mode

                               RART.600 B:fn.ft

        Send all COM files, no messages on console, same baud and mode
        as last transfer

                                  SBQ *.COM

        Send two files from two different drives

                           SB A:fn1.ft1  B:fn2.ft2

        Receive files being sent by above on drive A (baudrate must be
        same and modes opposite)

                                    RB A:

        Terminal mode,  save communication in file,  300 baud (default
        rate),  originate mode (in terminal must type CTRL-Y to  start
        save, in menu must type "WRT" to close file)

                                   TO fn.ft


ASSEMBLING THE PROGRAM

        You  must use Digital Researches' MAC to assemble the program.
        The  files required are MODEM.ASM and  MODEM.LIB.   MACROS.LIB
        does not actually contain any macros in the true sense, but it
        does  contain  routines  that are necessary for the program to
    run (MFACCESS however does use nested macros as real macros).

        If you have a PMMI and an IMSAI,  you may assemble the file as
        is.  If  you do not have an IMSAI with a front  panel,  change
        IMSAIBYTE  to 'FALSE' (near the beginning of the program).  If
        you  wish another character instead of the colon  to  indicate
        when  memory  save  is active,  change "MVI A,':'  "  to  "MVI
        A,'char'  " in the "TERM" routine where 'char' is the printing
        character  you would like at the beginning of each  line  when
        memory save is active.

        If you do not have a PMMI,  change the byte to 'FALSE' and put
        your  modem status and data ports in the appropriate  equates.
        The  labels  'MODRCVR'  and 'MODSNDR' should be  the  same  as
        MODRCVB  and  MODSNDB  (the  bits tested) if  your  UART  uses
        positive  logic  (JZ)  and should be zero if  your  UART  uses
        negative  logic.  If you have a Z-80 (or maybe a  fast  8085),
        change  the  'FASTCLK' byte to 'TRUE'.  If any port  or  modem
        initialization must be done, put the initialization routine in
        the  area  labeled INITMOD (replacing the PMMI  initialization
        routine). See MODEM.SET for more details.

        If  you  have  a D.C.  Hayes Modem,  you may  incorporate  the
        routines from MODEM.ASM V2.0 (as of 8/6/79).

        You  should also note the comment in the INBUFF  routine  near
        the end of the program.

        Any problems or bugs, please call me:

                Or latest revisor:
        Mark M. Zeiger        James K. Mills
        198-01B 67th Ave.    824 Jordan Place
        Flushing, N.Y. 11365    Rockford, IL  61108
        [phone]        [phone]