CP/M/CPM_CDROM.iso/simtel/sigm/vols000/vol065/bye.doc

Text File | 1984-04-29 | 11.1 KB | 241 lines

NOTE:    The major enhancement of version 6.7 of BYE is that a single
    source file now contains conditional assemblies to control
    either PMMI or D C Hayes modem cards.  Otherwise, this doc-
    umentation is essentially the same as that for version 6.3,
    with the addition of some minor fixes and improvements.


                BYE67.ASM DOCUMENTATION



    The BYE program for PMMI and D C Hayes modems has undergone three
significant revisions in recent months, and many features and options
have been added.  This documentation is intended as a guide for sorting
through the many additional items.
    Most of the new features have been added via conditional assembly,
thereby allowing the program to accomodate users with varying memory re-
quirements.
    Note that not all combinations of conditional assembly have been
tested, so be careful!




              DOCUMENTATION OF REVISION 6
              ===========================

The following features have been added to revision 6:

1) Timed logout-  This feature allows your system to disconnect
   after a pre-specified time when there is no input from the remote
   user.
    ==> Set "TIMEOUT" to "true".
    ==> Set "TOVALUE" to the number of minutes to wait before
        disconnecting.

   This feature requires that timing now be done in software, instead of
   using the PMMI timing circuitry, which is tied up with baud rate gen-
   eration when the system is in use.  Therefore, you must set the equate
   "FASTCLK" to true if you are running a 4mhz system, and to false if
   you are using 2Mhz.    You must do this even if you don't use the timed
   logout feature.

2) Autoload- Setting "COMFILE" to true causes the bye program to auto-
   matically load and execute a machine language program from the disk.
   This is useful for remote bulletin-board systems, remote query and
   data entry, etc.  If you are using cp/m 2.x (equate "CPM2" set true),
   you must specify which user number to load this file from.  This is
   done by setting the equate "COMUSR".  Note that this user number will
   also be the one under which the autoload program is executed.

   The loaded program can prevent the remote user from re-booting the
   system by changing the byte at 0 (jmp instruction) to a call.  When
   this is done, the system will trap control-c from the remote user
   (changing the character to a null), and a branch to location 0 (warm-
   boot) will terminate the session, as if "bye" had been typed by the
   user at cp/m command level.    This allows the autoload program to end
   the session by merely branching to location 0.

   If it is necessary to give the user full control of cp/m, the auto-
   load program must replace the call at zero with a jump.  In this case,
   control-c will no longer be trapped, and "jmp 0" will warm-boot the
   system.

   NOTE:  The system operator can answer an incoming phone call in
      either of two ways:

        A>BYE /C    ;this form causes the bye program to answer the
             phone, prompt the user for nulls, then load
             and run the autoload program.

        A>BYE /A    ;this form causes the program to answer the
             phone, then boot to cp/m command level.

     Note that either method will, upon termination of the session,
     re-load the autoload program before accepting another call.

3)  User and drive number verification- The bye program will now
    validate the logged-in drive, and, if it exceeds the value set
    by the equate, "MAX$DRIVE", the system will reset the logged-in
    drive to 0 and perform a warm-boot.

    If you are using cp/m 2.x ("CPM2" equate set to true), the same
    verification will be done for the logged-in user number.  The
    equate in this case is the variable "MAX$USER", which should be
    set to 0 for cpm 1.x.

4)  Special function keys- You can assign any three key-codes on the local
    keyboard for the following special functions (Note that you should also
    select the DUAL$IO mode along with these options):

    "TWITKEY"  - This key immediately logs out a user.  This can
             be useful to remove system crashers, "explorers",
             etc. from the system.

    "MSGKEY"   - This key prints the message: "MESSAGE FROM OPERATOR:",
                     which can be used to announce operator presence, prior
                     to typing a message to the remote user.

    "SYSDKEY"  - This key prints the message: "SYSTEM DOWN IN 5
                     MINUTES", which is handy when you want to drop a hint
                     to a caller who has worn out his welcome.  (or just
                     when you want to politely get the system back for
                     yourself).

    Note that the conditional assembly for these keys is set by the
    equate "FKEYS".  The key-codes can be individually changed.

5)  Decimal user logs - If you use the USRLOG functions (see revision 5
    section of this documentation file), setting the "DECIMAL" equate to
    true provides a decimal printout of the user log values, instead of the
    default hexadecimal printout.

6)  Lower case checking - By setting the "CK$LWC" equate to true, the user
    will be asked at sign-on if his terminal can display lower case.  If
    the user responds with "N", all output will be converted to upper case
    before transmission.

7)  If you have an IMSAI (or any computer with an input port set by
    switches), setting the "IMSAI" equate to true provides the following
    capablities:

    switch       function
      0        turns on the hardcopy log ... this echoes remote
            input (not output!) onto the printer.  This provides
            a hardcopy logging function with minimal amount
            of printout..i.e., only the users' input is echoed.

      1        sets up "password mode"...when this switch is up, any-
            one trying to log onto the system must provide a pass-
            word.  This allows you to reserve the system at times
            for special callers.  Note that the "PWRQD" equate
            must be set to true for this key to have any affect.

      2        blacks out the remote user...this is useful when
            you need to enter a password into the machine that
            you'd rather the remote user not see. Characters
            echo onto the local terminal, but are not sent to
            the remote user. Note that the equate "DUAL$IO", which
            allows the local terminal to be functional, must be
            set to true for this key to have any effect.

      3        enables the FKEY's, when the "FKEY" equate is set to
            true.  Using this switch, the special function keys
            can be used normally when the switch is off, and
            as function keys when the switch is up.

   Also: the user log (if USRLOG is set to true) will be displayed
   on the front panel LED display.

   The port address of the front panel I/O port can be changed using the
   "SENSE" equate.  It is initially set up for the IMSAI addressing, which
   is port 0FFH.

8) The console status routine now checks the overrun and framing error
   bits of the PMMI modem chip, and if either of these bits is set, the
   character in the modem is cleared.  Thanks to Bruce Ratoff who used
   this idea in his DC Hayes version of the bye program.

9) Since the WELCOME file may reside on a different user number than the
   autoload program (if any), the WELUSR equate has been added to indicate
   the user number under which WELCOME may be found.  Note that if the
   COMFILE option is not also used, the caller will receive control of the
   system under user number WELUSR.

Credits: (version 6.3)

Dave Hardy, who implemented the special function keys, and IMSAI functions
for the Technical CBBS, Dearborn, Mich (313-846-6127 24Hr).

Bruce Ratoff, who provided a lot of this stuff in his DCHBYE54, which I
lifted and added to the PMMI version.

Keith Petersen, who provided the ideas and suggestions.

                   ====>Ron Fowler
                    Sept 24, 1980

Credits: (version 6.7)

Dave Kozinn, who had the time and patience to merge the D C Hayes code
into PMMIBY63, creating (at long last) an "universal" BYE.

                   ====>Bruce Ratoff
                    Feb 17, 1981


           DOCUMENTATION OF REVISION 5
           ===========================
        PMMIBYE5.DOC    (as of 7/20/80)

    The PMMIBYE5.ASM program is out for distribution, but it has not been
thoroughly tested in all of the possible modes of operation.
    (Please note that version 5.4 is substantially longer than previous
PMMIBYE versions.  Because of the great number of conditional switches, the
program could require as many as 1060 bytes of RAM, or it could be smaller
than the 900 bytes used by the original PMMIBYE.  It all depends on the way
you set it up.)

   Basically, several new conditional assembly routines have been added to
allow user selection at time of assembly of the following:
     1. Password access
     2. User log (counts number of system callers)
     3. Memory-mapped console I/O
   Also added to V5.4:
     1. 710 Baud option for PMMI modem
     2. Modifications to AUTO-ANSWER routines
     3. "/R" option to allow reset of user log counters

   Password access was made conditional to allow use with systems that offer
unrestricted access.
   The user log was added to allow the system operators to keep track of the
number of people who called the system.  In addition, it can also count the
number of unsuccessful log-ons (i.e. didn't know password) and the number of
voice calls, and conditionally display both numbers on the system console
when the program is exited with a control-C from the system console.  The
counters can be initialized with the "/R" option to all zeroes, or preset by
using DDT, or SID.  The number of successful log-ons is also conditionally
output to port 255 (0FFH) for display on the computer's front panel.
   The memory-mapped I/O conditionals have been added to allow use of the
serial I/O port on the Morrow's 2D controller board as the system console;
however, the routines can be used with any memory-mapped system.
   The 710 Baud option was added for "short-haul" callers, and because
operation at 710 Baud with the PMMI modem is "iffy" at best, it will
probably be of very little use.
   The AUTO-ANSWER routines were modified to allow more dependable ringback
operation.  Unfortunately, the ringing signal at the caller's end of the
phone line does not always correspond exactly with the ringing signal at the
system's end.  Although a system-end ring does occur sometime during the
caller's ring cycle (ring-no ring), it is possible for the system to receive
no or 2 rings in the time that the caller thinks just one ring has occurred
(The DIAL program is notorious for this).  The solution chosen for this
problem was to check for one or two rings before call-back.  This would
allow for the "phase" difference of the caller-system ring signals.  This
solution also means that the phone must ring at least three times before the
system will assume that the call is voice, and is not to be answered.  The
advantage of this arrangement is that it is virtually impossible for the
computer to "miss" a call that is intended for it.

            Dave Hardy