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- MINIMOD - a subset modem program for MSDOS.
- ===========================================
-
- Dave Moore,
- QCOM Pty Ltd
- May 84.
-
- This program is copyright. (Yes, really - its in
- source!) Permission is granted to use it, but not for
- profit, provided that this notice is retained along
- with the start up message in the program itself, and
- provided that any modified versions of this program are
- returned to the public domain by submission to this
- system.
-
-
- The minimod program is a small modem program which should run on
- any MSDOS machine. So far, it has been run on an HP150 and a
- SHARP PC-5000 'Squirrel'. Providing your BIOS is competently
- written, and you have a serial port, it will run on your machine
- without any machine specific information beyond the name of your
- serial port driver.
-
- Before loading Minimod, you must configure your serial port for 8
- data bits, no parity. If you are intending to talk to an RCPM,
- you will want to set 300 baud. Otherwise, if you are
- communicating between local machines, start at 1200 baud and get
- your interface working, then try a greater baud rate. If you can
- not disable parity on your machine, you will not be able to
- transfer binary files using Christensen protocol. Minimod is able
- to transfer data in Hex to overcome this problem. (This code has
- not been tested as it hasn't proved neccessary.)
-
- Next, enter the command 'Minimod'. You should see the prompt
- 'Minimodem :'. If you get an error message and minimod aborts,
- check that the device name in AUXNAM is correct.
-
- All commands are 1 or two characters in length and are similar to
- the commands to be found in YAM. If a command requires a
- filename, you will be prompted for the file name after you have
- entered the command. Do not attempt to enter the file name on the
- same line as the command.
-
- The commands are:
-
- t - enter terminal mode. Use control E to get out.
-
- th - enter terminal mode. Echo characters typed on the
- keyboard on the screen. (like pressing the half
- duplex key on a terminal)
-
- Note that there is no file logging available.
-
- r - receive a file using Christensen protocol. Only the
- checksum form of Christensen is supported. Batch
- mode is not supported. You will be prompted for the
- file name for the data after you enter this command.
-
- s - send a file using Christensen protocol. You will be
- prompted for the file name after you enter the
- command. Always enter the receive command before you
- enter the send command, otherwise the computer doing
- the send may time out before you get the other end
- going.
-
- ph - Use hex for Christensen send and receive.
-
- pb - Set use binary for Christensen send and receive.
- (default)
-
- f - Transmit a file a if it was being typed in. This and
- the next command are discussed further below.
-
- fw - Transmit a file, but after each carriage return is
- sent, wait for a prompt character from the remote
- machine.
-
- pg - Set prompt character for use with fw command. The
- prompt character must be hard up against the g.
-
- pw - Set the time out time for waiting for characters
- from the remote terminal. PW2 is the default. The
- wait shoul be a decimal digit but the program will
- accept any character. If your Christensen send keeps
- timing out, put this value up.
-
- pc - Set the choke parameter. After each character is
- sent to the remote machine, the program counts
- down from the number entered (*1004) to zero. This
- enables you to slow down a fast machine when it is
- talking to a slow machine. The default is PC3. If
- you are dropping characters, put this value up. If
- you are sending large files in Christensen protocol
- at high baud rates (eg >300), set this to zero and
- see if it will work.
-
- ex - Return to MSDOS. You can also get back to MSDOS with
- Control C. Minimod does not currently set the line
- driver back the way it found it.
-
- Getting Minimod across to a new machine.
- ========================================
-
- If you have a machine with YAM or Minimod on it, getting the
- program across is easy. If you haven't, see the notes on booting
- Yam and MODEM7 for some ideas.
-
- To move it from a machine with Yam or Minimod to a new machine,
- connect the machines as described earlier. On the machine you are
- moving to type the command:
-
- CTTY \AUX ( or whatever your driver is called)
-
- This transfers control of your computer to the remote machine.
-
- Fire up Yam or minimod on the source machine and go into terminal
- mode with the 't' command. Press 'return' and you should get a
- prompt from the remote machine. You should now be able to enter
- commands to the target machine.
-
- Enter the command
-
- EDLIN MINIMOD.ASM
-
- You will get an asterisk in reply. Type 'I'. You should get the
- line:
- 1:*
-
- Now exit out of terminal mode with CTRL E and enter the following
- commands (not the stuff in brackets).
-
- PG* (set the wait character to asterisk)
- FW MINIMOD.ASM (transmit the file)
-
- The file will now be sent to the remote machine. This will be
- fairly slow. You can speed it up by setting PW0 and PC0. In
- particular, PW0 will speed things up, since after a tab character
- is sent, Minimod waits for blanks to stop coming back before
- continuing. This helps prevent garbling of characters, but may
- not be required by your equipment. If you find that characters
- are being lost, try increasing PW and/or PC.
-
- You can now assemble and link Minimod on the new machine by going
- back into terminal mode and entering
-
- MASM MINIMOD; (The semicolon is advisable)
- LINK MINIMOD; (Ditto)
-
- Now run the program, transfer MINIMOD again using christensen
- protocol, and compare the two files using
-
- FC MINIMOD.ASM MINIMOD.NEW (say)
-
- They should match to within a few nulls at the end of the file.
-
- Good luck. If you update the program, please put a version back
- on the system.
-
- Dave Moore,
- QCOM Pty Ltd,
- Brisbane 2293544
- 22 May 84