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-
- < File Subsystem Extra HELP >-------------------------------> 6
-
- The file subsystem permits you to move files between your
- system and this RBBS-PC. Downloading refers to moving files from
- this RBBS to your computer, and uploading is moving files from
- your computer to this RBBS.
-
- The transfer of data can either be done in ASCII or using a
- protocol referred to as XMODEM. The XMODEM protocol is
- common to CP/M based systems as was originally developed by
- Ward Christensen. The protocol is also contained in PC-TALK.III.
- More on this later.
-
- To list the names of the files that are available on the disks
- for downloading to your system, the <L>ist command should be
- entered at the Files Menu. The full names of the files will be
- listed along with a short description of each file. Usually
- there is a document file that accompanies most of the program
- items on the system. These document files usually have an
- extension of DOC or TXT.
-
- For those systems that have a master directory the <L>ist command
- will present a list of directories available and their contents.
- To list the names of the files that are available in a specific
- directory use L;XX, where XX is the directory suffix. These
- direcotry <>Lists can be stacked to reduce your responses.
- i.e. L;10;9;3 will list all files available in directory 10,
- 9 and 3.
-
- To list the names of the files that have been added since your
- last directory review simply enter N;XX, where XX is the
- desired directory to be searched. i.e. N;90 will display all
- new files added to directory 90 since your last directory
- review.
-
- ASCII DATA CAPTURE
-
- The transfer of files in ASCII mode can be done if your system
- is capable of data capture. To download a file using the ASCII
- method, follow the sequence of steps listed below.
-
- 1. List the files available for download using the
- L)ist command and either capture the list to your
- printer or write down the exact names of the files you
- want to receive.
-
- 2. After returning to the Files Menu, select D)ownload.
-
- 3. When RBBS-PC asks for the filename you wish to select,
- input the exact filename including a period between the
- filename and extension.
-
- 4. When RBBS-PC asks for the type of download you want, input
- A for A)scii method.
-
- 5. When the RBBS-PC tells you to open your capture file and
- enter a carriage return to start the download, you
- should do so. (Opening your capture file is done by
- using the Alt-R command in PC-TALK.) After setting up to
- receive the file on your end, you have to send RBBS-PC
- one carriage return so that it knows you are ready to
- start.
-
- 6. The file will be sent a line at a time until the
- entire file is sent. You will see the lines of ASCII
- code (readable text and numbers) on your screen as they
- flow to your system. If you wish to suspend the
- transmission temporarily, your system should send
- RBBS-PC a Ctrl-S (XOFF). A Ctrl-Q (XON) will restart
- the temporarily halted transfer. A Ctrl-X (ASCII CAN)
- can be sent anytime to abort the transmission of the
- data; because of the output buffering performed
- automatically by RBBS-PC, there may be up to 120
- characters transmitted before the output stops.
-
- 7. When the file transfer is finished, RBBS-PC will
- send you an End Of File Marker (Ctrl-Z) followed by 5
- bells. You should close your capture file (PC-TALK
- Alt-R) as soon as you hear the bells or you will get
- garbage at the bottom of the file. If you go away for a
- cup of coffee and end up getting the 'end of file' sign
- attached to the bottom of the capture file, you can
- delete it from the file later using a text editor.
-
- 8. After the file transfer is complete you will be
- returned to the File Menu. You should look at the
- capture file at this point to be sure you got it ok.
- (Use the PC-TALK Alt-V command to do this.) Do not list
- the entire file unless it is short; RBBS-PC will give
- you 3 minutes to remain off-line before it assumes you
- have left for the day and recycles, dropping you off
- line.
-
-
- XMODEM FILE TRANSFER
-
- If you have implemented XMODEM on your system, files with
- EXE, OBJ and COM extensions and tokenized BASIC files can be
- moved to your system. Files containing the IBM PC special ASCII
- characters (ones with ASCII values above 128) can also be
- transferred with XMODEM -- this includes Wordstar files. These
- files cannot be transferred in ASCII mode since ASCII transfer is
- only 7 bit and these types of files require the full 8 bit
- transfer of the data with no translation of the contents of the
- file.
-
- XMODEM also offers the advantage of a block check to assure
- that the data sent contains no errors. It does this by adding a
- checksum byte to the end of each block of data; the receiver
- calculates its own checksum and compares it to the one received.
- If an error is detected in the transmission, XMODEM will request
- that RBBS-PC retransmit the block of data.
-
- To perform an XMODEM file download, follow the instructions shown
- above for ASCII DATA CAPTURE, but select X)modem instead of
- A)scii when RBBS-PC asks what file download type you want (step
- 4 above). The XMODEM file transfer steps are as follows:
-
- 5. If you called in using EVEN parity the RBBS-PC will
- tell you to switch to NO parity and 8 data bits. If you
- called in using 8 data bits the system will not give you
- this message. You should then open your capture file
- (PC-TALK.III Alt-R command) and start the XMODEM receive
- process. PC-TALK.III starts XMODEM for you when you put
- '=X' at the end of the download filename (i.e. FILEN.EXT=X).
-
- 6. The file will be transferred automatically by XMODEM
- until the entire file has been transferred. You may
- abnormally abort the transfer by sending RBBS-PC an
- ASCII CAN code (Ctrl-X). PC-TALK.III will do this for
- you if you enter an Alt-R during the file transfer.
-
- 7. When the file transfer is finished, XMODEM automatically
- closes your capture file for you. XMODEM also ensures
- that no garbage gets into your file; binary files and
- text files are just as they were sent to you with 99.6%
- error free transmission. Wordstar files should transfer
- without extra hard carriage returns being added.
-
- 8. XMODEM transferred files cannot be listed on your
- monitor unless they are actually ASCII files. Binary
- files will appear as symbols rather than human readable
- text. You will have to test these files after you exit
- your communications program.
-
-
- FILE UPLOADING
-
- File uploading to the RBBS-PC is very similar to downloading.
- After you have downloaded a few files, you might want to send me
- one of your favorite programs or files just to test your ability
- to upload.
-
- Uploading of ASCII files can be done without interruption between
- lines. This system can handle data uploading at 300 baud without
- any problem. If the transfer is done at 1200 baud, however,
- there may be a data overrun if the file is over 20K. If the
- system falls behind during a file upload operation, it will
- send an XOFF (Ctrl-S) to your system. If your system supports
- XON/OFF file transfer speed-matching, data transmission will be
- suspended until an XON (Ctrl-Q) is sent to you, indicating
- RBBS-PC is ready to accept data again.
-
- When uploading files, please convert BASIC programs to ASCII
- before transferring them so callers without XMODEM can download
- them. To do this, use the file save command format listed below.
-
- SAVE"filename.ext",A
-
-
- Before sending me a file be sure I have enough disk space to take
- the file. When you ask for U)pload at the File menu, the system
- will tell you how much disk space is free on the upload drive.
- If this system runs out of disk space during an upload function,
- it will issue a cancel request. This will be in the form of a
- data stream of one or more ASCII CAN (Ctrl-X) characters. Your
- system will abort transmission if it supports XON/OFF file
- transfer speed-matching protocol. If your system does not support
- XON/OFF, the data overflow will be lost and the RBBS-PC will
- recycle, dropping you off line.
-
-
- UPLOAD GROUND RULES
-
- You are encouraged to donate programs to the library on this
- system. Any type of program or document is welcome, however,
- a few ground rules are in order. The files donated must contain
- only information that is in the public domain. No private
- or commercial information should be placed on this system. The
- SYSOP is not responsible for any of the data that is shared on
- this system.
-