Re: Transferring Disk Images Via Modem

[Rubywand <rubywand@swbell.net>]

Ryan Tremblay writes ...
> 
> I found an old 2400 baud modem.  I had some kind of cable I think it is a
> IIC+ to an Imagewriter I printer cable.  I connected it to the modem and
> using hyperterminal on the pc I put it on wait for a call I called my
> computer using the Apple Access II Program on the IIC+ which works fine.
> The only thing I can't get it to do is transfer files I can type and they
> will receive and send text fine can anyone help me?

     Kind of hard to tell what you are doing. An Imagewriter I (printer) cable
would not normally be used to connect to a modem because the signal lines are
switched around. To connect to a modem you need a modem cable.


> Can I connect the two
> modems together directly using the phone between the two modems like a
> direct cable connection using another program?
 ....

     You may be able to do that if your phone company does not interrupt with a
phone off-the-hook message.

     However, as Eduardo suggests, the best way to go is a direct connection
between computers with no modems involved. With a IIc+ and an IW-I cable you
have just about all the hardware you need for a direct connection to a PC COM
port which could do at least 9600 baud transfers.

     PC COM ports are usually male connectors. To connect a PC COM port with
the IIc+ modem serial port and an IW-I cable all you probably need is a
standard 25-25 or 25-9 female-female adaptor.


  ____________                                   ____________
 |    PC      |                                 | Apple IIc+ |
 |  running a |                                 |  running a |
 |  telecom   | <--[Fem-Fem]--><--IW-I cable--> |  telecom   |
 |  program   |    [adaptor]                    |  program   |
 |____________|                                 |____________|


     If it turns out that you do not have an IW-I cable, you can order one from
Radio Shack (Mac MD8 Male to DB25 Male Imagewriter I cable-- cable 950-0107).
These cables work for PC<-->IIc+ and PC<-->IIgs NULL modem connections.

     Another way of making a NULL modem connection is to use a modem cable from
each computer going to a NULL modem adaptor.


     Tests with Apple Access II running on a IIc+ show that it can be used for
NULL modem transfers at 9600 baud with a PC running Hyperterm. To do this,
create a new Hyperterm 'connection'-- call it something like "Apple9600" with
these settings:

o- Connection is "Direct to COM 1" (or "Direct to COM 2" if you connect your
cable to COM 2).

o- Port settings are 9600 baud, 8 data bits, no parity, 1 stop bit, ("8-N-1")
and Flow Control set to None or Xon/Xoff (i.e. not "Hardware").

o- Save the connection setup (or remember to save it before you exit Hyperterm)



On your IIc+ ...

     Start up Apple Access II and make sure the communications setup is like
the one used for Hyperterm-- 8 data bits, etc. and 9600 baud speed. Also, check
that communications Slot is set to "2".

     Make sure you have a ProDOS diskette with enough space to hold the file
you transfer. Jot down the volume name of the diskette-- say it's "FSAVE" and
stick it in another drive.

     Start Receive. Suppose you want to transfer a file named
NarfSoftware2001.shk to FSAVE. When asked to enter the name of the file, enter
/FSAVE/Narf2001.shk (the complete PC filename is too long for ProDOS).

Note: If you want to transfer the file to the same disk you use to run Apple
Access II, you can enter the file name without the volume name.

     When asked for file type, pick "other" and enter "BIN". (Actually, for an
.shk file, picking TXT is probably okay. "BIN" is a good general purpose
selection unless the file is actually supposed to be one of the types offered.)


On your PC (which has Hyperterm sitting there waiting) ...


o- In the "Transfer" menu, select "Send File".

o- In the "Send File" window, set "Protocol" to "Xmodem"

o- Click "Browse" and find the file you wand to send (i.e.
NarfSoftware2001.shk).

o- Click "Send".


     Your IIc+ has been waiting and, so, should begin to scroll stuff up on the
screen as it is sent. (It may be 20-30 seconds or so before you see anything on
the IIc+ screen.)

     Experiments sending a .shk file and a .dsk file worked out fine. The .shk
file unshrinked correctly using 8-bit ShrinkIt; and the .dsk file transferred
correctly to a DOS 3.3 INITed 5.25" diskette using DSK2FILE.


     The .dsk file transferred was ADT.DSK in Sean Gugler's new ADTw122
package. (See the article "Finally! ADT for Windows" in the GSWV Winter issue
at http://206.14.25.120/~cturley/a2zine/gswv/index.html for info and links to
get the package.)

(BTW, Apple Access II is a moderately primative telecom program. You might try
downloading and transferring Modem MGR so that you can do transfers using the
Z-modem protocol.)


     Another experiment was try a transfer using ADT. The newly created ADT
diskette was booted on the IIc+. "ADT122" was selected and speed set to 9600
baud.

     On the PC, Hyperterm was exited and the new adt.exe (included in the
ADTw122 package) was started under Windows. Speed was set to 9600 baud.

     Then, on the IIc+ (running ADT122), a .dsk file was transferred from the
PC to to an INITed diskette on the IIc+. No problem. (A transfer try at 19,200
baud snagged. That may relate to having a fairly long cable draped all over the
place-- a shorter cable might work at 19,200 baud.)



Rubywand