Rick_McCormack@mindlink.UUCP (Rick McCormack) (02/23/91)
In an article Jeffrey Baron <jbaron@silver.ucs.indiana.edu> asks about: > I have here a laptop IBM with a 9 pin AT serial port. > > I also have here a Mac Plus. Between the two I have a din8 > to 9pin printer cable. I have a Null modem adapter (Radio > Shack) tossed into the line. On the IBM end, I have Procomm > or Bitcom. On the Mac end, I have Microphone or Red Ryder. > Everyone agrees that the Null modem will simulate a modem > between the two machines, and I have done the following: > > On bitcom, ignore DSR (ignore the fact that Ma Bell isn't > there). In fact, I have tried every combination of line > settings I could find on the four different programs. > > Take two modems (one 1200, one 2400), connect with a phone > line. On a Mac 512ke, do a 9pin seriel to 9pin seriel (mind > you, when I put the Null modem adaptor anywhere near the > 512ke, the machine was reduced to a paperweight with asthma- > it went totally dead, and made a noise like a leaky air > hose. It was ok once I removed the adaptor, though). > > On all these cases and more, the two failed to recognize the > other's existance. I've had speculation before, and I thank > all those who offer it. What I want now is experience. > Somebody has used this configuration, and knows what one can > do with the aforementioned resources. I routinely connect my pc-clone to a Mac plus set up in the same room. The Mac has a 2400 bps external, and the pc a 1200 baud internal. I use Procomm on the pc and Red Ryder on the Mac. Both modems are connected to a Y-adaptor that enables either one to use my telephone line. I pull this adaptor out of the wall, and the two computer modems are effectively joined thru the modems, without any possibility of talking to the outside world. Like this: |PC|-|modem|----|Y-Adapt|---|Modem|--|Mac| Start both computer comms programs. I use ATHA on the PC, then ATH on the Mac, but either one can Answer or originate. The main things to change are the echo and duplex setups, and I tackle them once the connection is made. (I use the pc on a few special boards and its settings may vary from the 8N1-Full settings of the Mac by quite a bit.) I have used this setup several times to transfer files of 10s of Ks, at 1200 bps between the machines. Not the fastest, but it is consistent, reliable and cheap, and I don't need anything else to do it everytime. I hope this helps: the main thing is to set one comm program to answer mode when it goes on-line with the ATHA, and then, within the carrier detect time to get the other computer on-line in the originate mode with ATH. PS I did run into one modem that required the sequence ATH1A rather than ATHA. ______________________________________________________________ | Rick McCormack | IMAGISTICS BUSINESS THEATRE TECHNOLOGY | | Vancouver, BC | Information transfer - with a purpose. | | CANADA | ________________________________________ | | AOL: Rique | INTERACTIVE COMPREHENSIVE ENLIGHTENING | |________________|____________________________________________|
reeves-bill@CS.YALE.EDU (Bill Reeves) (02/24/91)
Hi. A friend just bought a small Tandy laptop word processor (a 200, I think, but maybe something as high as a 250 (?)), and he needs a way to transfer files to his ancient Mac 512K. We tried several public domain terminal emulator programs (Red Ryder 9.2, Term Emulator) and hooked the Tandy up to the Mac through the modem port, but we couldn't get the Mac to accept the characters the Tandy was sending. The people at Radio Shack have not been very helpful/knowledgeable - they say we need a program called Mac Terminal or something. So... Is what we are attempting possible? Do we need more software, or more hardware? (The Tandy has an RSC232 port (or whatever they're called), the Mac's modem port is the old 8- or 9-pin thing, and my friend went all over town getting cables to connect the two machines) Can anyone help? All responses will be greatly appreciated! Thanks a lot! -- Bill Reeves, reeves-bill @ cs.yale.edu
jbaron@silver.ucs.indiana.edu (Jeffrey Baron) (02/24/91)
I have a much simpler question: I have here a laptop IBM with a 9 pin AT serial port. I also have here a Mac Plus. Between the two I have a din8 to 9pin printer cable. I have a Null modem adapter (Radio Shack) tossed into the line. On the IBM end, I have Procomm or Bitcom. On the Mac end, I have Microphone or Red Ryder. Everyone agrees that the Null modem will simulate a modem between the two machines, and I have done the following: On bitcom, ignore DSR (ignore the fact that Ma Bell isn't there). In fact, I have tried every combination of line settings I could find on the four different programs. Take two modems (one 1200, one 2400), connect with a phone line. On a Mac 512ke, do a 9pin seriel to 9pin seriel (mind you, when I put the Null modem adaptor anywhere near the 512ke, the machine was reduced to a paperweight with asthma- it went totally dead, and made a noise like a leaky air hose. It was ok once I removed the adaptor, though). On all these cases and more, the two failed to recognize the other's existance. I've had speculation before, and I thank all those who offer it. What I want now is experience. Somebody has used this configuration, and knows what one can do with the aforementioned resources. I do not have the money to buy Mac Link for $169. I call this a last resort. However, if everyone agrees that it can be done, would someone please tell me how to do it without something as expensive as a TOPS network or buying a new Mac? Or has everyone else won the lottery and upgraded to newer macs and I simply missed the January 24 deadline...? Incidentally, I am more looking for 512ke<->IBM AT than Plus<->AT. I only include the plus because I have access to a plus for the time being, and because somebody mentioned the idea that a plus<->IW II cable is a null modem cable. And yes, I have tried it with and without the null modem adaptor. Thank you to whoever can solve this dilemma. I'm sure I speak for a lot of readers who have suffered through a lot of silent misery. (.X.) Jeffrey Baron -__- jbaron@silver.ucs.indiana.edu