Path: news1.icaen!news.uiowa.edu!news1.chicago.iagnet.net!iagnet.net!newsfeed.internetmci.com!206.156.0.7!news2.jic.com!news From: Captive Dragon Newsgroups: comp.emulators.apple2 Subject: Re: //c problem Date: Tue, 18 Nov 1997 06:19:26 -0500 Organization: Dragons R Us Lines: 121 Message-ID: <347179BE.14CE@usa.net> References: <6056CDF6878F8879.ecurtis@isd.net> <347157c3.43961913@news.magna.com.au> Reply-To: llewysm@usa.net NNTP-Posting-Host: alex-va-n006c055.moon.jic.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.01Gold (Win95; I) Dave Morrison wrote: > > On Tue, 18 Nov 1997 04:22:00 GMT, Eric Curtis > wrote: > > > > >On 11-17-97 14:56 AVIAD OFFER Says: > > > >AO>Does any one know's how to connect the serial out put (modem) of > >AO>my //c to imb serial .. > >AO>I made my own cable but it didn't work ... > >AO>apple Ibm > >AO> 5 pin 25 pin > >AO>----------- ------------ > >AO> 1 1 > >AO> 2 2 > >AO> 3 3 > >AO> 4 4 > >AO> 5 5 > > > >AO>and it didn't work, What could be the problem. > >AO>I tryed to connect into com2 and send with communication program an > >AO>ascii file (with the in#2 command in apple //c). > >AO>not a signal ... nothing ! > >AO>HELP > > The correct pinouts are on Nathan Mates' site at: > > http://www.visi.com/~nathan/a2/ > > Cant tell you what the URL is under that as Im banned from the site > along with thousands of others. Good luck accessing. > > Someone I guess can post the pinouts for the ][c here if they have > access. > > Dave The full URL is http://www.visi.com/~nathan/a2/faq/pinouts.html For those who can't access the site, I've copied the following in full: //c (5-pin) serial port, null modem cable pinouts 5 1 4 2 3 The functions are: 1 Handshake Out (nominally DTR) 2 Data Out (TxD) 3 Ground 4 Data In (RxD) 5 Handshake In (nominally DSR) To wire up a IIc to a simple modem without hardware handshaking, use the following pinout: IIc Modem DIN-5 DB-25M 1 ----- 20 DTR 2 ----- 2 TxD 3 ----- 7 Gnd 4 ----- 3 RxD 5 ----- 6 DSR (you might want to use pin 8, DCD in some cases) The IIc cannot do hardware handshaking very well, but this is as close as you can get: IIc Modem DIN-5 DB-25M 1 ----- 4 RTS 2 ----- 2 TxD 3 ----- 7 Gnd 4 ----- 3 RxD 5 ----- 5 CTS The IIc's handshaking lines have annoying side effects, which cause problems with hardware handshaking: 1. The "Handshake Out" signal is implemented to mean "I want to send data" (the official and original meaning of RTS). If you turn off the output handshake line, the IIc will stop sending data. For a hardware handshaking modem, RTS is supposed to mean "You are allowed to send me data" (from the computer's point of view). If the computer tells the modem to stop transmitting, the computer will also be unable to transmit. This will reduce the rate at which data can be transferred bidirectionally, but doesn't cause any other problems. 2. The "Handshake In" signal is implemented to mean "There is receive data present" (the official meaning of DCD). If the incoming handshake line is disabled, the IIc will stop receiving data (ignore any data on RxD). For a hardware handshaking modem, CTS is supposed to mean "You are allowed to send me data" (from the modem's point of view). If the modem tells the computer to stop transmitting, the computer will also be unable to receive, and will discard any data sent by the modem while CTS is not active. This can cause screen corruption and loss of data blocks or acknowledgements during a file transfer, which will require retransmission. It is only likely to be a problem while a lot of data is being sent, so is more likely to cause problems during a file upload than a download. If the comms software is quick enough, it can drop RTS immediately when CTS is lowered, which will prevent the modem from sending any more data. You will need the //c System Utilities disk to set up the serial port speeds, or a comm program that overrides them anyway. Max speed is 9600. -- Marc Lewis Captive Dragon -=(UDIC)=- llewysm@usa.net captiva@geocities.com http://www.geocities.com/~captiva CROW: When you're out of slits, you're out of pier.