Newsgroups: comp.sys.apple2.comm Path: news.uiowa.edu!hobbes.physics.uiowa.edu!math.ohio-state.edu!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!waikato!comp.vuw.ac.nz!actrix.gen.nz!dempson From: dempson@atlantis.actrix.gen.nz (David Empson) Subject: Re: modem and IIgs question Message-ID: Sender: news@actrix.gen.nz (News Administrator) Organization: Actrix - Internet Services Date: Sat, 12 Aug 1995 06:48:39 GMT References: <40dt50$qg7@eplet.mira.net.au> X-Nntp-Posting-Host: atlantis.actrix.gen.nz Lines: 41 In article <40dt50$qg7@eplet.mira.net.au>, Tony Hunt wrote: > > Would you be able to either post this information or send me the file > also as I too would like to use a 28.8k modem with a //GS but would > rather build the cable than try to find one. Here is the pinout of the hardware handshake cable. IIgs pinout (Mini-Din-8): looking at the back of the plug, or the socket in the IIgs: 8 7 6 5 4 3 2 1 IIgs Modem Mini-Din-8 D25M Function 1 HshkOut 4,20 RTS and DTR 2 HshkIn 5 CTS 3 TxD- 2 TxD 4 Ground 7 Ground 5 RxD- 3 RxD 6 TxD+ (not connected at modem) 7 DCD 8 DCD 8 RxD+ (connect to ground, i.e. pin 4 at IIgs or pin 7 at modem) Most modems use a D25 connector. Pocket modems may use a D9 (9-pin) connector. I'm not sure what pinout this connector uses. The DTR connection (pin 20) is optional. It allows the modem to be used in non-handshaking mode with the IIgs output signal going to DTR, allowing it to be used to hang up (AT&D2). If using hardware handshaking, you must include &D0 in the initialization string, to ensure that the DTR input will be ignored. -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand