Newsgroups: comp.sys.apple2.comm Path: blue.weeg.uiowa.edu!news.uiowa.edu!uunet!news.mathworks.com!newshost.marcam.com!charnel.ecst.csuchico.edu!olivea!news.hal.COM!decwrl!waikato!comp.vuw.ac.nz!actrix.gen.nz!dempson From: dempson@atlantis.actrix.gen.nz (David Empson) Subject: Re: Pinouts wanted Message-ID: Sender: news@actrix.gen.nz (News Administrator) Organization: Actrix - New Zealand Internet Service Providers Date: Wed, 15 Feb 1995 10:47:39 GMT References: <3hmlhf$pu4@blackice.winternet.com> <0Z9g1c2w165w@ersys.edmonton.ab.ca> X-Nntp-Posting-Host: atlantis.actrix.gen.nz Lines: 129 In article <0Z9g1c2w165w@ersys.edmonton.ab.ca>, Denis Fafard wrote: > plague@drift.winternet.com (Kent Squires) writes: > > > Does anybody know where I can get various pinouts for the IIgs > > (modem/printer/null modem)? Is there an ftp site or anything? > > > > Check in the Apple IIGS users manual! That or it's also in the Technical > reference manual. Actually, the pinout of the serial port is NOT listed in the newer user manual (the "Apple IIgs Owner's Reference" shipped with the 1 megabyte IIgs, a.k.a. "ROM 3"). It is given (along with all the other ports) in the original user manual (the "Apple IIgs Owner's Guide"). It is rather rarely that anyone would need pinouts of the IIgs serial ports, as they are identical to the Macintosh. The IIgs has the "general purpose input" pin, which is missing on some Macs, mainly the low-end ones; it is connected to the carrier detect input of the serial chip. If you can find an appropriate Macintosh serial cable for the function you need, then it will work fine on the IIgs. There is no such thing as a "null modem" cable with the IIgs, because the same pinout is used for all devices with a Mini-Din-8 connector (except for special adaptor cables, which may use a reversed layout to mate with standard cables or devices). To connect two IIgses (or a IIgs and a Mac), use the same cable that is used to connect a IIgs or Mac to an ImageWriter II. The carrier detect signal (pin 7) is not connected in these cables. A IIgs/Mac to serial printer (DTE) cable may be somewhat rare. It probably doesn't connect to carrier detect. Flow control lines will be DSR and DTR. IIgs/Mac to modem (DCE) cables are common. There are two basic types: "standard" (uses DSR/DTR for flow control) and "hardware handshaking" (uses CTS/RTS for flow control, usually with RTS connected in parallel to DTR). Carrier detect is connected in both. To be complete, here is the pinout information for everything. IIgs/Mac serial port (Mini-Din-8), looking at the back of the computer 8 7 6 5 4 3 2 1 1 Handshake Out 2 Handshake In 3 Transmit Data (-) 4 Signal Ground 4 Receive Data (-) 6 Transmit Data (+) Only used in RS-422 (balanced) 7 Carrier Detect 8 Receive Data (+) Used in RS-422; must be grounded for RS-423/RS-232 The shield is frame ground A "null modem" cable (IIgs/Mac to IIgs/Mac/ImageWriter) is as follows (the cable is symmetrical): 1 ------------ 2 2 ------------ 1 3 ------------ 5 4 ------------ 4 5 ------------ 3 6 ------------ 8 7 N.C. N.C. 7 8 ------------ 6 Shield ---- Shield A "serial printer" cable (IIgs/Mac to DB-25 DTE) is as follows: M-D-8 DB-25 1 ------------ 6 (DSR) 2 ------------ 20 (DTR) 3 ------------ 3 (RxD) 4 ------------ 7 (Gnd) 5 ------------ 2 (TxD) 6 N.C. 7 N.C. 8 Connect to signal ground (pin 4 at M-D-8 or pin 7 at DB-25) Shield ---- Shield and pin 1 (Frame ground) A "standard modem" cable (IIgs/Mac to DB-25 DCE) is as follows: M-D-8 DB-25 1 ------------ 20 (DTR) 2 ------------ 6 (DSR) 3 ------------ 2 (TxD) 4 ------------ 7 (Gnd) 5 ------------ 3 (RxD) 6 N.C. 7 ------------ 8 (DCD) 8 Connect to signal ground (pin 4 at M-D-8 or pin 7 at DB-25) Shield ---- Shield and pin 1 (Frame ground) A "hardware handshaking modem" cable (IIgs/Mac to DB-25 DCE) is as follows: M-D-8 DB-25 1 ------------ 20 (DTR) and 4 (RTS) 2 ------------ 5 (CTS) 3 ------------ 2 (TxD) 4 ------------ 7 (Gnd) 5 ------------ 3 (RxD) 6 N.C. 7 ------------ 8 (DCD) 8 Connect to signal ground (pin 4 at M-D-8 or pin 7 at DB-25) Shield ---- Shield and pin 1 (Frame ground) If anyone disagrees with these pinouts, can they please E-Mail me, and I will post a correction. -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand