Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!purdue!mentor.cc.purdue.edu!pur-ee!young From: young@pur-ee.UUCP (Mike Young) Newsgroups: comp.sys.ti Subject: Re: 99/4A cassette port pinouts requested Summary: Here it is. Keywords: TI 99/4A pinout cassette orphan :-) Message-ID: <14177@pur-ee.UUCP> Date: 17 Jan 90 18:24:53 GMT References: Reply-To: young@pur-ee.UUCP (Mike Young) Followup-To: comp.sys.ti Distribution: na Organization: Purdue University Engineering Computer Network Lines: 39 Yes, just about any cassette player will work. If all you want is to read the tapes, you need a plug to fit the player's earphone jack. Many players also have a motor-control jack (frequently a submini phone jack); this can be used IF its polarity is correct. If not, no problem; it's optional. The connection to the 99/4A is a 9-pin "D" connector on its backside. Don't confuse it with the 9-pin D on the side - that's for the joysticks. Pin Function ___ ________ 1 motor control, cassette 1 center conductor 2 " " " " shield 3 microphone connector ground return (shield) 4 N/C 5 mike connector center conductor 6 motor control, cassette 2 center conductor 7 " " " " shield 8 earphone connector center conductor 9 " " shield The microphone connection is only used for recording data onto the tape. In the stock TI cable, Cassette 1 gets earphone, mike, and motor control conn- ections; Cassette 2 only gets motor control and mike. The TI Basic cassette routine also forbids you to read from cassette 2. I recommend using a battery-operated recorder to avoid possible AC line interactions, and avoid AC hum as well. Hope this helps. Mike Young Purdue University EE Dept. W. Lafayette, IN 47907 young@ecn.purdue.edu ...!pur-ee!young