Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!UTCVM.BITNET!MQUINN From: MQUINN@UTCVM.BITNET Newsgroups: comp.sys.apple2 Subject: Re: Is sound recording/playback possible on apple IIx? Message-ID: <9008310037.AA07154@apple.com> Date: 31 Aug 90 00:18:10 GMT References: Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 43 If you want to digitize sound on an Apple // (I assume the original message was talking about this?) I don't know of any specific hardware for this (although I'm not saying there isn't any,... just that I don't know of any), but I used an old ComputerEyes (when it was new) on my old Franklin Ace 1000 (Apple ][e compatible). I wrote a machine language program (about 3 lines) that would play sound to the Apple speaker live while an audio cable was plugged into the computereyes. I wrote another one that would record and playback the sound... this is a crude program... more like a pre-pre-pre-alpha version... but it worked. If you want to do it yourself, you have to do a read from one of the gameport I/O addresses (I can't think of which it is right now, but the information should be in any apple // tech. manual). After you do a read from that location, you must do a BPL READ... like this READ LDA $IN-ADDRESS ;I forgot this address BPL READ LDA $C030 LDA $C030 JMP READ (Well, OK, so it wasn't three lines :) I'd finish this program and make it menu driven and all that good stuff, but an EX friend 'borrowed' my computereyes and 'loaned' it to someone whom he doesn't know their name, phone number, address, and can't remember what they looked like!! I've been trying to get in touch with him for the past year with no luck... anyway, that's another story. It wouldn't be much more difficult to store the digitized info into memory and save it to disk, then play it back... except I had a hard time getting the playback speed set just right. ***** WARNING ************************** If anyone tries this with their old computereyes... MAKE ABSOLUTELY SURE YOU DON'T SEND TOO STRONG A SIGNAL INTO THE COMPUTEREYES OR YOU'LL FRY IT!! Believe me! I've learned from experience! One good rule of thumb is don't plug the output from your 130watt Gorilla amp into the computereyes! Here's a neet trick... run the old video digitizing software with the ComputerEyes while you have an audio signal plugged into it and adjust the sync. You'll get a wave form on your hi-res screen!