+OLD CS1 Posted December 4, 2016 Share Posted December 4, 2016 I spent time tonight modifying my four Speech Synthesizers to allow AUDIOIN and +5VDC power pass-through. Not professional work by any means, but nothing is shorted and all four work. The AUDIOIN modification is good for Marc Hull's SIDMaster99 as the Speech Synthesizer is stingy with that line, using it for itself only and not passing through the incoming line from the PEB. (Why would TI do that in the first place?) The +5VDC modification allows for powering devices like the nanoPEB† and CF7+†, as well as jedimatt42's 32k expansion card. †These devices require modification to obtain power from the console. •The AUDIOIN line will also come in handy for possible future expansions using the 32k expansion's pass-through connector ) 7 1 Quote Link to comment Share on other sites More sharing options...
+jedimatt42 Posted December 4, 2016 Share Posted December 4, 2016 After getting a SID Master 99, from Marc, I was astonished to find out that TI terminated the audio in line in the speech synthesizer... That just made no sense, particularly when they built the expansion box to support an audio-in line... At least as you've illustrated, these are some pretty straightforward mods to make to the speech synthesizer. Omega also illustrates the power mod in his video showcasing my 32k card. -M@ Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted December 4, 2016 Share Posted December 4, 2016 So does it mean that the SID Master card won't produce any audio if the speech synth is attached without your mod? I have the card, but have yet to use it at all... A real shame... Quote Link to comment Share on other sites More sharing options...
+jedimatt42 Posted December 4, 2016 Share Posted December 4, 2016 So does it mean that the SID Master card won't produce any audio if the speech synth is attached without your mod? Yep. Or move the speech into the PEB, or inside the console. But the mod is so trivial, it isn't but a few minutes of work. This was the first thing Marc pointed me at when I didn't hear any SID output. -M@ Quote Link to comment Share on other sites More sharing options...
+acadiel Posted December 5, 2016 Share Posted December 5, 2016 I'd love to pick the engineer's brain about why they didn't do that... I can understand possibly being concerned about power consumption for the +5V, but the AUDIOIN pin is probably a trace that someone just didn't want to route. 3 Quote Link to comment Share on other sites More sharing options...
Airshack Posted April 22, 2018 Share Posted April 22, 2018 Wondering if anyone here keeps in touch with any of the original TI-99/4 design engineers and/or software programmers? Interviews with these long lost friends would make for a pretty good podcast? Sent from my iPhone using Tapatalk Pro Quote Link to comment Share on other sites More sharing options...
Airshack Posted April 22, 2018 Share Posted April 22, 2018 Links to the Audio-In and 5v pass-thru mods? Sent from my iPhone using Tapatalk Pro Quote Link to comment Share on other sites More sharing options...
jjh76 Posted April 22, 2018 Share Posted April 22, 2018 Click on the image album in the first post, no instructions needed the pics show it all Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.