Drew ][ TDX – New Demux Switch

Ever since I started this project I had noticed a small issue where occasionally you would hear sound/artifact on the wrong channel. I noticed this most notably in the game Silpheed on the intro music…(believe me I spent a lot of time just sitting there listening to it lol). I had chosen to ignore this as my Audio Animator also did this, so I chose to accept that either I was hearing things and being rather anally retentive or hardware does something a little differently to emulation (All I could compare too). With the Apple IIGS Hardware guide also suggesting to use the MC14052 Demux I concluded that its just the way it is…

Well it seems the I chose to ignore my advice and recently picked up some other newer demux chips by Philips (74HC4052N and/or 74HCT4052N). These have a quicker switch rate than the MC15042B and are pin compatible and I was pleased to hear that the issue went away 🙂

I will look at sending out replacement demux switches FOC to everyone that purchased a card over the next few months and once the laptop cards gets all completed. You will then be able to just remove the MC14052 and drop in the new one. You probably won’t even notice the issue on your card when you using speakers as I spent a lot of time with headphones, which makes it more noticeable, so don’t panic 😉

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