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The pop sound does NOT occur every 10 seconds when I boot into System 6.0.7 or 6.0.8 while also (1) loading "Portable" control panel version 1.2 (which is made for the 5120 and therefore lacks a "Brightness" slider, using Contrast instead), or (2) not loading any version "Portable" control panel...

Meaning these two electrolytic caps... As shown on the 5120 schematic... And shown as C2 and C3 on the LT1070 datasheet... Yes, that is what I am hearing and is what I have been calling a "pop" sound.

And here is the Macintosh Portable sleep-fix on my BSv2 "fork" board, as per the Github instructions for 2023.03a:

So that command line I tested last night is disabling only U14A, while leaving U15B & U15C enabled, correct? I can only assume so because as I said last night, the background noise all went away when I tested your suggested command line, but the pop sound every 10 seconds remained audible...

There are grounds all over the motherboard, so the best way I can answer that question is with the... 1. Schematic here (keeping in mind I have a 5126, and the schematic is for the 5120). 2. 5126 board Photo below (by Bruce Rayne of Branchus Creations, not my board)

Thanks, I will do that tomorrow!

@SuperSVGA I booted my Portable into System 6.0.8 without the Portable control panel loaded. I pressed Interrupt, and at the prompt, I typed the following and pressed Return: SM FB0802 1 Suddenly, all the noise stopped. And I should say that I can very faintly hear the same background...

@Androda Sorry for my delayed reply. I've been busy testing the Portable's audio issues here and didn't have time until today to revisit this thread. QUESTION: The text on your Github page says "either... or..." and not "both" so I just want to reconfirm that info is accurate. I am talking...

QUESTION #1: As per the above, did you ever check that the 9V battery works properly? QUESTION #2: So when there is no lead acid main battery in the machine at all, that 9V battery would be keeping the 5.2V rail "powered all the time"? (The same would be true if the AC Adapter cord was yanked...

Joe, thank you. As far as the Radius Rocket with RocketWARE is concerned, it boils down to this... Compatibility: The Rocket hates sound.* The system tricks it uses to run make handling sounds a pain (if not impossible). Do not install Sound Manager 3.0 or later! It can handle SM 2.0 for some...

I did a search on Macintosh Garden for "microbug" but it yielded no results. If you meant to say "MacsBug" then please let me know what version I should use under System 6.0.7 and higher. I will then boot with your recommended version of MacsBug and give your command line and noise-check a...

I use the DIP settings below on my UniMacFly adapter with my Mac IIci, either with onboard video or the Radius Thunder 24/GT. That allows the attached VGA LCD to display 640x480 just fine, and I can switch to higher resolutions with ease too, all without changing the DIP SW settings. It's...

Regarding "Sound Manager 2.0" which is RocketWARE compatible, I found the following info today... The Sound Manager was first introduced in system software version 6.0 and has been significantly enhanced since that time. Prior to system software version 6.0, applications could create sounds...

Thanks. I also just confirmed that the RadiusWare 1.5.1 Patcher is found inside Download #1 on Macintosh Garden here: https://macintoshgarden.org/apps/radius-rocket-software I also updated that Macintosh Garden page with more info to credit you, Joe, and to make it clear the 1.5.1 patcher can...

Sorry, but I can't find a link. What is the download link on Macintosh Garden? Remember, this is Tinker Different, not one of those other forums. Here, freedom reigns. Especially so because I created this thread. Besides, logic dictates that all of your posts are on topic insofar as they...

Thank you for providing those details. What I can say for now is that I have installed System 7.1 and Update 3.0, but I disabled the Sound Manager extension and I restored version 8.0 of the sound control panel. But I also confirmed that even if I use version 8.01 of the sound control panel, it...

Some truly helpful info. Thank you, Joe! If I clean install 7.1 or 7.1.1 Pro, it includes Sound control panel version 8.0, but no Sound Manager extension at all. You are basically telling me that means I have Sound Manager 2.0, hidden somewhere like inside the System file. Correct? But the if...

Still have no idea where to find the Rocket-compatible Sound Manger version 2.0, so if any of you do, please don't hold back. Separately from that... I found the RAM buffer (and Parity checker) ICs get hotter than the CPU on the Rocket. Datasheet...

I do, but the cost for me to mail it to you within Japan is probably not much cheaper than if you were to buy it from AliExpress like I did. Shipping was surprisingly quick too. https://www.aliexpress.com/item/1005001917803982.html I won't be able to mail anything until Monday anyway because...

@David Cook I didn't get much testing done this evening because I burned through all my testing time trying to get my scope to cooperate. Worked fine with the function generator earlier today, but with the actual Mac Portable motherboard readings, it's different. The actual motherboard...