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Now that I have a 5126 Portable, I am finding my trackball to sometimes work and other times not, the culprit being those nasty Rubber Rollers. Using my Mitsutoyo Digital Calipers, I measured the following: 1. Metal Shaft Diameter: 1.0mm 2. Rubber Roller Thickness: 3mm 3. Rubber Roller...

NOTE! The motherboard has been ultrasonic cleaned, recapped, traces repaired, and cleaned again via ultrasonic. The Apple AC Power Adapter I am using has also been cleaned, recapped, and cleaned again. PROBLEM: I'm hearing a soft pop sound from the speaker every 10 seconds when my 5126 Backlit...

I will connect the spinner drive to get that data point. Thank you for all your kind help to date!

In my conversations with @eric regarding BlueSCSIv2, he recommended that I completely disconnect both power and the SCSI cable from my spinner drive so my testing could focus specifically on the SD card drive in question. So I have been testing MacSD separately but in the same way as BSv2...

@YMK I've also been talking to @eric via PM, and he asked me to install Macsbug and then enter the debugger by pressing CMD & PowerKey at the time of the lockup. When I do that, I see the following (two different screenshots because I tried it multiple times): To escape out of the...

I am seeing some incorrect info posted on the internet when it comes to ADB pin-outs, but it would appear the following should be correct (I think) when looking at the back of the LC575 motherboard. When I touched my multi-meter's Black/GND probe to one of the motherboard connector bolt...

The "no peripherals attached" part is problematic because you need an ADB keyboard in order to press the PowerKey and power-on the Color Classic Mystic. And removal of ADB devices while the machine is powered is not advised. When I have disconnected an ADB device in the past by accident, it...

Yes, but such is nothing new. The same is true when I try to boot from BlueSCSIv2. Pressing SHIFT allows it to boot to the Desktop. But it cannot be an extensions conflict, for two reasons: 1. I can boot my spinning platter drive just fine without pressing SHIFT. 2. I've spend hours...

@YMK Here's a video showing MacSD LEDs during booting into 7.6.1 at 43.2MHz (no lockup) and then at 48MHz (lockup):

I cannot answer that question until I test again, which won't be until late tonight after work. Thursdays are my late nights when I don't get home until past 10pm. Yes. As discussed in my earlier post, SCSI_Clk attaches to CK on the 53C96 SCSI controller chip, and SCSI_Clk is feed by Q_DIV_2...

Since I mentioned MacSD and BlueSCSIv2 in my previous post (posted 10 days ago) and received no reply until today, I will tag @YMK and @eric so as to glean their thoughts, even if it is speculation. (I'm speaking to Eric outside this thread about it now.) SUMMARY: With MacSD or BlueSCSIv2, my...

"Pound" is my frequently used term to say something has been stated and re-stated "repeatedly," even if each new post on the subject includes new and important information. And while that may be interpreted as a slight against anyone who has discussed RISK, it is in fact not, as per what I...

Very true. In my earlier posts, I sought to speak to us as individuals first, but it is true that a collective bitterness, sour spirit, and general pessimistic outlook can impact us negatively as a whole. I do wish to make clear that I was not saying this forum has such a problem. I do feel...

There's even a book on Amazon about the Coleco Chameleon here: https://www.amazon.com/-/en/dp/1837910537 Note the comment there by FutureMan. He specifically mentions "Sean Rox geek with social skills." Date: June 2023. Since the book includes the experience of Mike Kennedy, I can only assume...

By the way, Adrian's Digital Basement (a high profile YouTube channel, for those of you who don't already know), has chimed in here: I strongly recommend reading through the comments under that video. I did. There are gems in there, especially from Ron. I also recommend expanding and...

I see topic about "risk" is now being debated. I had spoken of the risk in being nice to people or trusting them, but now the talk is about risk to this forum for having taken a righteous stand in allowing this thread to exist openly. But the risk to this forum is not less or more than the...

I have read that sentiment expressed by many through the years, and I have a few thoughts to share about it. I personally have never made my being nice contingent upon how others treat me. If I did that, my love would soon wax cold. Instead I strive to do unto others just as I would have them...

It's important to bear in mind the "V" at the end of the part number means 3.3V operation. Consider this 40MHz rated PGA 68040 and its horrifically shocking price... https://www.rocelec.com/part/01t4w00000PPjCUAA1-MC68040RC40V Want to drop that "V" at the end and get a 5V version? Prepare...

Run the machine for 1 hour and give it the touch test, or use a good Thermal Camera if you have one. I personally can't keep my finger on a CPU that is 60°C or hotter.

Install Norton Utilities 3.5.3, then boot into System 7.1 or 7.5.5. Find "System Info" in the Norton app collection and run it. It's a Benchmark utility. It will tell you if the CPU has an FPU or not. Running the benchmark will tell you the performance, which should fall in line with other 040...