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It was the same when my Micron Xceed card had VRAM related issues. Switching between color and grayscale or switching between number of colors would sometimes resolve the problem. But ultimately, replacing the defective VRAM chip was the solution. Congrats on the purchase of that excellent...

Will there be a part II video where you show us the same desktop windows again to see if the problem you showed at the beginning of your video vanishes with that different video card? Before you even mentioned having discussed it on Discord, I too thought it might be the video card —...

Cost is a valid consideration, and bulk buys would be nice if they generated discounts, but I must say this. I've tested v2 with a wide range of Macs, and even on a slow, stock 8MHz Mac SE, benchmark apps across the board show the v2 to be faster. Noticeably? Well, that would depend on you. I...

Oh, that photo was of a IIfx? I don't have a IIfx either. But what I wrote about tantalum capacitors still is correct info. If that C1 is across a 12V rail, it explains the burn.

I do not own a IIsi, but it would be interesting to know more info about C1, such as: 1. What is its capacitance and VOLTAGE RATING. 2. Does C1 see +12V across it at any time? (Is it on the 5v or 12v rail?) I've seen so many bad designs, even from Apple, using under-rated SOLID tantalum...

I assume that 5.4v you measured from the power supply was with the PSU disconnected and in the no-load state, correct? If so, what is your loaded state? Do you measure something more along the lines of 5.0v when the power supply is driving the motherboard and with the computer on? Because if...

@wottle Did you get all the bits of tiny dirty particles out prior to deyellowing? May need to use 409 or 100% IPA (something strong, but not brutal) to get the teensy tiny grime out, as that can cause lackluster deyellowing results. You may need to use the rough side of a dish washing sponge...

I too have a Daystar PowerCache accelerator in my SE/30, but mine is the CPU-socketed type which requires a socketed 68030 CPU type motherboard, but NO ADAPTER. That type of PowerCache looks like this: (Photos taken back in 2013, so ignore the motherboard caps and PRAM battery. MB has been...

Love your web page overview of those batteries! Top notch info! (y)

It really is an incredible design. If you read through the opening post again, you will see it is an 8-layer PCB! It was then made in a very lovely matte black, with gold ENIG plating. The amount of time invested in engineering that card by a single person must have been substantial.

Yes, so not only is the PCB thick from the get-go, and not only does it include two sets of ROM clips (for the 2 ROM socket types that lack metal tabs), you also get little stickers too, just in case the already-thick PCB isn't quite thick enough. Fantastic solution overall!

Congrats! I'm in the same boat with a non-functioning RCA/Composite output (the stock plug) on my Apple IIc, but Plamen's IIc-to-VGA adapter which I have basically does what you did. It taps the Composite output from the 15-pin connector, which interestingly enough works perfectly!

When I made my ROM SIMM video in Sept.2023, only the GW4402A SIMM was out, but @Zane Kaminski revised it and that is what we know as the "B" edition. It's an incredible SIMM, and I want to do a video about that SIMM alone. Right now though, I'm waiting for an answer from Zane about how to...

Black is the RAM used right now. White is the RAM that still can be used. Black + White together is the total RAM allocated to the Finder, System, etc. And don't forget that you can change the RAM allocation for apps merely by selecting the app, then open the Get Info box (screenshot below...

System 6 requires 24-bit addressing, so anything beyond 8MB isn't free memory that apps can take advantage of, although extra RAM can be used as a RAM disk with third party software. In System 7.1 and 7.5.3/7.5.5, if you have 32-bit addressing OFF, it's basically the same situation as if you...

But in addition to 4pcs of 16MB SIMMs in Bank B, you also have 4 SIMMs in Bank A, correct? You always need to have something in Bank A when filling Bank B.

If it measured 85°C with a fan, I would be very surprised! Probably measures in the 40's, but you would need a thermal camera or maybe a cheap IR thermal meter to check it more accurately. Thermal cameras are neat because you can point them at the whole circuit board and see how hot certain...

I don't own a IIsi, nor have I worked on one, so I can't tell you from personal experience what it might be. However, I think it would be helpful to others with IIsi experience if you could post clear, hi-rez photos of your motherboard. That might help others come along and identify problem...

One interesting thing I have found is that sometimes 85°C rated caps have lower ESR than 105°C. I've never quite figured out why, but it has often been the case when I swap out caps for old electronics. It then becomes a question of which is better. Longevity with higher ESR or lower ESR...

Thank you for the photos! What I deliberately wrote was based on seeing what most everyone else in this hobby perpetually sees (primarily Maxwell brand exploded batteries which take out many a machine), so my deliberately severe reply reflects the severity of the problem. I don’t think it can...