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If you want to be compatible with Apple's Switcher, don't forget to check it's low memory global before calling MFTopMem. Otherwise you'll crash (?) or get the wrong value. See Technical Note #158. That is so funny. I've been updating my Tiny Transfer program and cringing as I consume an...

Looks good. BTW: Gestalt in often implemented in compiler glue to provide basic services when the OS doesn't actually have Gestalt. Not sure whether Think C 4 provides that or not. For example, Apple provided this code, which (you'll be happy to see) mimics what you have already implemented...

I reuse parts across different models that I repair. Therefore, my capacitor list may not be optimized for this power supply. C19 C20 10x20 1000uf 10v 5mm ls A750MV108M1EAAE014 C18 13x25 2200uF 10v 5mm ls A750MW228M1CAAE010 C15 10x20 330uF 35v 5mm A750KW337M1VAAE020 C16, C21, C22 6.5x15 82uF...

Hold the phone! What is this? https://github.com/laniku/sys71src/blob/main/Interfaces/CIncludes/Perf.h Did Apple already create a performance library? You may just need to call this and then convert the report file into routine names via the debug data file.

BTW, it looks like Apple's Time Manager source code is available. It might help you understand what the stack (and registers) should like like when your routine is called. The exact Time Manager code will depend on your ROM / System. But, this might help...

Here's a possible approach. 1. Run a test program that shows an alert with it's address range when it starts up. Then have it do some heavy looping with occasional calls to WaitNextEvent/GetNextEvent. 2. Add a debug breakpoint in your Time Manager program. 3. Each time it breaks, dump the stack...

OMG. Your damage was far worse. I would not have even attempted your floppy restoration. Congrats on saving another Mac!

Macintosh IIsi computers don't sell for as much as other Macs from the time period. IIsis tend to have motherboard capacitor damage and the power supplies must be recapped urgently. They have medium speed, one slot, and built-in video, so they are sweet little machines if you get them working...

That's great news! Happy to help. I'm glad you are keeping the SuperMac monitor. They aren't making any new ones. : )

Here are photos of the SuperMac adapters that I presume they made to allow their monitors to work with internal video: DB-15 female on one end. DB-15 male on the other end. They pass the video signals straight through but contain the sense wires inside the adapter itself. Part...

Not necessarily. I just wanted to alert you to that option. In fact, I think a lot of the other card manufacturers also provided methods of selecting resolutions (i.e. via a rotary dip switch) other than via the monitor sense pins. I believe I even have a special cable that SuperMac made to...

Most of the SuperMac video cards don't require sense lines. Instead, they rotate through a series of resolutions and ask you to press the space bar when you see an image. Then, after booting, you can use their software to pick the exact display settings you desire. The setting is then saved to PRAM.

That's very interesting. Originally, my thoughts were just as to whether or not the power supply was becoming strained, and how much extra heat was being dissipated by the total board. But, your comment makes me wonder whether I need to learn more about measuring power at across frequencies. I...

🤫 Shhh! He didn't mean that folks. Just a late April fools joke.

Has anyone tested current draw and/or voltages on the 5V line at different frequencies? I thought @JDW measured voltage at various frequencies (maybe for Spicy O Clock), but I can't find a video with that information.

Very interesting. I wonder whether the intentional LC040 mask with smaller die per process is better at overclocking, versus the faulty 040.

Does anyone know if the 68LC040 uses the same die as the 68040. I mean, is the LC just a binned version of the full 68040 where the FPU failed testing? I suspect the 68LC040 is actually a different die, given that there seems to be completely different mask versions than the full 68040. Here...

Huh. Not what I expected at all. I am so accustomed to repairing LC power supplies, I got into the habit of thinking that every Mac needed -5V for serial. 33A of 5V. Wow.

This is amazing! I have a couple of Quadra 950s, but they are just too darn loud. I assume with the PWM fans that yours is pretty quiet? The speaker looks pretty chonky. Is it facing down, though? The power supply is 550 watts located underneath? Your transistor Q111 inverts the signal for...

I saw that. :p Ebay only has the 'J' package. It looks like this needs the 'TR' package. "TC528257TR" I guess I could get a quote through Octopart