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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

1152x870 is the best I ran across. However, with 1.5 MB of VRAM, I would think it could do more at 8-bit color.

A short update: I tried this video mode. I thought it was going to be some weird split screen or require a toggle key. The Vimage card is set to the same resolution as the internal video. When you scroll the mouse cursor to the side of the internal video screen, the image switches to where the...

Photos of the GrandVimage 17DU card. Bodge crystal and bodge diode. Nice choice of resolutions. 80 MHz clock and 1.5 MB of VRAM.

Here's a treat for @daanvdl if he hasn't already seen it. The Interware GrandVimage 17DU LC slot video card has a connector that installs in the video slot. This enables a variety of choices for monitor output. Going left-to-right and then the second row: 1. Disable the internal monitor and...

I can confirm the Power Macintosh 4400 can indeed reach 160 MB of RAM.

What a surprise! That's crazy. I would never have believed that.

Also... no Color QuickDraw in them SE ROMs.

Congratulations!

Thank you for the follow up. This makes a lot of sense, since the chip is written to 16-bits at a time. To reverse the process, either flip 16-bits at a time, or flip the bits of each byte and flip byte pairs. That Python code is nice and simple.

I just looked more carefully at the picture of your card and realized how many different 'Thunder' cards there are. Ignoring the additional terms such as '8', '24', 'GX', 'GT', '1152', '1360', '1600', there seem to be at least five different generations of 'Thunder' cards. NUBUS SuperMac...

The printed SuperMac Thunder II GX Product Update Notice says: I recognize you are asking about the Thunder (I), not Thunder II. Also, I recognize the SuperMac is less than helpful in providing only a single sentence, rather than an explanation about what exactly is not compatible. FYI. You...

Yes. Agreed. All three examples print as straight 7-bit ascii after having the bits reversed in each byte. However, the first example "Golden Software" needs its byte pairs swapped as well. I don't know if that got written using a different process. In any case, cool work on REing the NVRAM.