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One of the TIL articles you linked to on your spreadsheet discussed the low power ADB mouse. It has an icon of a circle with a flat top on the label. A quick check of my pile suggests this mouse is common. However, the version with a 1 inch plug seems to be a little less common. Here is an...

I placed a piece of transparency over the screen and marked the corners. I then pulled it off and measured it with a ruler. I am confident in those values (after correcting for mm -> cm)

Yup. It's late. : )

Here are a couple of technical tidbits for you... The Macintosh 128 & 512 had 20 bytes of PRAM. The Plus, Mac II, SE, SE/30, IIx, and IIcx bumped that up to 256 bytes of PRAM. The Portable shipped after all of those, but only had 128 bytes of PRAM. Worse still, Apple did not allocate the bytes...

I'm not sure which laptop the above measurements apply to. I just hand measured and got: Backlit portable: 21.1 mm x 13.1 mm = 5.157 in x 9.778 in = 9.78 in diag = 77 dpi PowerBook 100: 19.15 mm x 12 mm = 7.54 in x 4.72 in = 8.9 in diag = 84.8 dpi

No. The movement is so tiny and so fast you feel no vibration at all. The sound is pretty irritating (chalk on a chalkboard).

Another good use for the scaler is to remove the crusty buildup on the ends of leaky capacitor pads. This stuff does not come off easily with isopropyl or heat. I end up scatching it off with my soldering iron -- decreasing the life of the iron tip. Here is an example on an SE/30 pad: After...

Yes. I socketed the original board. Based on your question, I swapped the original chip back in, and the delay reappears. So, the Sony chip is definitely damaged. The pins are clean. So, it isn't corrosion causing some resistance which might act like an RC delay.

I recently received an SE/30 that was sold as working. Without trying the machine first, I broke it down, recapped it, and ultrasonically cleaned the motherboard. Unfortunately, upon powering up for the first time, I was greeted with the Simasima display. It turned out that there were several...

This is a fantastic guide! It helped me repair a board that I would otherwise have given up on. Are you sure page 46 has the correct frequencies? On two fully working SE/30s, I measure exactly half the frequency listed for each ROM pin.

I purchased a IIfx that appeared to be in great shape. No battery leaks. Light capacitor leakage (no damaged traces). I recapped it and cleaned it with an ultrasonic cleaner. With the original memory in Bank A and Bank B, I would get sad mac chimes. In Bank A only, it would chime but not...

Great question! Doing so would prevent MacsBug from recognizing the name of the function during debugging. It expects a name immediately after the rts.

Someone asked to have SimpleText open a smaller text window at startup. Initially, I assumed this would be a fairly easy fix by just overwriting a few constant values in SimpleText code. It turned out to be a pain -- but I learned a lot along the way. You need to have the code editor (from one...

If it were my board, I would remove both of those. Then, clean the area well to spot any broken traces. Then replace them with new parts. If you are going to go to the trouble of removing the old ones, you might as well replace them with fresh parts.

Yes! Absolutely. What worries me about your photo is that I'm not seeing any on-screen images from ROM. No cursor, disk, or desktop pattern. So, although I believe the video output circuit needs work, I suspect there is another problem as well. That should not dissuade you -- as your board...

Hello! Is that a 'before' picture? The capacitors don't look replaced. For example, C3, C4, C5, and C6 look original. If you haven't already, replace all the capacitors, then clean all corroded areas with isopropyl alcohol and a toothbrush. (And then an ultrasonic cleaner if you have one.)...

That surprises me, because BinHex's text encoding inflates a file by 1/3. Ahh, MacBinary does not have compression, but BinHex has run-length encoding. So, depending on the file, BinHex could larger or smaller than MacBinary.

Almost. You just need to put a null modem adapter between the two cables. Because you are a 128K fan:

Because there is not a serial port on our tiny little friend, I thought I would try a hack. From Adafruit, I ordered three parts ($20 total) that emulate a keyboard from text typed on another computer: CH9328 keyboard emulator: https://www.adafruit.com/product/5973 Logic-level USB-to-serial...

I agree. For bulk transfers, your approach and ZuluSCSI sneakernet are faster and more convenient. I just saw the enormous write-up you did for networking old Macs. Bravo!