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“Up” and “Down“ is kind of a misnomer. It’s more like “Y1” and “Y2”: two sensors, slightly offset, watching the same (I think) LED. They’re not independent, and the computer can’t detect vertical motion unless both sensors are working. I’m not sure if you can get useful readings off the pins...

Having thought about it more, you probably want Apple Partition Map files, not just HFS images, so the process outlined above is a better bet. Sorry!

Assuming it’s just raw HFS disk images you need, here are some premade ones along the lines of Gryphel’s blanks. Blank images compress down really well, so whenever you need one, you just decompress a new disk. The Gryphel blanks are generally small (400K floppies up to a couple hundred megs)...

For checking the light: cell phone cameras are typically more sensitive to IR than human eyes are. It’s a good trick for checking the batteries of a remote control, just point your phone at it. It works similarly well for checking the trackball LEDs:

Oh, is that what those holes are for? I assumed it was explicitly to catch that gunk, as opposed to letting it clog up the rollers and interior. I need to oil mine. Do I just drop some oil on the ring and spin the rollers for a bit? Not sure what I have around, maybe some bike chain lubricant...

Now that’s my idea of a fun weekend. I dug a little more: there has been a 64-bit LongSecs2Date in Script Manager at least System 6 (per Technote TE09). It would need an analogous patch, though if Apple was already preparing for 2040 in the 80’s, it would be nice if they’d finished the job!

I’m probably speculating too much here. I certainly don’t have the knowledge or skills to make this happen now. But hey, 20 years to prepare, right? What could go wrong?

I think so. What would happen when moving the file to a modern computer would depend on how you moved it—if via AFP, the receiving software would need to agree on the interpretation of timestamps. The other scheme that’s worth considering is one with variable precision, where you halve the...

I’d say it’s still mostly a software issue, just one with more difficult tradeoffs. A 32-bit number of seconds can only represent a range of 136.1 years, but while those 32-bit numbers may exist in a lot of places (filesystem, protocols, PRAM) their interpretation is up to software. It might be...

Boot with extensions disabled (shift) and see if the problem persists? I believe that extended keyboards have a different ADB profile that assigns the left and right modifiers different key codes, whereas their key codes are equal on compact keyboards. If the common factor is the computer, it...

The Mac Plus schematic indicates that pin 6 is not connected at all. Here’s a thought—what happens if you plug in a regular mouse and hold down the button when launching the game? It could be as simple as Mac•Man checking for the mouse button being held down (pin 7 being grounded), on the...

I would guess it's an RS-232 adapter for a 128k/512k. Maybe for an ImageWriter?

Oh, for completeness, here’s a bunch of pinouts for various kinds of bus mice: https://deskthority.net/wiki/Bus_mouse

Yeah. In Japan, NEC was making PC-98 bus mice up until 2000 or so. But, ADB mice are what I have (more than I need of) and I like the “right yet wrong”ness of plugging a Mac mouse into a Mac, except it’s an ADB mouse and a Plus. Speaking of of “right yet wrong”, Apple even made a certain USB...

Actually, the reverse, I think: It’s hard to tell from the picture, but the rollers in the 1995 model on the left match the positions in the schematic, and the 1997 model on the right has them in the same position as the first PCB I looked at. It seems that the 1995 model is less PCB/more...

I got a DB-9 cable to try this, opened a M2706, and found—of course—that the internals are completely different from what’s described above: The instructions call for the button switch to be disconnected from the board, but that’s not possible here without cutting traces. I assume that the...

I recently found a guide for ADB to M0100 mouse conversion [Japanese]. Here’s its schematic for the ADB Mouse II: Translations: A, Bはどちらでも可: Either A/B is OK [orientation on the mouse switch doesn’t matter] 基板上のJA, JBピンをはずす: Remove pins JA and JB from the original board [these are for...

https://archive.org/details/dr_dobbs_journal_vol_10/page/n721/mode/2up ?

It sounds like you have already managed to get files between the SE-30 and modern computers, maybe with Ethernet or a USB floppy drive? Could you explain a little more how you are doing that? In particular, .dsk files are raw floppy images. If you can write floppies, you can set up your...

And here’s one now: https://page.auctions.yahoo.co.jp/jp/auction/v722699378 …sort of. It’s a Dynamac case, but it looks like the case has been dremeled out in the back to replace with a Plus logic board.