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sfiera

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  1. I’m not familiar with the LC series, but I know that early analog boards (128k/512k/Plus) have -12V (and not -5V) and I thought that was likewise for RS-422/LocalTalk. Do the specific voltages matter, or do they just have to be far enough apart? Wikipedia suggests to me that ±5V is correct for RS-422, so maybe the Plus is doing something else that I don’t understand.
  2. Oh, by the way, I could also lend you the mouse. PM if you're interested.
  3. Like I said, I don’t have a good way to measure it. I pulled out a tape measure. 11mm sounds like a good guess for the length (it’s hard to get a tape measure in there). I think the diameter is smaller, about 5mm. Just to be clear, the markings say 6.3V, not 63V.
  4. Oh, the chip’s different: Yours has a 74LS14N inverter. The µPC339C appears to be a comparator.
  5. It has a M812M0100… (1988) serial number, so it was probably a Plus mouse, but I don’t know if I can say that with confidence. Your mouse matches a G447M0100… that I have. I saw another, seemingly older mouse (no chip) on the forums as well. By the way, here’s the underside. There are a lot more components, not just on the top:
  6. They appear to be 47µF 6.3V capacitors: I don’t have a good tool for measuring size, but from the profile, the height appears to be slightly more than the switch box and slightly less than the switch button. I think the case leaves them some good clearance too.
  7. Ultimately, this got down to ¥140,000 (~$1400) without any takers, and was then delisted. Oh well.
  8. System 6 doesn’t have built-in file-sharing, though the Classic Mac Networking guide and vintageapple.org site list some System-6 compatible server software: AppleShare v2 EasyShare demo (10 minute time limit) Oscar, SingleShare, Public Folder… I don’t have experience with any of these options. AppleShare apparently requires a dedicated install, so while you could have two System 6 Folders, it might make more sense to have System 6/7 Folders, and use System 7’s built-in sharing.
  9. Yeah, if the LC is set to output VGA (640×480@60Hz), then it should work. Just a question of setting up the DA15-to-VGA adapter right. (There’s also a separate, Mac-specific 640×480@66.7Hz mode, which I think would work on modern displays, but not old ones)
  10. Perhaps they’re confusing the vertical scan frequency and the horizontal scan frequency. The 12” 512×384 display that was introduced with the LC has a vertical scan frequency of 60.15 Hz and a horizontal scan frequency of 24.48 kHz. Modern monitors can handle 60.15 Hz vertical, but likely not 24.48 kHz horizontal, though it’s more that 384 lines is too narrow and 24.48 kHz reflects that narrowness. It’s not really a concern either way, since an LC can support 640×480 in 16 colors.
  11. I tried, but I didn’t make any progress. There’s not really room to get much leverage there. I also tried inserting a coin under the hinge, but that didn’t help either. There might be room to slip a thin wrench underneath to keep the insert from turning, if I knew what size was appropriate. (assuming the insert is hex-shaped) I guess the extreme option is to cut the head off the screw or drill it out. I don’t have the tools for that, though.
  12. I have two iBook clamshells I’ve been working on. I stripped them down this far, but in both cases I got stuck at the screw holding the left hinge, the one dead center in this photo: It turns freely, but won’t come out. There’s enough of a gap for the grounding cable to rotate, though. I tried forcing the screw upwards, but didn’t make any progress. The screw on the right hinge comes out without any trouble. A stuck screw is no surprise, but I wasn’t expecting to get stuck on the same screw in both iBooks. Is there something I’m missing? Is there something about t
  13. I should maybe add: I don't have any personal experience with this mode. It was just something I found in the LC III Developer Note (p14, “VRAM”) while researching video modes and parameters. The LC 475 Developer Note does not mention it, nor the Technical Specifications pages for the LC 475 or LC II. I guess it was really specific to the LC III. Timing-wise, the LC III’s 640×400 is identical to letterboxed 640×480 (pp21-22).
  14. Yes, I don’t know if it was a technical limitation that kept B/W compacts at 512×342 and more—that’s the hardware and software they already had, so why change things? As for 640×400, this was available on desktop Macs too. Machines with 512k of VRAM (such as the LC III) can display 16-bit color at 640×400, are limited to 8-bit color at 640×480. The same consideration may have driven the choice of resolution for the Powerbook 100; 32k VRAM will get you 640×400 at 1-bit but not 640×480.
  15. Seems that all B/W compact Macs have that; compare for example the Macintosh 128k page. That table is labeled as being about “Video Memory” which I think is only really relevant for models that have multiple display options. For external displays, 512×384 is an option but 512×342 isn’t. It’s probably just a standard table that they didn’t bother to specialize for compact Macs.
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