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Oberlehrer

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Everything posted by Oberlehrer

  1. I seem to recall that the power supplies in the MDD G4 failed quite often; and I think this was also a cap issue.
  2. Check the completed listings on ebay for SE/30s that were actually sold. 300 € might be reasonable for a unit in good condition. Computers that boot but show problems seem to sell for under 200 € in general. But admittedly the prices can also be on the high side. To give you an idea: During the lockdown I bought one SE/30 "non working" (which turned out to be a Maxell bomb) for 80 € and another one "working but without sound, no peripherals included" (which needed recapping) for 50 €. Both from "ebay Kleinanzeigen" which is separate from ebay (basically classified ads).
  3. I was able to make the IIsi talk to a NEC Multisync EA190M and a Panasonic Panaflat LC50s but not to a DGM 19" display. The latter works with nearly all my classic Macs though - but it also refused to cooperate with a NeXTstation so maybe it's the display itself. I think NEC MultiSync monitors have a very good track record being able to connect to nearly any signal. When I looked at the schematics a while ago I found them slightly different in the display circuitry compared to other machines from that era (notably the LC) so the IIsi might be the "odd one out".
  4. A couple of interesting things in this circuit: AGND and CMMGND pins are both connected to digital ground. Usually AGND signifies analog ground. For some reason both sides also have different capacitor values for identical circuit positions: C6 is 1uF while C24 is only 0.1uF. Also, the numbering for C24 is somewhat out of place; based on the rest of the circuit I would expect this to be C7. Any ideas for the reasoning behind this?
  5. As I said I will be able to make detailed tests only after I got it recapped. It might well be that you are correct about this. My experiences come mostly from a (recapped) IIsi (same timeframe albeit different video subsystem) which is behaving somewhat strange in the video department. I'm using dip switch adapters for the IIsi and I have made the following observations: - adapter set to VGA/SVGA: none of my monitors work - adapter set to 640x480: two monitors work (a Panasonic PanaFlat LC50S and a NEC Multisync), the third one doesn't get any signal (or isn't able
  6. LC arrived. Dead power supply, logic board probably needs a recap too. But it boots in general. Tests will have to wait after I got everything in order.
  7. I'm not sure about this. My experiences with a IIsi are similar: adapter and monitor work with a different computer, adapter works also with the IIsi and a different monitor. Perhaps there is a sync signal that somehow differs. Anyway, I'll be getting an LC soon (condition unknown) and will run a few tests.
  8. Not sure if it is "working" in the complete sense. (Please correct me if I'm wrong.) That the floppy gets ejected immediately seems to indicate that the LC is not booting from the hard drive. Hence it's waiting for a bootable floppy - which the floppy in the movie obviously isn't. If it were actually booting from the hard drive the floppy would either not get ejected at all (if it was readable) or only after interaction (I think there would be a dialog box if it should get formatted or ejected). So it seems that the mainboard might work somewhat but the hard drive might have pro
  9. Yes, the "Pomeranian" part gave this away somewhat. Anyway, I've recapped a IIsi, a Performa 475 and an SE/30 so far; so if everything else fails it would at least not mean shipping the machine around the globe... Another thing: I think without the VRAM upgrade the LC supports only 512 x 384; not sure if the NEC will play nicely with that. I know that the NEC can do 640x480 without a problem.
  10. Dresden, Germany. If you were located in Zgorcelec or Jelenia Gora...
  11. Just out of curiosity: Roughly where in Poland are you located?
  12. I don't think I've seen such an LC "in the flesh" myself so far; the ones I've seen always had the (unused) cutout for a second floppy drive. So it seems Apple made a case revision at one point. I'm only mentioning this since you talked about buying a second case which seems to be constructed different. Make sure that the parts are really compatible. Other posters will probably know more about the different LC revisions.
  13. Having separate digital and analog grounds is not uncommon where I come from; no idea if this is also done with the Classic II though. Usually those are then tied together at a single point in or near the power supply (unless there are also separate supply lines for digital and analog IC's). Perhaps that point where the grounds are tied together is missing.
  14. Another thing worth considering: The Apple II had a vertical resolution of 192 pixels - exactly half of 384...
  15. 1024x768 is a standard resolution; 512x384 is exactly half of that...
  16. I think the 191 is very similar to the 190. NEC had always good compatibility. So I guess it SHOULD work if the computer outputs a correct signal and the adapter is working.
  17. The NEC I mentioned is a TFT, though. https://www.ebay.pl/itm/NEC-MultiSync-EA190M-19-1280-x-1024-250-cd-m-5ms-VGA-DVI-Weis-Silber/302801275915 Sure, that's twice as much as I paid for mine. Still not too bad.
  18. I bought an old NEC EA190M a couple of weeks ago that also plays nicely with the IIsi. Those monitors probably cost close to nothing everywhere; I paid 15 € for mine.
  19. Both the IIsi and the LC475 output at 66.7 Hz; and here that particular monitor works with the LC475 at 640x480 (and a PM8100 and a PM4400) but not with the IIsi. My guess is a different sync type.
  20. I don't know if this is a question of adjusting or of monitor features. Sometimes certain older monitors work better with older computers than newer ones. I have an old Panasonic LCD monitor for such cases.
  21. The Macs of that particular vintage are rather finicky as far as monitors go. I have a 19" monitor that works well with an adapter on my LC475 but not on my IIsi. Other monitors (even 19" ones) play nicely with the IIsi. The original LC and the IIsi came out at about the same time. Just a thought.
  22. ...and as soon as my desoldering pump made contact with the power supply board I knew how wrong I had been about the caps probably not having leaked. A familiar smell permeated the air... Anyway, after recapping the power supply I got a chime; and with the "jumpstart" method I also got video. So far, so good. But of course I got one cap with the wrong height so the lid of the supply won't close. I'll probably recap the logic board as well while I'm at it.
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