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eraser

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  1. eraser

    G3 Chip Compatibility

    Thanks trag! The interesting thing about the G4s was that if a new G4 with L2 cache was attached to a new CPU board it would treat the former L2 as L3 cache. I was hoping that was the case with the G3s.
  2. Does anyone happen to know if the entire range of G3 CPUs are pin-compatible with one another? In other words, can a 750FX (Sahara G3) be soldered onto a CPU card in place of an original G3 (Arthur)? I know that the G4s are surprisingly interchangeable and I am hoping that the G3s are as well.
  3. eraser

    Does anyone know how I might get this off?

    Thanks guys. I will experiment on a small section. I expect to retrobrite this Mac as it is because of needing to replace the faceplate too and the color doesn't exactly match. So I will get the case one uniform color one way or another.
  4. eraser

    Bad caps leading to slow performance ?

    The Performa 400 did indeed ship after 7.0 was released BUT "Performa" is only a name. All Performas are repackaged Macs in a "consumer friendly" way. That is, a Performa is a base model Mac (LC, Quadra, PowerMac, etc) that is given a Performa name and number and packaged with a collection of software and hardware meant to appeal to consumers. The actual logic board is identical. So, even though the Performa 400 shipped with 7.0, that Mac is electronically indistinguishable from an LC II and therefore can run any OS that the LC II can run ... because it's an LC II with a different name tag.
  5. It looks like paint. I hope that there is some way I can remove it without ruining the case plastic.
  6. eraser

    Bad caps leading to slow performance ?

    A Performa 475 is NOT an LC III. The Performa 475 is a 68LC040 and despite also running at 25 MHz, it will absolutely crush an LC III at everything. It's not even close. As Gorgonops pointed out, there is a 5x difference in performance from the 475 to the LCs. That isn't an exaggeration. The LC and LC II are the slowest color Macs. They were slow the day they were made and they are slow now. Appreciate them for what they are and don't expect too much from them.
  7. eraser

    No sound from Color Classic

    If you keep running this Mac without recapping it the damage will be permanent. There is zero doubt the caps have leaked and they are now no longer providing the proper capacitance. You are putting all of your ICs at risk by using it in this state. If the analog board/PSU hasn't been recapped it needs it too.
  8. eraser

    My First Recap - LC

    One more thing to consider: Identify the SERIES of capacitor in the original design because that matters too. I'll give you a real-life example. The power supply in the Quadra 630 uses quite a few United Chemi-Con SXE capacitors. If you look up the SXE series you will find that these caps are low impedance. When choosing your replacement cap you will want to also find one that meets all of the specs above (capacitance, voltage, temperature, size) but also is a low impedance design. You will also find caps in Macs that are low ESR (effective series resistance) and a few other features. Keep in mind that specialty caps like low impedance and/or low ESR are more expensive and if the engineers and bean counters decided that they were worth the cost then there is probably a good reason why they're there. If you can't identify the series of capacitor or if it seems generic then chances are it's just a "general purpose" cap. I'd also mention that you shouldn't use those specialty caps in place of general purpose ones because they can cause problems. The design of a particular circuit may depend on the resistance and/or impedance of the capacitor to function correctly. Suddenly eliminating that characteristic will change the behavior of the circuit in possibly undesirable ways. Yes. All the electrolytics must go. All other components can stay as long as they are not obviously burned or physically damaged. If you see a scorched component or PCB in a power supply that is a sure sign that something went very wrong at that spot.
  9. eraser

    C1 from "Classic Mac Repair Notes"

    Awesome, thanks guys!
  10. In "Classic Mac Repair Notes" it suggests replacing C1 with a special arrangement: Does anyone have a picture of what this looks like? It's hard for me to visualize.
  11. eraser

    PB3400 - Battery refuses to charge

    Are these rebuilt batteries? If not, there is no point in trying. The cells are long dead from age.
  12. eraser

    ImageWriter II Ribbons

    Pictures of new and old IW II ribbons
  13. eraser

    New ImageWriter II Color Ribbons

    Of course now I have new ribbons that are cheap enough to not have to fool with trying to make one yourself. (And personally considering the incredible mess and pain of trying to stuff many feet of ribbon back into a cartridge it never seemed worth it to me to even try that.) Which extension would that be? I can test it.
  14. eraser

    New ImageWriter II Color Ribbons

    Well said! MacPallete II does have a few configuration options. I hope to play with them a bit and see how much of a difference they make. and ... There are different versions of the ImageWriter II. The early revisions of the printer are very close in weight to the original ImageWriter and nearly 40 lbs. The last model, released in 1990, is dramatically lighter. The power supply accounted for quite a bit of the weight in the early ImageWriters. If you take one apart you will see why. There is one transformer in there that has to weigh a good 10 lbs all by itself. The weight difference between the 1980s and 1990s ImageWriter II is so much that I am certain that I could pick up one of them blindfolded and tell you exactly which model it was.
  15. eraser

    New ImageWriter II Color Ribbons

    I'm impressed with the ImageWriter II's color printing. I've been printing random color pictures on it just to see how they will look. Nobody would mistake its output with a modern photo printer but for a 30-year old dot matrix it does a good job. When using MacPalette II it prints the same page/image in 4 separate passes. Each pass adds a different primary color from the color ribbon. I find it really interesting to watch the image slowly appear on the paper as it mixes in each new set of colors. In terms of print speed though, it is incredibly slow. A full page color graphic or photo will take maybe 5-10 minutes to print including the time it takes for the machine to build the color maps.
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