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  • Posts

    • It should be 500kbaud, but it's mostly just symbols at certain code points. I should really get a proper debugger some time...   Thinking about this more, I wonder if it might be a power problem: the Ethernet controller draws extra juice to transmit, and it might be enough to cause the MCU to do a brown-out reset if the USB power source isn't up to the task. I was thinking of adding an LED pattern on reset so you could see it, but if you tie into the debug line you should be able to observe a reset that way too.
    • Also, frequency of operation of the components.  I would expect interference generated by a G3 to be significantly higher-frequency than from an older machine, because most of the bits are running faster.  I remember that (according to Johan Johansson, anyway) when the IBM 1401 was introduced to Iceland, they used to play tunes on it by accessing memory at the right frequencies and tuning an AM radio beside it.  I doubt that would work any more unless you had a multi-gigahertz AM radio...
    • Most if not all Apple logicboards of that era are at least 6 layers. SE was 4 layers, not sure about the Mac II but everything afterwards was min. 6 layers.
    • You cant swap the motors unless you re-align the drive. otherwise itll never work again. 
    • These are minimum 4 layers, probably 6 layers. 
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