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This is only for the sleep issue affecting that space of RAM above 5MB if that register is not accessed after a reset. There may also be additional registers that affect access times as well. The backlit Portable has faster RAM access times on the first 5MB of memory, and the rest uses the...

It's also important to note that this mapping is handled by ReadXPram/WriteXPram, not the Power Manager. If you are sending direct xPramRead/xPramWrite commands, you have to do the mapping yourself as all the locations are converted to 0x00-0x7F by the OS. The original 20 byte PRAM is also...

They do work just fine since the entire driver is in ROM: Getting it in the Powerbook 100 would be tricky, since you need both access to the bus as well as the signals from the CPU GLU, at least to implement it the way Apple intended. As I understand the SLIM cards got delayed because...

Sounds like chip erase but I think that's only the AM28F020A.

As long as it's running fully from RAM at the point that you switch ROMs it would work fine.

I did use an original TechStep, but I'm not sure where my original Vol. 4 cartridge is so I just built a new one yesterday. There shouldn't be much difference between the cartridges though, there isn't much going on in there. It is very odd though, making changes to display resolution shouldn't...

I believe both the ADB and SCSI entry methods are just putting the computer into test manager mode, same way you would do by hitting the interrupt switch on machines that have it. ADB is likely just sending the interrupt key combo (i.e. Command + Power) on machines that support it, and the SCSI...

Mine works fine on a stock CC with no mods. All tests pass except for sound on my board, though maybe I just have something broken there. Are you able to test to make sure serial is working properly, or check the -5V somehow? It did look like the TechStep was putting it into test manager fine...

The address line test failure (error 5) is a bit tricky to precisely decode because it's an XOR of the contents of memory against the expected value. My guess would be that it wrote 0x00010000 to location 0x00010000, but when it read it back it got 0x00000000. This would be the point where it...

I have this copy of firmware 1.55 that was on my computer. I'm not really sure why I have it, I don't have any SIMCheck hardware.

Does it happen when less than 5MB of RAM is installed? Sometimes the mapper register ends up putting the backlight in the RAM area.

Well if removing the Brightness control panel does not change it, then I'm guessing it's not in there. It's more likely a patch in the System file since they could just bake it in at this point.

That's probably a topic that requires a much more detailed tutorial of some sort, but here's a quick one: Go to File -> Import File and select the binary. While you can import the file itself, it's usually easier to export the individual resources and just get the one containing the code you...

Technically you can change it, there is a block of four jumpers on the drive's PCB and the first three are the SCSI ID.

The Conner doesn't have anything special for termination, just pull-up resistors connected to the SCSI +5V.

Since they are 8-bit chips on a 16-bit bus, the two chips will be in the same address range. The error result it gives should be the bad bits. Convert the first four characters of the result from hexadecimal to binary, and the 1s will represent bad bits, starting from bit 0 on the right.

Assuming you're on the M5120, you're currently testing 8 chips at a time. You may need to test smaller ranges. Here is a table of memory ranges for the 32 RAM chips. Note the repeating values because B through E are for the low byte and F through J for the high byte. 1 2 3 4 B 00000000 -...

If I recall correctly the Portable uses the voltage drop through the charge MOSFET to determine when the charger is connected. It compares the charger side voltage with the battery side voltage, and if the charger side is higher then the power adapter must be connected. So for example, with just...

That would be the trace connecting the 1.2V reference to pretty much everything else. Here's what I have documented for RP201:

Error 14 is unfortunately the very first test/error that you can get, so it's hard to say what else might not be working, but getting to that point means many things are working at least. Since you're not always getting that far I would suspect some sort of power issue. Start with the most...