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(via @joshc)

If you are thinking about this as an investment, or in value terms, but asking these kinds of questions, you are going to lose money on this. Canny investors in any area are those who are ahead of the community's opinions, not behind them. From the point of view of interest, I'd suggest...

-> Thule, the period of cosmographie

An existing application? It's not very useful because 'appe's aren't allowed to have a user interface and IIRC will break if you try. It's most useful when you are building something that runs like an application (i.e. has an event loop, can get away with only running when the process manager...

Yes, it's a Molex Mini-Fit Jr. Same connector family as the ATX PSU, the SE AB-LB connector, and thousands of other things. Hopefully needless to say it doesn't have the same pinout as any of the others though - even the SE - which is just inviting trouble. As people have alluded to upthread...

Think 'daemon', not driver. Remember, the term "extension" is really "something that adds functionality but doesn't have a UI", it doesn't represent a single kind of hook or entry point. When each thing is loaded and how depends, as usual, on its type. An 'appe' is a background-only...

It needs to be 'appe' in lowercase.

You have been lucky then. RAM definitely goes bad, and increasingly so as it gets older.

Given that most memory one can get these days is old and from dubious sources, I'm always surprised how keen everyone is to disable their memory tests. They must like troubleshooting weird issues much more than I do. Yes; I mean it's cool that you can do that, but I think its actual...

It's also not actually very useful to replace the ROM. A lot of people seem to like doing it, but there's not objectively a huge amount of reason. The reason it was there was presumably so that if they found bugs after the first few batches of machines were in the field (or even in late...

Yes, @MrFahrenheit has done a great job in tracking down and making the A/UX stuff available. Pretty sure the System 7 stuff is also available on the Garden.

The Apple schematics (attached for your reference; sourced from another thread here) show the polarity:

I agree with you: I always discharge the CRT before doing this kind of thing.

Yup, that looks like your solder joints are knackered. That's good news, because you can fix that without needing to replace any parts, you just need to remove the old solder with solder wick and put some new stuff on. I don't know about video; I got this originally from The Dead Mac Scrolls -...

No rotate left? How are the mighty fallen!

A couple of thoughts: Sorry if this sounds patronising, but we all miss things: you have found the brightness knob and checked that it's not all the way down, right? If you tap the analogue board side of the case relatively firmly, do you get any flashes of image? The reason I ask (2) is...

Yes. Technology was moving fast. Much faster than now, much more radical change than now.

Why? 1992, the ARM6 macrocell was released and the ARM250 (based on ARM3) was in mass market computers. The age of the 8-bit micro was very, very dead.

Glad you worked it out! :-)

Swap the RAM sticks around: does the fault move, or stay where it is? Bad RAM can look like almost anything else is broken too. I'd suggest resolving the RAM issue before attempting any further troubleshooting on other parts of the system.