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The compact notched keyboard M0487 is a budget board, no mechanical switches, so is a bit mushy. The M0116 might be a good option with ALPS switches just like your AEKII but much narrower. Original equipment on the SE/30 and others; same key layout as M0487).

Ohm’s law tells you current = voltage / resistance, so current = 5 / 180 = about 28mA. Normal for an old LED. Changing R111 to be a 470 or even 680 would probably be a good usable value for a modern power LED, the last thing you want is maximum brightness! You can avoid desoldering anything on...

Having a voltage rating that is too high is never bad, it just has to be enough. It’s like using 14 gauge wire for a LED that will see 3V at 10mA. While the measurable resistance of that wire might be very slightly better than a 30 gauge length of wire you won’t really see a change. When I...

As long as your physical size is OK, and you don’t substantially worsen parameters like ESR, using capacitors that are well overrated for voltage is not a bad thing at all. Sometimes you might even find they are cheaper if they are a more common part than the lower just-good-enough one.

Nice thorough video! 

Nice job! how do you find 640x480 on that size screen, does that sharpness of the LCD make up for smaller text?   If you want to have the Mac splash on the screen earlier even a very cheap FPGA could do this. You don’t need to care about memory for a screen buffer because you could generate...

The sound I played is the ascending tones that happen when you press the programmer's switch button. I'm a bit limited in what I can do because I do not have a booting system set up at all at the moment. I took measurements from the positive side of C3 and C4 - sorry but I'm not going to get the...

I do have my SE/30 out of its case because I am doing some hardware things, when it is in the chassis you can’t access much. To keep it safe I made a 3D printed base with power supply mounted on one side. Because I have all the connectors handy I made a cable from a Mean Well +5/+12/-12 supply...

Would a SE/30 with an internal color display (and connection for an external) be the ultimate compact Mac? I think so. The only 68k Mac I'd rather have is a IIfx. As things are I too have looked for a Color Classic but the prices they fetch are ridiculous - at least double and maybe triple the...

I've been powering a SE/30 board from a power supply that has 5V, 12V and -12V. I simply left it disconnected and no issues. So far on the schematics the only place I can see it used is Vee on UE12, a 26LS30 line driver. Serial communications. Is that the only place it is used?

Good thread JDW. What I hate most about buying capacitors is when you think you have the perfect cap picked and fill the cart only to find that one value you need isn't made in that range, or worse it is out of stock with a 10 week lead time. Since I have just found another SE/30 I'll be buying...

I have the Astec and the ground wire is definitely present. Any chance the switching function of the headphone jack has become sticky and the machine always detects a jack inserted? If you remove the headphone jack and test that might tell you.

That's really looking good.

With the scope on the capacitors I see peaks at 12V, such as when pressing S2 (ascending tones). I haven't got a system installed that can play a continuous sound right now I'm afraid. 5V is the baseline.

My SE/30 board is living in an external development setup right now. I was able to measure 5V on C3, C4, and C5.

I did try the hacked HD SC Setup and it did not succeed. I found that Lido 7 (should be on your BMOW Floppy Emu flash card, if you bought it, or try Macintosh Garden) made a reliable SCSI image on which to install the floppy images. I also found that a SCSISD solid state SCSI drive was a...

Like this? Yes it's ugly in red, but I've been iterating on the shape to make it a great fit so I've been using up the plastic I don't mind wasting. I'm working on a solution to make the LCD a direct replacement for the CRT. Fortunately/unfortunately I'm about to take a 3-week holiday but...

The other thing I notice about that board is that half the SIMM sockets look like mine, black in color, the other half are white plastic. Surely the factory didn't have a mixed bucket and randomly picked up two different ones? Maybe if you flipped that board over you would find some evidence of...

Being in Australia I can understand the higher prices, but that seems like an awful lot for a Mac that isn't working perfectly. Are you able to get pictures of the inside? That could at least tell you if you have an exploded battery or perhaps just old caps that need replacing.

It can work but it is not going to be great as a Linux machine. For one the CRT is old and you will probably have to recap the analog board and power supply and you might also want to align the CRT. Also there are a lot of high voltages on that board that make it less desirable to keep around in...