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Just my $0.02 but I think 0.5v is a bit too low. I still think you should visit the voltage adjustment pot on R45 (or R51? I forget, google is good). You want your 12v line to be closer to 12v without your 5v line exceeding 5v. I'm not shocked that your floppy drive doesn't work great but it is...

A few thoughts, this is not medical or legal advice and should not be considered investment guidance: You are missing the checkered background on your happy mac and it makes me think there's a a RAM issue. Try with no RAM or 1 bank of RAM. You will need to adjust your resistor. You can swap...

I do a little bit of work on compact mac logic boards and found I needed a convenient way to power them up and get video without fussing with a case, so I made this adapter which allows me to use an ATX power supply and an RGBtoHDMI. Referring to the schematics for the 512k, you will see the...

Thanks for linking, @alxlab. For anyone in North America, @Drake may have a few left from his 3D printing test; they came out in amazing quality: Left is my design from Drake's 3D printer, right is the original Apple gear. The gears from Shapeways work just fine but they are not as high...

A few of members are already familiar with truth tables and reversing PAL / GAL chips. If you're among the less familiar, these are chips with several inputs and several outputs. The output is dependent on the combination of input signals to individual pins — all of which can be customized. This...

Very nice! A small bench-top injection mold machine might be sufficient in combination with a small custom mold (could be 3D printed): I've done similar small batch production for Garmin mounts using RTV silicone molds.

I can't speak for the quality of the Thingiverse you linked to, I have never printed it. But I can guarantee this one will fit perfect — I spent 5 years working on it off and on.

@dogcow would say... Here's a link to this great article he wrote about upgrading the 128k and the history of it.

It just occurs to me, if you're using a 512k logic board then @Bolkonksij may be able to use one of the compact mac video adapters I posted about recently.

I think it's amazing that Jon made the source available. I feel like, even if there isn't an immediate reaction, this sort of material has a lot of value for years to come!

RGBtoHDMI + iPad Retina display + CRT2LCD adapter

Just a frigging Mac 128k in good condition. Is that really so much to ask for? (They're really hard to get!)

I hope this means JDW will be providing translation for an English version of Doping Mac.

Nice work, Kay! Another happy mac :)

"I am _NOT_ doing another Thanksgiving dinner. I can't take this anymore! Peace out." — your oven

I love how in the span of 3 posts it goes from opposing modifications to literal sparking cutting wheel. 😅

I'm excited, I hope there's a Kay cameo — at this point he's like a mysterious shadowy figure!

Khajiit has wares... or more specifically, I work on many projects! You can find the meowTOAST on github, which also lists the meowTWOast (meowTOAST v2). The board we discussed ended up being a bit too short in the first revision — I'm not really satisfied with the idea until JLC can provide an...

I believe a CGA monitor would accept the signal but it would also depend on the frequencies supported by the individual displays.

Good find! It definitely looks like a similar in part to Larry Pina's schematic.