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I think these two pages were pretty good to give some insight into how SIMMs are wired and work: https://www.cs.umd.edu/users/meesh/cmsc411/website/projects/ramguide/system/Web.htm#What%20is%20main%20memory https://www.pjrc.com/tech/mp3/simm/datasheet.html

I found a great webpage that I think answers all the questions I had regarding the wiring of 30-pin and 72-pin simms in a clear way: https://www.retrotechnology.com/herbs_stuff/mac_banked_mem.txt Part of the confusion I had was the from my loose definition of bank which I saw sometimes used...

This might be a dumb question since my visualization of how 72-pin simm slots are wired is not very clear, but is there any way to modify the existing slot to make it so a 128MB simm would be recognized as 64MB? From what I understand 1 of the address lines is missing so that already cuts the...

If you guys want I could ask Chris at Memory Masters if he can make more 128MB 72-pin 5V FPM simms so you don't have to do all these crazy back flips to get a higher capacity 72-pin memory stick.

I might of missed the answer to this while going through all the replies, but yeah, can't we just hook up the two lines to the existing 72-pin simm socket?

It's an interesting question to ask how hot the CPUs in a compact Macintosh are actually running at. The standard model 68000 seem to be rated for 0C - 70C and I'm assuming the 68000 in the Macintosh SE is running within that constraint. Regardless it would be interesting to see an actual...

That's interesting since the spec sheet seems to imply the hsync goes nowhere near the frequency of the compact macs. Guess it goes to show you that it doesn't hurt to try and see if a screen will work. Maybe any LCD wit the Pixelworks PW172 will work with a compact Mac then. My newer HP...

Forgot to ask what's the model of the LCD monitor? Sounds like it would be a useful monitor to have around.

Did heat cause this?

The attitude I took when designing it was to make it at least as good as the original part (the metal bracket) while also making it easy to print with an FDM printer without supports. I also wanted it to be easy to install the fan with to provided mounting screws of the fan without having to buy...

Well the Hmm I'm not sure if it's just mechanical. They could have used a lot less metal to accomplish the same mechanical strength were the screws fasten the board to the metal frame which in turn would reduce costs. I don't think it would be unreasonable to suggest they were trying to also...

The Macintosh cases are plastic but they use a conductive paint on the inside to accomplish the same shielding as a metal case. You can test this with a multimeter on continuity mode and touching the grey paint inside a Mac case.

Went down the rabbit hole a bit: https://resources.pcb.cadence.com/blog/2021-effective-chassis-grounding-techniques https://www.eevblog.com/forum/beginners/signal-ground-vs-chassis-ground-should-they-be-coupled/ https://www.celectronics.com/pdf/IEEE11-9-05.pdf So from what I read it could be...

For me personally, my view of the SMD version of the board would be to have it pre assemble at the PCB manufacturer to reduce time and cost. With JLCPCB assembly service it would be cheaper with them than buying the parts from Mouser or DigiKey. Mind you the footprint used for the SMD...

It's funny you mention that.... I actually just did the model for exact replica of that after I accidentally melted a switch. @Kay K.M.Mods surprised me with the part number of the original switch which happens to still be in production SKHCBHA010. I actually placed several orders with...

Regarding the filters in particular, it would take someone to step up to actually take the trouble to sell these. This means breaking the panels into individual pcbs, cutting the 2.54mm pitch headers (if needed), packaging and shipping. I was thinking that maybe $1 - $1.50 CAD would make sense...

Yeah, end up with quite a few if you want to decrease the cost of each individual filters. I basically kept all the filters as spares and to possibly sell some in the future. If you're interested I could sell you some. Not exactly sure what the postal situation from Canada to Japan is at this...

Hey @mg.man I never got around to making a modified version of the extender. @Drake made a modified version with an audio jack but I'm not exactly sure how that turned out.

Yeah that computer looks like it was meant to be from the factory. Amazing! Mac SE/666

Think the PicoVGA lib would be of any use?