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It wouldn't work since the ram from a PB 1400 uses DRAM. You would need either SRAM or PSRAM. On top of that you would need to design a new RAM expansion module for the Portable. For the Portable all the logic for RAM chip selection is on the memory expansion card itself so it's more complicated...

Oh this board is really interesting since it can go to 8MB and has a MMU! Looking forward to seeing what the board looks like.

Thank you. I try my best. Hopefully someone else will find it useful. If anyone needs a pair I'll be selling them for $10 USD + shipping. Don't feel like doing a patreon thing so I'm going to try to start selling stuff to help pay for all these projects.

alxlab GitHub Repositories Power Macintosh G3 Drive Rail 922-3228 815-2734 This is the drive rail for the Power Macintosh G3 beige desktop. The Apple part number is 922-3228 and the part is marked with 815-2734. This is used for the CD drive bay and the extra hard drive or zip drive bay...

Yeah that's a given. I'm not melting it until I get my v1.1 plastic from JLCPCB

I'll make a proper post and github repot for the interrupt/reset switch back but until then here's the latest models. I updated the height slightly. I've included the 10x version of the model if someone wants to have it printed at JLCPCB. The best results was with with the MJF printing and PA12...

Yeah exactly if you don't want to do any soldering that's a good choice.

That's very interesting! I just checked my SE analog board and it has the through holes for the fan power like yours. I wonder if all the analog boards have the solder points even if they use wires.

Why did you have to make a hole? I just ran the original wires on top of the bracket like Apple did for the original squirrel cage fan and metal fan brackets.

I just committed the v1.1 of the bracket on github. Enjoys :)

From my bookmarks. I'm pretty sure I got a couple other pages bookmarked like that but I think this covers pretty much everything the other sites did. The PDF is nice too. https://web.archive.org/web/20190618105152/http://davespicks.com/writing/programming/mackeys.html

The bracket would be one piece like the current one on github. You would screw the fan into the back of the bracket and then screw the bracket onto the analog. That's it! I'll finish the model tomorrow.

It's no problem. Part of the reason of the forum is to have discussions.

Going back to this quote from the LC III dev notes: "At system startup, the boot code determines the amount of RAM installed in all banks and then sets a RAM configuration register in Sonora." I would assume if there was any activity on the address lines it would be during boot up only while...

Actually yes! A couple of days ago I fooled around with the 3d design software I use (123D Design) and found the loft feature. It was a little tricky since the fan bracket is asymmetrical. The result is this: So it would have the same transition that a duct boot would have. Think it would...

Well I'm glad it was preserved. It basically had all the information I was looking for with explanations unlike useless stuff like this from wikipedia: It's like waaa..... how did you come up with 2 to the power of 27???? If you don't mind I think I'll make a copy of that memory information...

Hey wait a second @trag! Are you the the same trag as the trag mentioned on that site? "The thread started in 2001. "trag" who is/was a "Guru Moderator", responded on date 12-08-2010, 12:15 PM, as follows." That would be quite to coincidence :D

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...