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@Volvo242GT Just an FYI, but if you or any of our fellow HP calculator lovers want to research a log of great calculator info, check out the HP Museum forum here: https://www.hpmuseum.org/forum/ That's not to say we can't or shouldn't talk about them here. I just link to that forum because...

The site is working today, but even though I have the site set to the Japan region (where I live), I am getting the same message... That indicates it may not be sold anywhere, which is very odd. Swapping out the caps is going to take time because the ones in my cart originally were the best...

Solder joins for these two components look "factory" done... But these solder joints look either compromised or someone desoldered them and resoldered without flux... The problem is that there is no Schematic for the CC Analog Board, so problem (burned) components need to be traced by hand...

Very interesting. Thank you for the photos. Certainly looks like DP6 and RP15 have been compromised due to heat. But resistors RP23 and RP8 are raised up off the board, and yet the board directly under them is charred. Very odd. Not sure if he'll reply, but I'd like to ask @techknight if...

I've never touched those on my board. Maybe if you could share some clear photos of that area, I could better comment about them. Maybe they are just dirty and not burned. Put some IPA on a tissue and wipe them to see if the grime comes off. If it doesn't wipe off, they may have burned. But...

Professor Lund, Great to see you posting here on TinkerDifferent! I was trying to swap out capacitors in my two Carts after reading your post, but suddenly the entire website shutdown... I guess I will need to wait until tomorrow. Tariffs have wreaked havoc across all my Mouser Carts, I...

@TechnikTobi Welcome to TinkerDifferent! Congrats on doing the Beefy Component Upgrade and for heat sinking your DO-201 Zener Diode! I enjoyed looking at your photos. Should be interesting to see how long the superglue holds that heatshrink atop those heatsinks. Anyway, I'm glad you used...

A fellow HP calculator fan! You might find my calculator collection of interest... https://www.flickr.com/photos/66071596@N00/albums/72157699805228815/ My 48GX, in particular, is somewhat unique in that it has a 128KB FRAM card inside which requires no battery. Useful for installing Meta...

Bless you, friend! Please let me know your Paypal donation account so I and others can say a little thank you for your kindness to the community! Correct. Here's a short video (no sound) that shows one of my rusty HDD drive bracket, showing it from all sides... At the 6 second mark you can...

Watch my video from 3:13 to 4:08 for all the details on that component:

Those are large solder pads under the power switch, and to better reflow mine, I used a soldering iron just after heating the area with a hot air station. I used flux to better ensure good solder flow. Very well could be that even if you've desoldered before. Also note there is one extremely...

While I certainly appreciate the positive encouragement, I'll stick to filming YouTube videos in top quality 4K. That's what I do best. :-) I simply enjoy filming the 3D prints made at JLC from the STL-creating geniuses out there. Working on a new video now, in fact. Some of the 3D prints...

@frontein1 To supplement my previous post (you may wish to re-read that because I added edits to it throughout the day yesterday), I have even more info for you. @phipli offers his C SOURCE CODE here: https://github.com/Phipli/Soft-475-Overclock/blob/main/Extension%20MacBinary/INIT.c.bin It...

Whether a painted stock case or 3D printed, I took note of the bottom "lip" of the floppy slot having been perfectly filed down at an angle... @jmacz we need full resolution pics! :p That one thing being a 3D printable DRIVE BAY for any 3.5" drive, be that spinning platter type, MacSD...

Now that you mention the clear case, a bracket printed into 100% transparent resin would look better than Velcro. :-)

60ns Yes. See the 4th page of the attached PDF schematic of the LC575 motherboard. 475 Overclock Software by @phipli requires MEMCjr to do its magic. You can download the MEMCjr datasheets here...

To @Drake and whomever else might know... Does the resistor overclock mod increase the clock speed of the CPU and the FPU too? And does it boost the BUS SPEED? I'm just curious if the resistor mod transforms the LC520 board into an LC550 board, which of course means CPU, FPU and BUS Speed...

@wottle Thank you for replying, but I was afraid of that. So many brackets use that expansion port, but that doesn't work for a Mac SD, and my middle name is "PDSCARD" so I have the need to mount it in a bracket directly above the floppy drive. I could just hack off the back end of the stock...

Does the eery silence mean none of you know? 😨

I've got the v092 firmware flashed to my Universal ROM SIMM in my LC575 motherboard (Color Classic Mystic). Booting into System 7.1, I see I only have 32MB RAM now instead of 36MB, which is expected. I am using the Soft 475 Overclock by @phipli to overclock my 040 CPU, but I am not seeing any...