Search results

@stepleton Okay, here's what I've come up with; chosen values reflect a combination of affordability and availability. Voltage Range (Amps) I (Amps) R (Ohms) P (Watts) Chosen Resistor (Ohms) Chosen Resistor (Amps) +5 4-8 5 1 25 1 25 +12 0.35-2 1 12 12 12 15 +33 0.3-0.7 0.44 75 14.52...

I cannot thank you enough for your insight - PSUs are not my specialty either, but this does a fantastic job of helping me understand more about them. I'll follow up with my math and a proposed parts list if you wouldn't mind double-checking my work. I'm recovering from hand surgery at the...

Minor follow-up. Been in touch with a fellow on Facebook who's walked me through building a PSU bench test rig. I'm having Carpal Tunnel surgery tomorrow (yay, finally getting feeling back in my right hand!), but Friday or Saturday I'll get it assembled and have an external means of testing the...

Dang - thanks for explaining that! PSUs aren't exactly my strong suit, so I'm grateful to anyone who can help me understand things a bit better. Small update of sorts as well: I recapped the PSU and checked the six main transistors. Mostly satisfied with the results, I checked everything for...

As for the PSU, it makes the familiar chirping when attempting to power on the Lisa (the I/O board is removed for cleaning, but I wanted to verify the machine would even power on first), so I've been going over everything I can think to. Using the Lisa 2 restoration thread by rdmark over at...

Alrighty - update time! First, I have a keyboard on the way, so yay! Second, I've had a chance to clean this thing up quite a bit. the I/O board pins are fine and a fiberglass brush did indeed take care of them, much to my surprise. There are some broken traces coming off of them, but none of...

Are you freakin' kidding me? Really, Apple? Lol, what an oddball approach - thank you for the explanation! The first slot's tab is broken, so I didn't want to risk the populated one without asking. I'm really hoping it's not quite as rough as it seems once I get everything pulled... and good to...

I was cruising Facebook marketplace a couple weekends ago and came across something I never thought I'd see an ad for on there: a Lisa 2. The asking price was reasonable-ish, but once I saw the description and photos of the battery area, my heart sank a bit. "Used to power on, but now no longer...

I had the same issue; X says the INC file is missing (and indeed it was in my case). My experience with X was less than favorable, so I did exactly what you did and downgraded. Had no issue after that.

Wow, you weren't kidding - Jan 2023 is the expected in-stock date at Mouser for the one I ordered originally. Glad I bought a few just in case I fried one.

Well, fudge - I was hoping it was just me, lol. Either way, having HD20 access on a Classic or SE (even if limited to one "volume") is still incredibly valuable. I can't express how grateful I am that you got this running to where it is. With the FloppyEmu potentially no longer being available...

Also, this is absolutely nuts, lol!

Okay, sorry for the delay - it was a busy weekend. :( I ran the TashTwenty through the gamut of my Macs and can add the following: your assessment and mine of the 512K line up perfectly, so we're good there I had an identical experience with System 6 and earlier on my Plus, and also found...

Good news everyone! All problems appear to be generally resolved now. The regulator (more on that below) appears to have absolutely been an issue; the flaky behavior on the Classic is gone and it recognizes and initializes cards (also more on that below) without complaint. It appears 50mA is...

Nice! That thing truly is very tiny, lol!

Yep, powered by the PICKit; after doing some research, it seems PICKit 3's are hit or miss with internal power. I may try programming another with a jerry-rigged socket that uses a solid 5v external power supply driving the PIC. I also need to test this with the 866 and have the PICKit verify...

Okay, good-ish news (but PIC steps first)! When I selected the PIC16F1825 in the MPLAB IPE, it complained about not being able to recognize the device in the PICKit. I dropped the voltage from 5v to 3.125 and it immediately recognized it. I'm entirely unsure of how that worked, as I thought the...

Hmm... then I'll probably avoid using an external supply. Out of curiosity, were there any steps getting the PIC flashed outside of just writing the HEX straight to it? Did it need any other control bits set or what have you? Just want to make sure I wrote the darn thing correctly. Grasping at...

@demik So, I did some thinking while I was looking things over (can't locate any faults, unfortunately), I got to thinking. Since I swapped out a 50mA 3.3v regulator for the original 250mA one, could that be failing to provide enough current to the SD card? If so, could I just wire up a 3.3v...

Surely! Pardon the flux. I'll try another couple of SD cards just in case. Also, I have a logic probe if that's of any value, but sadly no scope. I've been meaning to get one and learn how to use it for a while now. I'll also double-check my work on the board while I'm at it.