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These old 400K drives don’t have switches. They use optical sensors as seen in post #9 above. I think this fault (of detecting a disk when there is none) can be an IWM chip fault. I’m having the same difficulty with a Portable (Backlit) and have solved it by replacing the SWIM chip (later...

Yep, I’m impressed too! It’s a long thread now, this one, and while I’ve tried to read everything, I’m sorry, I’ve lost track of which cells you’re using in your 200-minute battery - could you tell us again, please? :) I found my store-branded 2400mAh AA cells couldn’t handle the 1A charge rate...

I just wanted to say - thanks for documenting this, it hadn’t crossed my mind that the IIcx I’m working on would have a bad ROM - I’m going to borrow the ROM SIMM from a IIfx to test. I’m particularly impressed that you went to the trouble of desoldering and reading out the ROMs!

Cheers Chris, I got confused with the numbers on them :) I finally managed yesterday to get a IIcx board to power on; in my case it was traces visible near the + silkscreen marks for C8 and C9. Those traces are very thin and if they look bad, they sometimes are. I think you could possibly...

The capacitors C15 and C16 seem to be two different values on yours, Chris? I thought they were both 10uF.

I think to measure actual capacity, you have to run it right down using Amnesia, then plug in the power. It must then charge right up, after which you can restart and see the reported capacity in EMMPathy.

Does EMMPathy report the 2A charge rate? That seems too high to me, but it’s good that you’ve found cells that can handle it. What is your measured capacity in EMMPathy after a full discharge/recharge? I would find it inspiring if you’re getting over the 1752mAh default capacity, I can’t seem to...

Hello - yes, that was the case :) To summarise my experience in the months since, the problem I ran into was finding cells that can cope with the charge rate without deteriorating. I was using tabbed AA cells in blue wrap, labelled ‘XH NiMH 2600mAh’, bought from AliExpress. After just a few...

Thanks for the suggestions - I tried booting without extensions, didn’t change it. It can stay the way it is, there’s a IIci and a IIcx next on the fix-it list (for the same owner) and we’ll just consider it a quirk of that Quadra that doesn’t need fixing :)

Hello all, I’ve searched far and wide but not found anyone with what I’m seeing, nor have I ever seen it on other Macs before… This particular Macintosh (that I was using to test a monitor) has a green-tinged menu bar, as you can see in the photo. I suppose you could say it’s yellow. I tried...

I don’t think I have. I tried opening the potentiometer and cleaning it. I wonder if cleaning the CRT pins also helped. I will look again next week as I still have one or two Plus machines lying around.

Not that it helps, but I received two batteries from the USA at long last, from a friend visiting me in NZ. These batteries came with two 520c machines that I bought off eBay but - in a long and convoluted story - couldn’t be sent to me because of the batteries, so I had them sent to my friend...

Oh - lol, absolutely agree - I didn’t mean a prefabricated holder, I meant to design spaces for the cells into the 3D-printed part, with terminal plates or - as I use - CAT5 wires stripped and threaded through holes to make contact. Non-tabbed cells are a lot cheaper and easier to get here than...

Ahh you beat me to it, I’ve been looking forward to trying that :D well done! Now we just have to design the battery holders within the casing. So, two groups of five 2500mAh cells in parallel. I’m a little surprised as I couldn’t get a 100 to run on five cells (needed six - 7.2V) but the 100...

Amazing - thanks for providing the link. Hard to believe the monitor/analog board was capable of handling an increased resolution/increased frequency all along! Back at that time, it would really have helped, as some newer software assumed a 640x480 display. I guess that Apple had strict rules...

This is a really good idea - well done! :) Many of the original switches seem to have corroded contacts from battery leakage. I hadn’t found that switch size.

I’m in NZ and I’ve been working on something similar, I use 3D-printing to solve lots of problems like this. I made a battery for the Powerbook 100 that uses CAT5-wires (the stripped wires from the cable) to thread through holes in springy parts of the design. So, you can join the dots on what I...

Cheesestraws is absolutely right - I do the wash in hot soapy water (with dishwashing liquid) first, scrubbing with a toothbrush, and then after blow-drying, I use IPA to rinse. I haven’t had any problems with speakers or flybacks - I’m just careful not to touch the speaker when it’s wet. When...

Yes - replacing the SWIM chip restored the correct operation of the floppy drive in the backlit Portable that I was working on :)

I replaced the 6522 twice more, using chips taken from old 512K boards that don’t work for other reasons. I’ve installed a 40-pin socket so the 6522 is easy to swap. Both of the older 6522s produce a new result - the startup tone sounds (yay!), and then the screen is blank (boo!). Floppy drive...