Search results

One other thing I found. I replaced the most of the ICs in the video schematics and god no change. However, I noticed on mine that the chip at H8 was labeled on the PCB as an LS04, but the schematic and the chip in my machine was an LS14. I replaced it with an LS14, but was wondering what...

Yeah. I used ADTPro on my Apple IIc+ with a Disk II attached. I wasn't sure if it was worked, but figured it was worth a try. Seems to work fine - I created the SOS ADTPro disk, as well as the Apple III Diagnostics disk and an Apple III confidence disk. Given the messed up video output...

So I used ADTPro to make an Apple /// Diagnostics disk. When it started up, I hit enter (I assume it's the first option to run the tests?). And I get this screen: So even when not in text mode, the image is not being draw correctly. It seems as though the image is broken up into parts...

I think I've read others have been replacing the header with something with higher quality ones? And in one video (), they simply tinned the headers to try to prevent future oxidation, which may be the cause of the buzzing. But I don't think the caps are the source. However, I'd replace the...

Minor update. I found some people saying their PB5xx machines run fine on 12v, and I've had the buck and boost converters getting very hot during longer use, and so I decided to see if I can just use the standard voltages supported by USB-C for the two higher ones (15v for 16v, and 20v for...

I think the challenge is that the internal battery contacts, I don’t believe, are simply able to supply voltage. I think there’s an expectation of the battery management doing things and communicating with the laptops. And, as you noted you’d have to disable the power input so you’re not...

OK, so I did confirm the III is booting. I was able to make an ADTPro SOS disk from my Apple IIc+ and booted the Apple III with it in the drive. And, I certainly can tell it is booting SOS and launching ADTPro. I can interact with the app with the arrows and it is beeping at me, so I'm...

It seems like Joe's Computer Museum is trying to specialize in the III. I ordered a cap kit, but I'm wondering if I should have added a video ROM to my order in case that is the source of my video problems.

OK, so I decided the RIFA caps are probably not in good shape to continue using. I removed them and tested and the .22uF one appears to be shot. Would that cause issue with the PSU voltage that could cause problems with the video output. I suspect the square in the bottom right that is...

Just a quick update that may give some more idea of what's happening: when I do a Open Apple-Control-Reset, the screen resets and it appears the floppy doesn't try to reload, but the interesting thing is when I start typing on the keyboard, I do see the pattern change, which makes me believe...

I just picked up an Apple III locally and it came with a ProFile 5MB Drive (unfortunately no Profile card in the machine), two Apple /// Monitors, and the external floppy drive. I need to replace the RIFA caps as the big ones are cracked significantly. However, I decided to start it up in...

FYI, I've pivoted from using the universal voltage adapter because of the size and the pain of switching voltages, and have gone to building voltage specific versions of @PotatoFi's Powerbook adapter found here: https://tinkerdifferent.com/threads/powerbook-1xx-usb-c-pd-adapter.3827/post-33386...

That’s a good option for people that haven’t already bought the trigger boards. Less work than printing a box buying a trigger board. Update: built and works very well. Since there was no buck/boost converter in the 3d printed case, I used hot glue to secure the usb trigger board on the one...

Update number 2. The new adapters that do smaller boosting of voltage seem to be working well. I'm using a 20v trigger board for the 24v and a 15v trigger board for my 16v adapter, both with boost converters.. Both ran for a good amount of time without failing / overheating. The 7.5v adapter...

I recently picked up a Performa 640CD while visiting my sister in Colorado. Pictures showed the Mac side booting fine, and the price was good, and it had the DOS compatible markings on the front! Was looking for a partner to go with my 6115 with a DOS card, so I picked it up, removed some of...

Minor update. I haven't used the adapters too extensively yet, but I did break two of my boost converters powering my PowerBook G4 (Al 12") for only about 5 minutes. I forgot this one actually has a battery that takes a charge, and I believe a combination of boosting the voltage from 15v to...

So I did a measurement and it does seem like the proportions are a bit off. a 640x400 resolution should put the screen at a 1.6:1 ratio. On my monitor, it is displaying as 1.51:1. So it is stretched vertically a bit. I suspect this could be adjusted in the software on the adapter given that...

My understanding is that it matches the 640x400 resolution of the Portable. So the black bars at the top and bottom are for the 80 pixels that aren't populated on the 640x480 output. Getting hit by the hurricane at the moment so I don't want to plug it in during sporadic power outages to...

Getting better… … back together and still working. Not sure why it refused to power on before. and here’s my little box:

Unfortunately, this will have to do for now. Took everything out and trying to remove as much as possible. Video out definitely does work, though. Apologies for the messy desk One thing I did notice when my machine was still together is that the case I printed is tight up against the back of...