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Getting some annoying coil whine from a freshly recapped 3400c. I believe it's coming from a 10µH inductor on the main board under the DC power board. I'm thinking this is a known design flaw? Is that the reason for the weird foam insulator around it? Can anybody confirm?

Hey all. Is there a way I can limit what color modes are selectable in the Monitors control panel and the Control Strip under system 7.x? Specifically, I would like to remove the option of “thousands of colors”. Basically, I would like to prevent accidental selection of this mode since it...

Hey, just checking, any reason why the 5300ce LCD cap is so huge? Wondering if it’s safe to replace with a tiny tantalum. Here a pic for reference (tant on the left, original on the right).

I just completed a full restore of a PB190cs, only to realize that, apparently, it's the ONLY(?) 68k machine that doesn't support system 7.1. Or is there a way to make it work? I checked the System Enabler docs but I don't see a supported version.

Hey all. I'm hoping someone can help me. I acquired a Mac IIx, did the standard recap and repaired some traces, pretty standard work. However, the NUBUS is not working. The machine is otherwise healthy, boots to floppy and SCSI, responds to ADB, etc. I checked traces and everything seems...

Hey all, One of my 8.24 GCs has this odd behavior. In black and white mode, it has these faint blue vertical lines. They disappear when I use higher color modes. Any idea how to troubleshoot this? I don't see any physical damage and most of the components look fine. I tried reflowing the...

Correct me if I'm wrong. With most/all other "high-end" cards, QuickDraw acceleration doesn't kick in until 16 or 24 bit color depth. But because of the unique architecture of the Apple 8.24 GC, it provided acceleration regardless of the bit depth. I remember seeing some benchmarks a few...

Hey folks, Today I decided to "downgrade" my color classic to standard resolution. It was impractical for my aging eyes. My CC was modded using the ribbon cable, so I purchased another stock harness, thinking that would do it. Looks like it worked in terms of resolution, but now my picture...

Hey all. I recently acquired an Interware Booster "6454" (G3 400Mhz/1MB) for my new PM5500. It works great and provides about 4 times the performance over the original 250Mhz 603e. The weird thing is, when you first boot the machine, it gets to the part when it starts loading extensions, but...

Hi all, I'm experiencing a weird issue. When I plug in a my BlueSCSI DB25 drive to the external SCSI connector, the machine hangs on boot. Happy chime, but no icon, just a mouse pointer. I have 2 logic boards actually, one from the PM5500, which is completely recapped and one from a 6500...

Hey folks, I recently grabbed a MAXPower G3 500Mhz card for my MP 8500 to replace my 400Mhz Sonnet (cuz why not? :)). The issue I'm facing is that when I drag windows around etc, they leave little outlines and dots around. The menu bars also have some color distortion that gets worse any time...

Does anybody know why Apple used different solder mask coating variations for the same boards? I've seen that on multiple boards. For example, I have 2 identical LC II boards, one is glossy "bright green", the other is matte "muted yellowish green". I saw the same with other boards such as PM...

Hi. I've been experimenting with my Mac SE accelerators, and apparently you can upgrade at least some of them. I haven't tried any others, but I was able to bump the speed on my Novy ImagePro by replacing the processor, FPU, and the crystal oscillator (from 25Mhz to 33Mhz). This was...

Hey folks. Trying to buy an Emac on Facebook but the seller says imported and runs on 230v. Apparently it says 230v on the bottom. I would think it has a switching power supply so the writing doesn’t matter and it should work in the USA??

Hey y’all. I am having problems getting QuickDraw acceleration to work on a Radius Thunder GX IV. The card works fine, but it appears that the QuickDraw acceleration is always off. I got the QuickColor 3.3 control panel which appears to have an option to enable/disable the acceleration, but...

Hi. Does anybody know if the 16Mhz MicroMac MultiSpeed accelerator can be upgraded to a faster version? Looks like they came in 16, 25, and 32Mhz versions. Does anybody know if it would be just a straight crystal/CPU swap? Or is there more to it than that? I assume the 25Mhz version...

Hi. Today I tried to get my Turbo 040 working in my OG Mac II. I get a happy chime, then nothing. No video, no drives searching, nothing. Not sure where to go from here. I tried reseating the adapter, and swapping ram. I assume happy chime means the processor checks out? Any advice on...

Hello, I recently acquired a pristine condition Macintosh II with a Rev A board. Upon inspection, it has both the SuperDrive upgrade (ROMs and SWIM) as well as the PMMU upgrade. It also already has a SuperDrive installed. The machine currently only has 5mb RAM installed, so I’d like to bump...