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Maybe this is technological masochism on my part, but one of my first experiments after BeOS would be to try Debian 8 (Jessie) on the Quad 604.  The thought of something that modern on what's essentially a 20 year old high end workstation makes me giddy.  Maybe NetBSD too........

The single horizontal line issue is typically caused by a failed chip on the analog board as detailed in The Dead Mac Scrolls: https://archive.org/details/mac_The_Dead_Mac_Scrolls_1992/page/n163 and shamada's Repair Mac...

Whoops I'm wrong!  The 5xx series CPU daughtercards use a 4x frequency multiplier IC between the oscillator and CPU.  This means that a 12.5MHz oscillator's clock is multiplied x4 to 50MHz for the CPU's external clock input, running the CPU at 25MHz. I would still aim for 33MHz for stability's...

If you can find a genuine MC68040FE40A, then that might be a good option. The 68040 series operates at half the frequency of its input clock. That means a 20MHz oscillator would run the CPU and bus at only 10MHz.  In the case of the 520c, a 50MHz oscillator is used to set the 68LC040 and its...

I'm not aware of an IOXperts Airport Extreme driver for OS 9.  I am familiar with their driver that allows use of "unsupported" 3rd-party PC Card WiFi cards in Mac OS 9 and X though.  I was going to refer you to their website as I bought said driver from them a few years ago, but I see their...

Looks like the kits are discounted to $24.99 US now, LCD not included.  See realmacmods.com

In case you're not already aware, you can get an adapter board from realmacmods that allows use of a non-Apple replacement panel in your 17" iMac, including a higher resolution 1680x1050 or 1920x1200 panel.  I bought a kit that included plastic mounting rails/adapters from them.  I sourced a...

For anybody in the Pacific Northwest, Seattle RePC has a couple large totes full of external ZIP drives.  Most are parallel, but there were quite a few SCSI units as well.  I briefly considered a 250MB external SCSI, but I realized I wouldn't have room in my luggage for the flight home.  I did...

I've had saved searches on eBay for "PowerBook 1400 CD-ROM" along with all of the relevant Apple part numbers for a few months and it finally paid off.  I managed to score a brand new in box 8x unit and it works great.  When I opened the box, it clearly was brand new.  The drive was still sealed...

The tray loading (233-333MHz) and slot loading (350-700MHz) iMac G3 logic boards are a completely different shape and size, with different electrical and cooling requirements, different monitor connections, so swapping from one family to the other isn't very practical. Some slot loading logic...

EvilCapitalist's suggestion is a good one. If the drive powers up without anthing on its IDE connector, it's probably a jumper setting. If it doesn't, your power brick may be failing. I've had some of those fail before. One would spin up some drives, but not others due to differences in...

You're right. All 601s used in Macs were manufactured by IBM. There were some 601s with a Motorola logo on them, but those were actually IBM manufactured as far as I can tell.

If the FireWire extensions avenue doesn't lead to a solution, I'd be inclined to suspect a problem with the drive. Does the drive show up in Apple System Profiler? If so, it's probably a hardware issue, not software. Usually, FireWire-attached optical drives will read discs as long as the...

I haven't had any issues formatting and writing HD (High Density/1.4/1.44MB) floppies in the versions of Mac OS you've listed with a USB floppy drive. If the drive can read and write MS-DOS formatted HD disks, it can read and write HFS (Mac OS Standard) HD disks in 9.2.2 or 10.4.x. Make sure...

The PowerPC architecture is a product of the "AIM Alliance" whose members were Apple, IBM, and Motorola. Some generations and variations of PowerPC processors found in Macs were manufactured by both IBM and Motorola, while some were only manufactured by one or the other. PowerPC G4 (PPC 74xx)...

Do you have "FireWire Enabler" and "FireWire Support" in your Extensions folder?

QuickTime 4.0.3 is the last 68k version. It requires System 7.1.1 or later, a 68020 or higher, and at least 8MiB of RAM. QuickTime typically uses its own container file format for movies. The file type code is "MooV" and can have the extension ".mov" for cross-platform compatibility. These...

Great work! Thanks for showing your progress in so much detail.

Sounds like you've done the lion's share of troubleshooting so far-- the only thing I wonder about is missing or bent contacts on the SIMM slot. I've encountered four or five bent fingers on a SIMM slot before, and I was able to gently straighten them and get it functioning again. I suspect...

That does seem like a drive issue to me, particularly if it's doing this with commercially pressed CDs and not just CD-R/RWs. Here are Toshiba's product specs for the drive, which might as well be a service manual for all the information provided. If you want to troubleshoot any further, it...