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I've had fun in the past looking for old university courses that used Macs (particularly 68k assembly). I found an old physics course at UC Davis where the labs used 68k assembly to directly write to SCSI chip registers to treat the SCSI data lines as GPIOs. This was on a Mac SE booted from...

The 2400c does have a VGA port, but finding some kind of 10.4" LCD to run off it seems like an equally long shot. I've looked at Yahoo Auctions JP where there are a lot more 2400s (some for pretty cheap), but the costs seem to add up quickly for international shipping, the handling service, etc.

Yeah, just wasn't sure apm understood that the board is not gonna boot with UB11 removed. Despite being the sound chip, it is necessary.

Thanks for the info, that all makes sense. I have a Q605 and a Mystic CC, and a full 040 I want to put in one of them at some point. I just took a look at the Quadra 650 and 840AV logic boards, both with 33 MHz 040s, and they both have heatsinks.

I was under the impression that UB11 was the chip that actually drives RESET (assuming the reset button isn't being pushed). UB10 is an identical chip though, and it outputs its reset signal (on pin 5) to a test pin--maybe wiring that to the board's reset signal would be an easy test.

Really? I had a 660AV and don't remember any heatsink on the '040, and can't imagine there be much heat difference between the LC040 and 040. I also had a 6116CD and there was a small heatsink on the 601. 

Have you reseated the 68030? My socketed SE/30 just had horizontal stripes at first, and even after recapping/cleaning would still occasionally do stripes and/or reset while running. Popping the 030 out and reseating it seemed to fix the problems at last. Does the ROM Chip Select line ever go...

Yep I also used a 24-pin ATX extension cable as an SE/30 logic board extension, all I had to do was cut off some of the pins on the logic board side. The shape of the pins is a match, and the ATX extension just passes them through.

You can download the eval version of tunnel builder from tunnelbuildereval.bin, and the Internet Archive has the manual at TunnelBuilder 5.0.1 for Mac Users Guide (I'm gonna upload it to the garden also) Haven't tried it. Requires OT but otherwise works back to an '030 (although they highly...

I assume a CS card would have better performance since it's a higher-speed 32 bit bus only used on 040s and up, whereas LC PDS is 16-bit and clocked slower. I don't think a PDS card would hurt the rest of the system performance though, there's glue logic to adapt LC PDS to the faster processor bus

I think the 580 has a Comm Slot, some of the other LCs (like the 575) generally prefer CS Ethernet cards rather than LC PDS. There's some new CS cards on eBay, not sure if shipping would be $$ though: https://68kmla.org/forums/index.php?/topic/26027-ebay-finds/?p=290686

Those are for the Apple IIc, with the computer on one side of the inner divider and the AC adapter on the other.

Luckily the MacPro4,1 and up use standard DDR3 ECC DIMMs, which are way cheaper than the weird DDR2 FB-DIMMs of the early Mac Pros

Cool that'll work. I'm pretty sure you could install El Cap off a USB drive without needing anything installed on the drive, the 10.6.8 requirement is just because that was the first version with the App Store, and that's the only place to download it from.

If you have another up-to-date Mac and can download the El Capitan installer, you can make a bootable USB drive: https://support.apple.com/en-us/HT201372

What a steal--the Nehalem Mac Pros are still very desirable machines. You can install the MacPro5,1 firmware on it to use faster RAM and newer CPUs, put in 2 x six-core CPUs for fairly cheap, install SSDs, fill it with RAM, and there's a whole world of PCIe graphics cards you can use (up to...

From this thread, oldappleguy might still have a few. He sent me one, it looks great with the AppleColor 13" High-Res RGB on top of my IIci.

Yeah I was working on my Q605 this week, it is tricky getting that connector off. The black retainer arms are at least rounded off on the bottom side, so they will flex out by themselves just by pulling the PSU connector off. Having the PSU connector on that little leg on the bottom of the board...

I had a similar problem with my CC, just one corroded via prevented it from starting up at all: https://68kmla.org/forums/index.php?/topic/24740-color-classic-no-power-issue-debunked/?p=270845

I fixed it!!  :) I saw that the vias around C35 didn't look so great, and started tracing to see where they went. I found one which tested ok to the bottom of the board, but for some reason wasn't connected to its trace on the top of the board. Turns out this is the main 12.5 MHz clock...