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As would I!

@David Cook I did some L2 cache tests with my 7300 a while back that mostly match yours. I thought it was interesting to see how more L2 cache also improves disk and built-in graphics speed. L2 Cache modules tested: None, 256KB, 512KB and 1MB Spoiler, more L2 cache is generally better, but...

No, this wouldn’t be like how a BlueSCSI disk image works. Someone else might know a way but I think you’d need to install on the new disk (actually an SD card in the adapter) like how I described above if you used a real IDE spinning disk drive.

I’ve used this one in a Quadra 630: https://www.amazon.com/gp/product/B07YFPX7JB/ I don’t see a reason it wouldn’t work in a newer machine Like a 6360.

To use the IDE drive: Plug it in where you removed the disk that came with it. Download and burn a CD-ROM for a Mac OS installer (like the first link here foe 8.0: https://macintoshgarden.org/apps/macintosh-system-81-mac-os-81). This of course assume you have a computer with DVD/CD burner and...

That IDE drive would work (of course you'd need to format it which would erase the Windows 98 install). Is your BlueSCSI an internal 50 pin version? You could use that in place of the CD drive but that might make installing a new Mac OS harder ...unless you use a HDA image preloaded with an OS.

Dual PDS does seem more likely I think. Unfortunately the PDS and Cache/Accelerator connectors are identical. Pretty sure bad things happen if you plug one type of card in a slot meant for the other.

Do you have another IDE drive? You could try installing regular OS 8 or something.

Printed on the chip right? But was it running at that speed as reported via through the OS (System Profiler, etc)? The actual speed the CPU runs at is controlled by the logic board.

It looks like it, any vendor markings on the other side? What brand was the video card? I have a Supermac Dual PDS adapter that looks similar, but I guess there is a chance it could be a combo Cache/accelerator slot and PDS slot adapter. I have one of those from Daystar that looks similar too.

That seems pretty definitive that is a prototype "Alchemy" board for a 6360 or 6400. https://www.macgurus.com/products/motherboards/mbppc6400.php The fact its in a desktop case makes me think its more likely a prototype 6360, but I guess Apple could have been testing the faster 6400 series...

Wonder what the gestalt machine ID number is? Something like Tattletech should be able tell you. Not sure if there is a better list, but found this: http://www.rgaros.nl/gestalt/chapters/ch-06.html If its a prototype 6360 or 6400 I think it would be 58: gestaltPerforma6400 =...

How about the reset button? Page 268: https://www.applerepairmanuals.com/the_manuals_are_in_here/Performa_6200_6300.pdf

It was fun, except for the moment I thought it had died!

Did you pull out that old battery? might be doing funny things if still has some nominal voltage?

Another pic of the wiring in case folks are interested: At the bottom of the pic you can see the Floppy EMU 20-pin ribbon cable connector. Checking and double checking all the single pin rainbow colored jumpers was annoying but worth it.

And success! except System 6.0.8 on the Floppy EMU HD20 image won’t work with the IIvx: but the point is @tashtari was right!

Also Pin 14 is Enable2 on the 20 pin floppy cable going to the Floppy EMU, that’s what I’m jumpering to pin 19 on the SWIM chip.

Pretty sure I have it right, Enable2 is pin 19 on the SWIM chip, on the IIvx board pin 20 has a silkscreen label, I’ve connected one pin before that. Found this to double check:

Funny, right there with you. With the VRAM installed I can’t use my new micro jumper and have the power supply installed: …so after all that solder it is: