I just managed to get D11E4 installed on my 7500. I replaced the G3 accelerator with a 150Mhz 604, initialized the hard disk with the version of Drive Setup that came with Copland (not necessary but I figured I'd do it anyway) and installed a fresh copy of 7.5.3 followed by D11E4.

Holding down Caps Lock it booted to the animated MacOS logo (very cool) and then hung to "Microkernel initialization starting...". So I hooked up my Classic II with the PowerMac Debugger (I could have used my 5400 but where's the fun in that) and tried again. The debugger came up with "Access Fault" and "No kernel stacks available!". Flummoxed for a bit I had a think and concluded that "stacks" sounded an awful lot like it was having a problem allocating memory. I had 96MB in the 7500 so I pulled out the 64Mb chip and tried again with 32MB. And this time it booted right up. It's still pretty crash-happy (and using a 68k machine with 4MB RAM with VM enabled for debugging is really not a great idea) but here's a few pics to get started. I'll switch to the 5400 tomorrow and see how many other snaps I can get.

The Setup

Ready to Install

Microkernel Booting

Apple Menu (pretty empty)

Processes

Chooser (note the OT icon)

Houston, we have a...

To somebody, this may actually mean something