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I’ve never heard of any problems with 68k Motorola chips with XC prefixes. I think most of the ones Apple shipped were labelled XC, since the validation process could take quite some years.

They said that it would take 1 trillion years at current rates, but because the rate keeps changing it would take forever.

Oh, I should probably do this. The PSU is isolated from the case because it’s on a 3D printed stand-off.

😂 😂

That your upload helped, or that the finding is useful? :) In general, have we figured out how the ratio selection works? I’m guessing it would be possible to create a utility that calculates code for the EEPROM with options for cache size and ratio at a given clock speed.

Thank you for providing these, I used the Wallstreet EEPROM on my heavily modded iMac/233 CPU board so it would recognise the full 1MB cache I'd soldered on. Note the following findings for cache ratios: CPU Speed (MHz) Bus Speed (MHz)Cache Ratio 300662:1 3001003:2 (see photo) 3501002:1

Here's my finished PSU rebuilt – tested and perfectly working. it's amazing how, presumably just by coincidence, these Mean Well units feel like they're almost perfectly designed for the LC PSU housings. With thanks to @Yodd for sharing their excellent mounting plate design, which I got printed...

Quick tip when rebuilding a Dyna Comp, keep the heatsink/bracket from the original PCB, shorten it and reuse it so that the top cover can screw in on both ends.

This is what @Phipli meant when he said PCI USB Option.

The HD sounds like a Quantum with stuck heads due to a sticky bumper.

Omg so jelly

You’re bonkers! You’re off your rocker!

It would be the same 33MHz CPU bus as on a PowerBook 5300, 1400 or Duo 2300. So RAM and ROM access should be identical clock for clock. According to the Dev Notes for these models the 16-bit ‘030 peripheral bus runs slower on the 500 series (16MHz) vs on the PB190 or the above mentioned PPCs...

Although I don't have much interest in running PPC on a Blackbird, seeing 8.5+ on one always seems so exotic. Why not try 9.0.4? I'd be interested to see some benchmarks with Norton System Info 3.2, I guess performance is going to be even less than a PB5300/100 considering the 16MHz peripheral...

I didn’t realise that some 540c’s come with Hosiden panels, it’s a bit like the Elite LTE 4/75CX I have @3lectr1cPPC

If that’s true then what’s the point of the battery?

Nope

Yes

Yeah the first one looks like the kind of cable that I used to hook up a US Robotics external modem to my Mac back in the day.