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840AV has the loop as well

Have checked this yesterday while I had my case open and the jumper makes no difference, it IDs as an 840AV (ID 78) either way. Curious.

Yeah, I’m starting to accept that maybe my board just isn’t capable of stable 166MHz operation. What’s good, is that once R676 is removed from underneath the board, you can manage the setting from the CPU card itself. I’ll get to it. What would the SPD info help us establish?

Yeah I think it's a bit of a silicon lottery with the Pratt. I've got one overclocked to 40MHz that's basically stable, but it will eventually fall down after repeated MacBench graphics tests. Probably gets too hot. I think the 33MHz memory timings are too tight at 40MHz but unfortunately...

How about testing an 18.432MHz oscillator for 36.8MHz operation?

Need to see the About this Macintosh box showing proof of 48MB ;)

A note to anyone trying this mod, make sure to check how the banks on your donor RAM card are arranged as not all of them have four chips connected in a line. Some (e.g. Viking cards), have a different layout.

Oh well done. On that one where I fixed the two corner pins it was easier as there was more access, but I don't think I could have achieved an inline pin. I tried to repair a couple more chips after the one I sent you and I botched them both, it's very difficult to not cut too much ceramic away...

Just need to get the 8200 now and the collection will be complete 😂

Are you going to attempt to repair the missing pin on that 040? I'll be very impressed if you do.

Thank you for this.

You've done the community a solid by taking on that LaserWriter. There can't be many around. Hope you can fix it!

Is it possibly that the connector is a bit corroded and works intermittently? This happened on my 840AV until I cleaned it up. Not aware of a contact closure on the case itself.

Oh!

It’s boned.

Would you be able to share the top side as well?

Nice one, @s_pupp and that's definitely a stock 166MHz board (not a modified 133?)

Good work and you deserve a rest after that!

How do I get into OF from another machine without a serial port on the MDD? Or is there a way to save OF output to disk?

Yes, my card has S-Video out. My switch doesn’t have any silkscreen labelling to indicate what the switch does. But the photo of an R9000 from the Mac Elite does: Looks like the lower switch is PAL/NTSC, while the upper switch is the Mac/PC toggle. Not sure what SF and MF stand for but I...