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Okay, made progress tonight and fixed my botched RAM swap. After doing a thorough pin-to-pin check I discovered that I had no continuity for the CAS pins (CAS.HI) on the G-row bank of RAM to pin-2 of the RP3 resistor array. So after fixing this, I am now back to my original issue of the "_2_0_F"...

So I'm sad to report that my RAM replacement didn't go as I had hoped and I think my logic board is toast. Although I was careful in extracting the old RAM chips, I inadvertently lifted a couple of traces off the logic board. I became aware of the issue when, instead of being greeted by the '...

Thanks for the offer unity - I haven't conceded just yet. I just ordered some replacement DRAM from Jameco, planning to start there. If the memory swap doesn't fix the issue, I'll check the shift registers and look into analog board issues.

I knew I should have taken the blue pill :)

Thanks for the replies and the suggestions guys. One thing I did forget to mention in my original post is that this occurs both with and without a disk loaded in the drive, and the error is displayed as soon as I turn on my Mac. Also, I am getting the normal power-on chime when turning on the...

I have a Macintosh 512K (M0001W) which has been sitting in storage for the last 15 years. When I last used it, I remember it working fine however when I powered it up this weekend I was greeted with the "Sad Mac" face and a partial error code as seen below. I've searched the forums here as...