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In this example the new 6v fits exactly in the empty old casing leaving some space at the ends. Connecting wires to the original metal clips makes it quick and simple. Be careful for short circuit while working on it :) . In the battery case everything is held in place by good double sided...

Schematics are superb.

Thanks so much!

I am restoring a Macintosh Portable 5120 (original) and have send the board to a technician who will recap the board. He sees resistor R21 looks bad too and measures an infinite value. He does not know what the value should be, can't read it anymore.  Could someone have a look at R21 and tell...

Using the Floppy Emu the Portable can boot from any image 6.0.4 and up to 7.5.5. But not an HD20 boot image. 

How about connecting a Floppy Emu to the second floppy connector? Simple and flexible.