Interesting, does your original,, first year DrexelMac have the diffuser or just the holes? My Branded DrexelMac doesn't appear to have the holes. Is the 512k/ke front bezel indistinguishable from the 128k's? Mine may well have started life as a FatMac before its Plus upgrade and accelerator installation?Remember, the early 128ks had a "heat diffuser" along the top of the sweep board. There was a soft-recall where it was removed when a Mac went in for service because it was causing failures of the sweep boards by trapping heat. I am pretty sure that diffuser is also a relic of the deign with no vents . . . The second revision 128k (no, not the boded 128k) did not even have it installed, just the holes on the board remained.
Interesting points about the rear chamfer vents.So I can just imagine what having no vents was causing to the boards! It would also explain why the rearward vents never had a proper finish. Look at any 128k, even the ones in this thread, and you can see the vents changed in size and the mold has casting marks that were never properly polished up from that change. They were narrowed to match the top vent inserts because the top ones could not be as wide due to the case design. So rear vents narrowed to match better with the new top vents. Being a rouge unit, I dont think the original Mac really went though as much testing like machines of today do. And with Jobs so set on his ways I can see his distain for vents as it would detract from the look.
A bunch of photos in the User's Guide show people using Twiggy Macs. Look carefully and you can see the larger 5.25" opening.Hi All,
I am very puzzled here. Everyone take a look at the picture here of the guy in the class room that shows the rear of an Original Macintosh from the User Manual [...]
Notice anything strange? There is no large product product label on the back. Now, all of the other photos in the book that show the rear, have the label on the back. There is also something more strange.
This is the official Apple Service method to open a compact Mac case.I won't give advise one way or the other on this given its a prototype shell, but I never use case splitters because they often scratch/nick the interface between the two haves. I wont even buy a Mac if its chewed up like that. I always lay face down and do the slap on the side as I lift technique and let the weight of the CRT/internals anchor the faceplate down as the bucket pops off.