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Case Front
Case, Rear
Open Case
77 5.25" Drive Bay Guides
Remove Guides
Guide FRUs
Original 5.25" Drive Rail
5.25" 77 Drive Rail Hack
9577 Drive Slide
9577 Air Baffle for Fixed Disk Drive Bay 4C
Air Baffle Pasteboard Hack
Case Front (40, 57 similar) Multimedia Model shown
Case Rear (57SX shown)
Open Case
- Have front facing away
- Unscrew both thumbscrews
- "Slap" the top of the case forward using your palms along the sides of the case.
- When the top of the case moves forward an inch and a half, pull up.
77 5.25" Drive Bay Guides
Post Notches on the reverse that fit into
the drive bay walls.
Latch Locks the guide onto the drive bay
wall.
To remove Guides
Press in the latch on the guide (rear of the drive bay) and push the guide
forward.
Guide FRUs
These are mirror images of each other, one for the left side, the other for
the right side. If you make your own guide rails, you can cut the back end of
the rail square, so it wouldn't matter if you used the same FRU on both sides
The cutout for the gude's latches will allow you to switch the guides to the
other side and they will work.
96F7371 (Black) Left Guide
96F7372 (Ivory) Right Guide
Original 77 5.25" Drive Rail
This was "fun". On this rail, the screw hole marked "R" was the fixed hole,
and it serves as the reference point for the important surfaces. Note that the
center-to-center distance is 3.115". Measured that from a drive. One hole is
usually slotted so there can be some variation between mounting screw locations
on drives.
Also, with any measurement, a few thousandths here and there doesn't
matter.
5.25" 77 Drive Rail Hack
Get the ubiquitous 5.25" AT Drive Rail. Cut to fit. Note the web sticking
down at the end of the guide (.469"). This web has two functions - first,
limiting the 5.25" device to the proper depth. Second, it prevents upside-down
installation of a drive if you use the original drive rails with the matching
extensions that fit the .469" rear.
I used a paper cutter to whack the rails off to length. Use what makes you
feel good - hacksaw, sabresaw, vertical mill, ESP... You can cut the rear end
off flush- that "horn" is (as noted) to keep the drive "upright".
Fixed Disk Bay 4C Drive Slide
96F7775, 71G5706, 71G5708, 79F3300
Seems this is a little long for OAL for it to fit into the Model 90's lower
drive bay.
9577 Air Baffle for Fixed Disk Bay 4C FRU 92F0251
The older 8557 and 9557 used a grey colored baffle, same FRU.
This was used in older systems with hot running drives in 4C. Modern 1" high
drives should run cool enough without it, but if you want to run a 7,200RPM (or
higher) drive in your 77, you MIGHT want to help cool it as much as
possible.
Pasteboard hack
I built a baffle for a 9577 that went from the top air grill on the power
supply over to the D: drive bay above the control module. Worked fine. A little
duct tape, some pasteboard, and shazzam! I don't have a 77 anymore to give you
dimensions.
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