DASD Module P/N 00F5538
CR1 Run/Check LED
CR2 Drive 1 Check LED
CR3 Drive 2 Check LED
CR4 Drive 1 LED
CR5 Drive 2 LED
J4,7 Molex power connector
J2,5 Drive connectors
J3,4 Drive connectors
J1 40-pin floppy header
U24 FDC controller
U24 I think there are two revisions
of FDC - The older one, used with the 720K floppy is P8272A, the newer
one, used with the 1.44MB floppies is the NEC D765AC. I have two DASD modules,
both boards appear identical, have identical P/Ns, but use different FDCs.
I have a 1.44MB floppy in one (with the 765 FDC). Uses the 8580 style floppy
with the big button below and to the right of the slot. ALPS DFL713A01A,
Hard Drive in my toy is a WD-325M2, MFM for all I can tell.
The 7552 uses the same U channel drive rails that the 7568 does. The floppy
mount is the same (faceplate and rails).