Commodore CBM Model 3040 Dual Drive Floppy Disk
The Commodore 3040 it’s a dual drive 5¼” floppy disk subsystem for Commodore International computers. It uses a wide case form, and uses the IEEE-488 interface common to Commodore PET/CBM computers.
These drive models use a similar single density, single side floppy data storage format to that used by the Commodore 1541 drive, but with a slightly different data marker indicating which model originally formatted the disk. The low-level disk format was similar enough to allow reading between models, but different enough that one series of drive models could not reliably write to disks formatted with one of the other model series.
Gallery before cleaning:
Cleaning cover lock & replaced tantalum capacitors:
Gallery:
Download: CBM 2040-3040-4040-8050 Disk Drive Manual (2071)
source: wikipedia
Do you happen to have an original Commodore 3040 Test/Demo diskette that came with the unit? It would be very interesting to get a G64 dump of it to see the actual GCR format used by Commodore DOS 1.2 which seems to be installed in that particular unit (901468-06 and 901468-07 chips seen on the PCB).
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