Drive · 1985ObsoleteRare · 70

Apple UniDisk 3.5

Name: Apple UniDisk 3.5
Brand: Apple

A2M2053 · Apple external floppy

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Identifiers

Order number

A2M2053

Colors	Beige
Drive type	3.5″ 800K floppy (intelligent)
Capacity	800 KB double-sided
Interface	DB-19 disk port (daisy-chain)
Mechanism	65C02 @ 2 MHz + IWM controller (2 KB RAM / 8 KB ROM)
Compatibility	ProDOS, GS/OS, Mac HFS

Ports & connectivity

DB-19 disk port (daisy-chain passthrough)

"Intelligent" drive — an onboard 65C02, IWM chip, RAM and firmware let it talk to the host in packets
Apple's first 3.5″ drive for the Apple II line, using Sony's 800 KB double-sided mechanism
On an Apple IIGS or IIc Plus (with the newer IWM) it falls back to acting as a plain 800K drive
Daisy-chain passthrough allows a second 3.5″ drive off the back

Have one in your collection? Track it on Orchard.