Disk Drives

Controllers

This information comes mostly from the A2wiki and the Apple II Documentation Project. Corrections and additional information welcome.

Image from Documentation Project	Description
	Apple Disk II Interface Card The very first adapter, 2 x 20 pin connectors, eight chips of which two are ROMs. 650-X104 (c)1978 Works with Disk II SSDD 5.25", 140k.
	Apple 5.25 Controller Card "19 pin" -- The same design as the previous card. 820-5003-A (c)1983 Works with Disk II SSDD 5.25", 140k.
	Apple Disk II IWM Controller Card 344-0041 IWM, 6309 PROM, 74LS245 buffer, 2 x 20 pin connectors, (c)1983
	Apple 3.5 Floppy Disk Drive Interface Card "Liron" was the code name for the IWM chip. 344-0041-B IWM. 603-9107-A, 820-0117-A. (c)1985 Works with Unidisk 3.5" drives, SSDD (400k) or DSDD (800k), GCR of course.
	Apple Universal Controller Card IWM 344-0041-B (c)1986? Supports both 5.25" and 3.5" drives, GCR, SSDD on 5.25", and both SSDD (400k) and DSDD (800k) on 3.5". Works with the external (not Unidisk) 3.5" disk (This Apple support article seems to indicate that the Unidisk 3.5 has a buffer built in -- which makes sense). Rare. This seems to be the same chipset as used by the Apple IIc+, namely the Magic Interface Glue (MIG) chip top right, IWM bottom right, and quite probably the 2K SRAM top left.
	Apple II 3.5 Disk Controller Card "Superdrive" : This controller contains a 6502 processor, 32K static RAM, and a SWIM chip. 820-0500-A (c)1991 Works with Unidisk 3.5" (A2M2053) or FDHD (G7287) drives. Can do both GCR (400/800k) and MFM (720k / 1.44M).

• Which 3.5" drive/interface combinations work on a IIe? -- from myoldmac.net.

IWM

Name	Part Number	Package	Text	Used in
IWM	344-0041	DIP 28		Apple Disk II IWM Controller Apple Universal Controller Card
IWM	344-0041-B	DIP 28	VF4060-0001 Apple 1982, 83	Mac M0001P
IWM	344-	DIP 28	VLSI (c) Apple '82	Mac Plus
IWM	344-0061-1	DIP 28	VLSI VC2982-0001 (C) Apple '88	Mac SE FDHD
SWIM	343S0061-A	44 PLCC J	(C) Apple 1988	Macintosh Classic, Macintosh IIci