Editing IBM PS/2 Model 30 (section)

== Storage and Expansion ==

* '''Floppy interface''': PS/2 single-cable, carrying both power and data on one ribbon. Same as Model 25. Drives are typically ALPS, Mitsubishi, Sony or YE-Data. The Model 30 8086 BIOS only supports 720 KB diskettes natively, though specific Sony 1.44 MB drives are documented to work. The Model 30 286 supports 1.44 MB natively.
* '''Hard drive interface''' (Model 30): Proprietary planar-integrated ST-506 controller. Different from later MCA models' ESDI. Setup disk does not offer alternative drive types &mdash; only two or three specific drive part numbers will work. The drive sits in a caddy.
* '''Expansion bus''': Three '''ISA''' slots on a riser card. 8-bit on the Model 30, 16-bit on the Model 30 286.
* '''No MCA''' &mdash; the Model 30 is the only original PS/2 (along with the Model 25) that uses ISA.