Editing IBM PC XT (5160) (section)

== Storage and Expansion ==

* '''Eight 8-bit ISA slots''' (compared to five on the 5150). The slots are at slightly narrower spacing than the 5150's, so some multi-board cards will not physically fit. Two slots (behind the hard drive cage) cannot accept full-length cards. Slot 8 has a special "slot 8 compatible" requirement — non-compatible cards in slot 8 generate an 1801 error at POST.
* '''Floppy disk drive''' — one or two 5.25" 360 KB full-height drives (Tandon TM100-2 or equivalent). Later submodels switched to half-height drives.
* '''Built-in hard drive''' — a 10 MB Seagate ST-412 with Xebec 1210 MFM controller was the standard configuration. Later submodels shipped with a 20 MB ST-225 half-height drive.
* '''No cassette port''' (removed from the 5150 design).
* '''Included Asynchronous Adapter''' — serial card with 8250 UART, standard on most submodels.
* '''Optional IBM 5161 Expansion Unit''' — adds eight more ISA slots and room for two more full-height drives, connected via an Extender Card in the host and a Receiver Card in the 5161.