- Alternative Computer Products sells printbands (and spare parts) for printers from: Dataproducts, Genicom, Centronics, Hitachi, IBM, Okidata, Unisys, and more. We also sell Sun Microsystems equipment (systems, upgrades, and spare parts). ACP can also be your source for new and obsolete disk drives from Fujitsu, Seagate, Maxtor, Micropolis and more.www.alternativecomputerpro.com