• 1- or 2-Mbyte increments of parity MOS memory expandable up to 4 Mbytes (depending on configuration) • One serial-line standard for connection of console terminal • 22-bit Q-bus backplane • I/O distribution panel for easy device connection • Choice of pedestal, tabletop, rackmount, 31 MB MFM 5,25" floorstand, or cabinet-based (field upgrade only) packaging • Optional four-line or eight-line asynchronous multiplexer from 50 to 31 MB MFM 5,25" 9600 baud (DZQ11 or DHV11) • Optional Ethernet capability (DEQNA) • 31 MB MFM 5,25", 71-Mbyte, or 31-Mbyte fixed-disk drive (RD54, RD53, or RD52) • 800-Kbyte dual-diskette drive (RX50) • 31 MB MFM 5,25" cartridge-tape drive (TK50) • 52-Mbyte (26 fixed/26 removable) tabletop disk drive (RC25) • The following items may be integrated by customers in the field: -31 MB MFM 5,25" high-capacity fixed-disk drive for the cabinet package (RA81) - 205-Mbyte high-capacity removable-disk drive for the cabinet package (RA60) -40-Mbyte industry-standard, 1,600-b/in steaming-tape drive (31 MB MFM 5,25")