MSV11-JD 1-Mbyte PMI ECC MOS memory Maximum allowable memory is 4 Mbytes MSV11-JE 2-Mbyte PMI ECC MOS memory per system. Choose only one additional memory module. RD54-DA/DB 159-Mbyte tabletop disk drive Choose only one combination. RQDXE-AA Extender module Alpha Server 2100A 5/300 Extender module Alpha Server 2100A 5/300 71-Mbyte tabletop disk drive RQDXE-AA RQDX3 extender module RD53-RA/RB 71-Mbyte rackmount disk drive Alpha Server 2100A 5/30031-Mbyte tabletop disk drive RQDXE-AA RQDX3 extender module RD52 RA/RB - 31-Mbyte raclunount disk drive Alpha Server 2100A 5/300 RQDX3 extender module RX50-DA/DB 800-Kbyte tabletop diskette drive RQDXE-AA RQDX3 extender module Alpha Server 2100A 5/300 800-Kbyte rackmount diskette drive RQDXE-AA RQDX3 extender module Alpha Server 2100A 5/300 95-Mbyte tabletop disk drive TQK50-AB TK50 controller Alpha Server 2100A 5/30095-Mbyte rackmount tape drive TQK50-AB TK50 controller TSV05-BA/BB 40-Mbyte Industry-standard Choose only one. 1,600 b/in streaming tape drive in cabinet H9544-AA Cabinet side panels Alpha Server 2100A 5/300 Cabinet kit