English-language diagnostics/ Optional for B2 and B3. Included in - - documentation on AlphaStation 250/233 DH 173Q 1 BA. - - ZYAAA P5- English-language diagnostics/ documentation on TK50 media 1-Mbyte MOS memory Maximum allowable memory is 4 Mbytes 2 Mbyte MOS memory - per system. 1 Mbyte is included in the Base Hardware System. 159-Mbyte tabletop disk drive Choose only one. AlphaStation 250/233 The RD54 is not currently supported on ULTRIX-11 V. 3.0. 71-Mbyte tabletop disk drive RQDX3 extender module 31 Mbyte tabletop disk drive - RQDX3 extender module 800 Kbyte tabletop - AlphaStation 250/233 RQDX3 extender module 95-Mbyte tabletop tape drive AlphaStation 250/233 TSV05 BA/BB - 40-Mbyte Choose only one. industry-standard 1,600-b/in streaming-tape drive AlphaStation 250/233 Cabinet side panels Cabinet kit Ethernet interface Choose only one.