English-language diagnostics/ Optional for -A2 and -A3. Included in documentation on BA35X-EB Monitoring Module media DH-183Q1-AA. English-language diagnostics/ documentation on TK50 media BA35X-EB Monitoring Module ECC MOS memory Maximum allowable memory is 4 Mbytes 2-Mbyte PMI ECC MOS memory per system. Choose only one additional memory module. 159-Mbyte tabletop disk drive Choose only one combination. RQDXE extender module The RD54 is not currently supported on ULTRIX-11 V3.0. BA35X-EB Monitoring Module rackmount disk drive RQDXE extender module 71-Mbyte tabletop disk drive RQDX3 extender module 71-Mbyte rackmount disk drive RQDX3 extender module BA35X-EB Monitoring Moduletabletop disk drive RQDX3 extender module 31-Mbyte rackmount disk drive RQDX3 extender module