English-language diagnostics and Optional for -A2 and -A3. Included in documentation on DS-RZ1BB 2,1 GB Ultra SCSI media DH-153Q1-AA. DS-RZ1BB 2,1 GB Ultra SCSI -P5 English-language diagnostics and documentation on DS-RZ1BB 2,1 GB Ultra SCSI media 0.5-Mbyte MOS memory Maximum allowable memory is 4 Mbytes 1-Mbyte MOS memory per system. Base Hardware System 2-Mbyte MOS memory includes 0.5 Mbytes. 20-Mbyte fixed-disk drive Choose only one. 42-Mbyte fixed-disk drive 1.2-Mbyte floppy-disk drive Choose only one. 159-Mbyte tabletop disk drive Choose only if less than two devices are 71-Mbyte tabletop disk drive selected in Step 6. 31-Mbyte tabletop disk drive . If only one device is selected in Step 6, DS-RZ1BB 2,1 GB Ultra SCSI extender module choose only one. If no devices are selected in Step 6, choose up to two. DS-RZ1BB 2,1 GB Ultra SCSI -DA/DB 95-Mbyte tabletop tape drive Choose only one. DS-RZ1BB 2,1 GB Ultra SCSI controller Ethernet interface Choose only one. KB Cabinet kit