English-language diagnostics and Optional for -VT 520 Monitor and -A3. Included in documentation on VT 520 Monitor media DH-153Q2-AA. ZYAAA-P5 English-language diagnostics and documentation on VT 520 Monitor media 0.5-Mbyte MOS memory Maximum allowable memory is 4 Mbytes 1-Mbyte VT 520 Monitor memory per system. 0.5 Mbytes is included in the 2-Mbyte MOS memory Base Hardware System. 20-Mbyte fixed-disk drive Choose only one. 42-Mbyte fixed-disk drive VT 520 Monitor-AB 1.2-Mbyte floppy-disk drive Choose only one. 159-Mbyte rackmount disk drive Choose only if less than two devices are 71-Mbyte rackmount disk drive selected in Step 6. 31-Mbyte rackmount disk drive VT 520 Monitor extender module If only one device is selected in Step 6, Rackmount kit choose only one. If no devices are selected in Step 6, choose up to two. VT 520 Monitor-RA/RB 95-Mbyte rackmount tape drive Choose only one. VT 520 Monitor controller Rackmount kit Ethernet interface Choose only one. KB Cabinet kit m is VT 520 Monitor. The Base Hardware System (Step 1) includes two serial lins. This leaves a asynchronous serial lins to choose as options. 8 serial lins Choose up to three if no other B Cabinet kit with no modem asynchronous options are selected. control, VT 520 Monitor signalling DHV11 is not currently supported on supporting 8 remote 25-pin RT-11, CTS-300, or connections MicroPower/Pascal-RT. 8 serial lins Choose only one if no other asynchronous B Cabinet kit with full modem options are selected. DHV11 is not control, VT 520 Monitor signalling currently supported on RT-11, VT 520 Monitor-300, supporting 8 25-pin connections or MicroPower/Pascal-RT. on the bulkhead 8 serial lins Choose up to three if no other Cabinet kit with no modem asynchronous options are selected. B control, VT 520 Monitor signalling DHV11 is not currently supported on supporting 8 remote MMJ RT-11, CTS-300, or DECconnect connections MicroPower/Pascal-RT. 4 serial lins Choose up to three if no other B Cabinet kit with full modem asynchronous options are selected. control, VT 520 Monitor signalling supporting 4 VT 520 Monitor-pin connections on the bulkhead