User guide

Figure 1–1 VAX 4000 Model 106A System Ports, Controls, and LEDs
1
3
2
1 2
3 4 5 6 7 8 9 10 11 12
MLO-011850
Note
Figure 1–1 shows a Model 106A system. If you have a Model 105A,
the expansion box will not look the same. (Expansion boxes for both
models are shown in detail elsewhere in this manual.)
Optional Asynchronous Communications Ports A and B—These are the
ports to which you can connect devices or options that use asynchronous
communications. Port A is on the bottom.
Optional Synchronous Communications Ports 0 and 1—These are the ports
to which you can connect the devices or options that use synchronous
communications. Port 0 is on the bottom.
Modified Modular Jack (MMJ) Ports 0, 1, and 3—These are the ports to
which you can connect the user terminal, printer or other devices that
use asynchronous DEC423 data-line-only ports to the system unit. The
console terminal is always connected to port 3.
Asynchronous Modem Control Port (Port 2)—This is the port at which you
can connect a modem, terminal, printer, or other devices that use EIA-232
ports to the system unit.
1–2 VAX 4000 Model 105A/106A Hardware