Specifications

CHAPTER 12 1. ’
THE OPERATOR’S CONSOiE
‘The PDP-11 Operator’s Console has been configured to achieve convenient
control of the system. Through switches and keys on the console, programs
or information can be manually inserted or modified. Also.indioator lamps on
,
the console face display the status of the machine, the contents of t’he Bus
Address Register and the data at the output of the data paths. _
The consoie is shown in Figure 12-1.
kllilaliltlalll lcidial
ll
Figure 12-1
CONSOLE ELEMENTS
The console has the following indicators and switches:
1. A bank.of 8 indicators, indicating the following conditions or oper-
‘ations: Fetch, Execute, Bus, .Run, Source, Destination and Address
(2 bits).
2. An l&bit Address Register Display
3. .A 18bit Data Register Display
4. An l&bit Switch Register
5. Control Switches:
a. LOAD ADDR (Load Address)
b. EXAM (Examine)
c. CONT (Continue)
,d. .ENABLE/ HALT
e. SIINST-S/CYCLE (Single Instruction/Single Cycle)
f. START
g. DEP (Deposit)
INDICATOR LIGHTS-The indicators signify specific machine functions,
operations, or states. Each is defined below.
1. Fetch-indicates that thdcentral processor is in the state of fetching
an instruction.
2. Execute-indicates that the central processor is in the state of
executing an instruction.
87