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2.1.1.2 Usage Meter
The customer usage meter records system operating time.
Recorded time starts when you press the start key or the
load key and ends when the job is completed.
However, when operating in one of the step modes, the
meter runs for 400 us. each time the start key is pressed.
Time is not recorded if one of the following conditions
exists:
• Manual or programmed halt stops processing unit. (How-
ever, time is recorded when 1/0 operations are being per-
formed during a programmed halt.)
• A processor check occurs.
• Power is lost.
• The CE key switch is turned off for system servicing.
2. 1. 1.3 Message Display Unit
This two-position message display unit (Figure 2-3) keeps a
running display of the halt identifier portion of a halt in-
struction.
2.1.1.4 Processor Check Light
This light (Figure 2-3) is turned on when:
• An invalid op code, an invalid address, or a parity error
is detected in the CPU.
• The device address (including the M field) and the N
field of an 1/0 instruction is not recognized.
• The 1/0 device recognizes a parity error on data bus out
at the 1/0 attachment.
• The immediate 1/0 error stop is on and an 1/0 error
occurs.
This light is turned off wheri a system reset occurs or when
the CE check-reset key is activated.
The processor stops on any of the above errors, and 1/0
data may be lost. The console display (2.1.3) shows the
error. Following a processor check, use the program load
procedure for a normal restart.
2-2 (1/71)
2.1.1.5 1/0 Attention light
The 1/0 attention light (Figure 2-3) comes on when an ad-
dressed 1/0 device requires normal operator intervention.
Normal operator intervention includes:
• Printer-Forms out, cover interlock.
• MFCU-Hopper empty, stacker full, chip box full, cover
interlock.
The light goes off when the operator has intervened and
returned the device to the ready state. 1/0 attention does
not stop normal CPU processing. However, start 1/0 or
load 1/0 instructions are not accepted.
2.1.1.6 Power On/Off Switch
This switch (Figure 2-3) initiates the power on/off sequence
of the system.
As
part of the power on/off sequence, a
system reset is performed so that no 1/0 operations take
place until they are specifically directed. The contents of
main storage are not guaranteed after power on/off se-
quence.
Note: A power check occurs if the power on/off switch is
turned on before a normal system power off sequence is
completed.
2.1.1.7 Program Load Key
This key (Figure 2-3) is used for initial program loading.
As part of the program load sequence, a system reset is
performed. Pressing the program load key allows the first
record from the 1/0 device (normally the MFCU primary
hopper) to be read and stored in main storage, beginning
at location 0000. When the key is released, the CPU
executes the instruction sequence starting at location 0000.
The console 1/0 attention light comes on when the program
load key is activated if the 1/0 device is in a not ready state.
To complete the program load function, the device must be
readied.
2.1.1.8 Stop Key/Light
Pressing this key (Figure 2-3) stops the processor at the end
of the operation being performed. 1/0 transfers are com-
pleted without losing information. The stop light comes on
to indicate processor stop. The processor may be restarted
without loss of information by pressing the start key.
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