Bite Status Indicators - Singer SKC-2000 User Manual

THE SINGER COMPANY
KEARFOTT DIVISION
Y240A200M202
REV. _ _ _
When the Selector switch is set to ALL, after completing each instruction execution, the program
interrupts to a subroutine, which can be used for tracing or other purposes. The program interrupt
remains masked until the Return Address (RTA) instruction is executed.
When the Selector switch is set to JUMPS, each successful jump will cause program interrupt
transfers to a subroutine which can be used for tracing or other purposes. The three program
interrupt sources are combined with Teletypewriter (TTY) and paper tape reader interrupts, and
merged into the control panel program interrupt No. 14 through the AGE connector.
2.11.3 INTERRUPT SWITCH
This switch is used to activate the Utility Inter'rupt mode when the selector switch is in the
INTERRUPT position and the ENABLE switch is set to ON.
2.12 BITE STATUS INDICATORS
2.12.1 SYSTEM ALARMS (1-4)
These lights, in conjunction with the TEST MODE switch, are used to obtain a visual indication of
the computer's condition. Table 2-1 below shows the conditions required to light these indicators.
TEST MODE
SWITCH
POSITION
NORM
COMPONLY
OR
STOP ON
FAIL
SWITCH
ALARMS
1
TABLE 2-1.
CONDITION FOR ON
Unprotected block of memory in modules 3 and 4.
2 Computer not OK.
3,4 Program Controlled
1
2
3
4
Lights if computer tires to execute all logic" 1" or all logic
"0" op code.
DC power failure.
Memory Release Time Out.
Indirect Addressing Failure.
The functions of the remaining indicators are contained in Table 2-2.
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