RCA 301, Programmer'S Reference Manual

Page: 41 / 235

STATUS LEVEL SELECTION (STL)
To select a status level its proper bit configuration must be placed in the buttons 2
6
to 2° in the second ban .
Alarm Indicators
PARITY ERRORS
The following errors indicate incorrect parity in the associated register(s):
1. SORM — (Simultaneous Operation or M Registers)
2. NORN — (Normal Operation or N Registers)
3. FORL — (V or L Registers)
4. NRPE—(Repeat Register)
5. MAPE — (Memory Address Register)
6. MRPE — (Memory Register)
7. DPE — (D Register)
8. STLE — (Status Level)
OTHER ERRORS
1. COME — Error in the Comparator.
2. ARIE — Arithmetic Error caused by one of the following:
Processor with 10,000 or 20,000 character memory:
a. 2
4
bit is a "one" in MSD of both operands in an Add instruction.
b. 2
4
or 2
5
bit is a "one" in other than MSD or LSD of either operand.
c. 2
4
bit is a "one" in the MSD of one of the operands and there is a carry.
Processor with 40,000 character memory:
a. 2
4
or 2
5
bit is a "one" in other than the MSD or LSD of either operand.
b. 2
5
and 2
4
are "one's" in the MSD of both operands and there is a carry.
c. 2
5
is a "one" in the MSD of both operands.
d. 2
5
is "one" in the MSD of one operand and 2
4
is a "one" in the MSD of the other operand and there
is a carry.
3
WTT
— attempted to write to arithmetic table (HSM location — 0000-0199) with WTAB reset.
4. DDF — (Device Does Not Follow)
The device addressed is inoperable.
5. RE — (Read Error)
An error has occurred during a "read" instruction or when data is transferred from HSM to the printer
output buffer.
6. TAE — (Tape Address Error)
Parity error in the tape address.
7. CCE — (Card Compare Error)
The second read station does not compare with the first read station on the Card Reader; or the read
station does not compare with the punch on the Card Punch.
8. WE — (Write Error)
An error has occurred during a "write" instruction or when data is transferred between the Memory
Register and an input or output buffer.
9. MCP — (Missing Clock Pulse)
This is an error on the 33.3 or 66.7 KC Tape Stations.
10. SAL— (Simultaneous Alarm)
An input/output alarm has occurred and the instruction was in the Simultaneous Mode. When this light
is on, another one will also light to indicate the type of error.
11. MPE — (Multipunch Error)
A non-301 character has been recognized on a card read with the BCT switch off.
12. CIG — (Character in the Gap)
A block of less than 3 characters has been read.
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