RCA 70/46 User Manual

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Priority No.
24
25
Condition
Address Error
(Cont'd)
Data Error
Table 9. Interrupt Conditions (Cont'd)
Flag Bit
2
23
224
Explanation
4. A floating-point instruction addresses a floating-point register other than 0, 2,
4, 6. The operation is suppressed.
Specification - An address error (specification) interrupt occurs when:
1. A data, instruction, or control word address does not specify a doubleword, word,
halfword, or byte boundary as required by the particular instruction concerned.
The operation is suppressed.
2. The multiplier or divisor in decimal arithmetic exceeds 15 digits and sign. The
operation is suppressed.
3. The first operand field is not longer than the second operand field in decimal
division
or multiplication. The operation is suppressed.
4. Bit positions 28 through 31 of the second operand of a Set Storage Key or Insert
Storage Key instruction are not zero. The operation is suppressed.
5. The Memory Protect option is not installed and the protection key in the Inter-
rupt Status register is not zero. The operation is suppressed.
6. The Program Control instruction specifies an instruction address which is not on
a
halfword boundary. The operation is suppressed.
P1"otection - An address error (protection) interrupt occurs when the storage key
and the protection key of the result main memory location do not match, and neither
is zero. The operation is suppressed if the first main memory location specified that
the instruction is in a protected area. The operation is terminated with unpredictable
results if the instruction is in progress when the protected area is addressed. (This
interrupt can only occur if the Memory Protect option is installed.)
Notes:
1. If an address error type interrupt occurs during an input/output operation (after
initiation), an address error interrupt does not occur. Instead, a channel interrupt
occurs for the appropriate channel.
2. It is a program restriction that the mask bit in processor state P 3 for this inter-
rupt condition must always be zero when this interrupt occurs.
This interrupt occurs when any of the following conditions occur:
1. The sign or digit codes of operands in decimal arithmetic, editing, or Convert To
Binary instructions are incorrect.
2. Fields overlap incorrectly in decimal arithmetic.
3. A decimal multiplicand has too many high-order, significant digits.
The operation is terminated (suppressed if the operation is a Convert To Binary
instruction) upon detection of any of the above.
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RCA 70/46 Specifications

General

Brand	RCA
Model	70/46
Category	Computer Hardware
Language	English