RCA 70/46 Reference Manual page 131

Set
Program Mask
(SPM)
General Description
Format
(RR)
Condition Code
Program Mask
Processor
State Control
Instructions
• Bits 2-7 of the general register specified by the first address (R
1 )
establish new program masks and condition code setting for the current
program state.
04
o
7 8 11 12
15
• The condition code is set according to bits 2 and 3 of the general register
specified by Rl as follows:
Condition Code Setting
2
3
Result
0
0
Set condition code 0 (zero).
0 1
Set condition code 1.
1 0 Set condition code 2.
1 1 Set condition code 3.
• The program mask is set according to bits 4-7 of the general register
specified by Rl as follows:
Program Mask Setting
Bit Result
4 Fixed-point overflow.
5 Decimal overflow.
6
Exponent underflow.
7 Significance error.
Note •
The contents of the P-counter and the register specified by the first
address are unaltered.
122