RCA Spectra 70 - Page 238

Shift Left Single
8B SLA
RS
1. Fixed-Point overflow.
o - Result is zero.
Under 16 = 10.08 + 0.48 (N)
1 - Result is less than zero.
16
to 31 = 13.20 + 0.48 (N-16)
2 -
Result is greater than zero.
32
to 47 = 16.32 + 0.48 (N-32)
3 - Overflow.
48 to 63 = 19.44 + 0.48 (N-48)
Shift Right Single
8A
SRA
RS
None. 0- Result is zero. Under 16 = 8.16 + 0.48 (N)
1 - Result is less than zero.
16
to 31 = 10.32 + 0.48 (N-16)
2 -
Result is greater than zero.
32
to 47 = 12.48 + 0.48 (N-32)
3
-Not used.
48 to 63 = 12.48 + 0.48 (N-48)
Store Halfword
40 STH RX
1. Address error. Unchanged.
5.04
Store Multiple
90 STM
RS 1.
Address error.
Unchanged.
9.60
+ 2.88R
Store Word
50 ST RX 1. Address error.
Unchanged. 7.44
Subtract Halfword 4B
SH
RX
1.
Fixed-Point overflow.
0- Diff. is zero.
2. Address error.
1 - Diff. less than zero.
7.92
2 - Diff. greater than zero.
3 - Overflow.
5F SL
RX
1. Address error.
0- Not used.
8.40
Subtract Logical
1 - Diff.
not zero; no carry.
2 - Diff. zero with carry.
IF
SLR
RR
3 - Diff.
not zero with carry.
4.80
5B
S
RX
1. Fixed-Point overflow.
0- Diff. is zero.
8.88
2.
Address error.
1- Diff.less than zero.
Subtract Word
2 - Diff. greater than zero.
IB
SR
RR
3 -
Overflow.
5.28
Decimal Arithmetic Instructions
Add Decimal
FA
AP
SS
1. Address error.
0- Sum is zero.
15.84
+ 1.8L
1
+ 0.42L
2
2. Data error.
1- Sum is less than zero.
(Note 1)
3. Decimal overflow.
2 -
Sum is greater than zero.
3 -
Overflow.
Compare Decimal
F9
CP
SS 1. Address error.
o - Fields algeb. equal.
17.28
+ 1.08L
1
+ 0.42L
2
2. Data error.
1 - 1st operand algeb. less than (Note 1)
2nd
operand.
2 - 1st operand algeb. greater
than 2nd operand.
Lege-nd: Ll - number of bytes in first operand field.
N -
total number of bits shifted.
L2 - number of bytes in second operand field.
R -
number of registels specified.