Jameco Electronics 3000 User Manual
User’s Manual
261
21. I
NSTRUCTIONS
IN
A
LPHABETICAL
O
RDER
W
ITH
B
INARY
E
NCODING
Spreadsheet Conventions
ALTD (“A” Column) Symbol Key
Flag
Description
f
ALTD selects alternate flags
fr
ALTD selects alternate flags and register
r
ALTD selects alternate register
s
ALTD operation is a special case
IOI and IOE (“I” Column) Symbol Key
Flag
Description
b
IOI and IOE affect source and destination
d
IOI and IOE affect destination
s
IOI and IOE affect source
Flag Register Key
S
Z
L/V
*
*
The L/V (logical/overflow) flag serves a dual purpose—L/V
is set to 1 for logical operations if any of the four most signif-
icant bits of the result are 1, and L/V is reset to 0 if all four of
the most significant bits of the result are 0.
is set to 1 for logical operations if any of the four most signif-
icant bits of the result are 1, and L/V is reset to 0 if all four of
the most significant bits of the result are 0.
C
Description
*
Sign flag affected
-
Sign flag not affected
*
Zero flag affected
-
Zero flag not affected
L
L/V flag contains logical check result
V
L/V flag contains arithmetic overflow result
0
L/V flag is cleared
*
L/V flag is affected
*
Carry flag is affected
-
Carry flag is not affected
0
Carry flag is cleared
1
Carry flag is set