Jameco Electronics 3000 Spreadsheet Conventions, ALTD “A” Column Symbol Key, Flag Register Key

Models: 3000 2000

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ALTD (“A” Column) Symbol Key

21.INSTRUCTIONS IN ALPHABETICAL ORDER WITH BINARY ENCODING

Spreadsheet Conventions

ALTD (“A” Column) Symbol Key

Flag

Description

 

 

fALTD selects alternate flags

fr

ALTD selects alternate flags and register

rALTD selects alternate register

sALTD operation is a special case

IOI and IOE (“I” Column) Symbol Key

Flag

Description

 

 

bIOI and IOE affect source and destination

dIOI and IOE affect destination

sIOI and IOE affect source

 

 

 

 

Flag Register Key

 

 

 

 

 

S

Z

L/V *

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

 

 

 

 

 

*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.

User’s Manual

261

Page 270
Image 270
Jameco Electronics 3000, 2000 Spreadsheet Conventions, ALTD “A” Column Symbol Key, IOI and IOE “I” Column Symbol Key, Flag