AT&T 3B2/300 Technical Reference Manual page 367

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - -
OPCODE
OPl
Bits 14-10 are the Operation Code (OPCODE) field. The OPCODE field specifies
the operation to be done. The OPCODES are as follows.
OPCODE MNEMONIC
INSTRUCTION
Ox 02 ADD ADD
Ox 03 SUB SUBTRACT
Ox 04 DIV DIVIDE
Ox 05 REM REMAINDER
Ox 06 MUL MULTIPLY
Ox 07 MOVE MOVE
Ox 08 RDASR MOVE FROM ASR
Ox 09 WRASR MOVE TO ASR
Ox OA CMP COMPARE
Ox OB CMPE COMP ARE WITH EXCEPTIONS
Ox OC ABS ABSOLUTE VALUE
Ox OD SQRT SQUARE ROOT
Ox OE RTOI
ROUND TO INTEGRAL VALUE
Ox OF FTOI CONVERT FLOATING POINT TO INTEGER
Ox 10 ITOF CONVERT INTEGER TO FLOATING POINT
Ox 11 DTOF CONVERT DECIMAL TO FLOATING POINT
Ox 12 FTOD CONVERT FLOATING POINT TO DECIMAL
Ox 13 NOP NO OPERATION
Ox 14 EROF EXTRACT RESULT ON FAULT
Ox 17 NEG NEGATE
Ox 18 LOR LOAD DATA REGISTER
Ox lA CMPS COMPARE WITH FLAGS SWAPPED
Ox 1B CMPS COMPARE WITH EXCEPTIONS AND FLAGS SWAPPED
Bits 09-07 is the Operand Specifier 1 (OPl) field. OPl specifies whether the first
source operand is a MAU register, a memory-based operand of a given size, or
nonexistent (no operand). The value of this field is as follows.
BITS 09 - 07 OPERAND LOCATION
000
REGISTER FOOR F4 (DEPENDING ON RBl)
001
REGISTER Fl OR F5 (DEPENDING ON RBl)
010
REGISTER F2 OR F6 (DEPENDING ON RBl)
011 REGISTER F3 OR F7 (DEPENDING ON RBl)
100 MEMORY-BASED SINGLE WORD
101
MEMORY-BASED DOUBLE WORD
110
MEMORY-BASED TRIPLE WORD
111
NO OPERAND
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