HLASM Language Reference

Examples of Coded Machine Instructions
┌────────┬────┬────┬────┬────────────┐
│Op Code │ R │ X │ B │ D │
└────────┴────┴────┴────┴────────────┘
8 12 16 2 31
Symbols used to represent registers (see REG1, INDEX, and BASE in the ALPHA2
instruction below) are assumed to be equated to absolute values between 0 and
15.
Symbols used to represent implicit addresses (see IMPLICIT in the instructions
labeled GAMMAn below) can be either relocatable or absolute.
Symbols used to represent displacements (see DISPL in the instructions labeled
BETA2 and LAMBDA1 below) in explicit addresses are assumed to be equated to
absolute values between 0 and 4095.
Examples:
ALPHA1 L 1,2(4,1)
ALPHA2 L REG1,2(INDEX,BASE)
BETA1 L 2,2(,1)
BETA2 L REG2,DISPL(,BASE)
GAMMA1 L 3,IMPLICIT
GAMMA2 L 3,IMPLICIT(INDEX)
DELTA1 L 4,=F'33'
LAMBDA1 BC
7,DISPL(,BASE)
LAMBDA2 BC
TEN,ADDRESS
When assembled, the object code for the instruction labeled ALPHA1, in
hexadecimal, is:
5814AC8
where:
58 is the operation code
1 is register R
4 is index register X
A is base register B
C8 is displacement D from base register B
When assembled, the object code for the instruction labeled GAMMA1, in
hexadecimal, is:
5824xyyy
where:
58 is the operation code
2 is register R
4 is the index register X
x is base register B
yyy is displacement D from base register B
96 HLASM V1R5 Language Reference