CPYBREP From the V5R3 MI manual (nothing new)

Copy Bytes Repeatedly (CPYBREP)
 

Op Code (Hex) 
Operand 1 
Operand 2 
 
 

10BE 
Receiver 
Source 
 
 
Operand 1: Numeric variable scalar or character variable scalar. 
Operand 2: Numeric scalar or character scalar. 
Description:   The logical string value of the source operand is repeatedly
copied to the receiver operand until the receiver is filled. The operands
can be either character or numeric. Any numeric operands are interpreted as
logical character strings. 
The operation begins with the two operands left-adjusted and continues until
the receiver operand is completely filled. If the source operand is shorter
than the receiver, it is repeatedly copied from left to right (all or in
part) until the receiver operand is completely filled. If the source operand
is longer than the receiver operand, the leftmost bytes of the source
operand (equal in length to the receiver operand) are copied to the receiver
operand. 
Substring operand references that allow for a null substring reference (a
length value of zero) may be specified for operands 1 and 2. The effect of
specifying a null substring reference for either operand is that no result
is set. 
If either operand is a character variable scalar, it may have a length as
great as 16,776,191.