Dear Erik,

Take a look at original op-codes for instruction set of 8031/8051.

mov direct, direct is described as mov source, destination (op-code 0x85)

if you have an .asm instruction as
mov 0x14, 0x15
the instruction can be taken care by assembler and

the hex will have it as
85 15 14
85 opcode for mov direct, direct
15 source data address
14 destination data address

but cannot be guaranteed.
(hence in earlier post I had suggested him to see the manual of his assembler)

Hence Mr. Alan has to see the .lst (or equivalent) file
wheather mov sbuf, 0x44 is converted as
85 99 44
or
85 44 99

Regards,
Mahesh