Indeed, so, since lcall is opcode 12h, ljmp 02h, and mov DPTR 90h, when using the 16-bit address 1234h as the operand, do the machine language instructions become

lcall: 12 12 34
ljmp: 02 12 34
mov DPTR: 90 12 34

for a big-endian kind of usage, or

lcall: 12 34 12
ljmp: 02 34 12
mov DPTR: 90 34 12

for a little-endian kind of usage?