instruction
mov ds:[dx],dx
Reason: the command register using relative addressing mode, only BX, BP, SI, DI
Square brackets must be indexed (index, means SI, DI) or a base address (base, means BX, BP) register
Correct wording:
mov ds:[bx],bx
instruction
mov ds:[dx],dx
Reason: the command register using relative addressing mode, only BX, BP, SI, DI
Square brackets must be indexed (index, means SI, DI) or a base address (base, means BX, BP) register
Correct wording:
mov ds:[bx],bx