Place MASM in the D drive. Start DOSBox and enter mount c d:\masm and press Enter. This command mounts the D drive MASM as the C drive. Because when you first start, it is on the Z drive. Next, enter c: and press Enter; it has successfully started and is now usable.
General-purpose registers: AX, BX, CX, DX
Index registers: SL, DL
Pointer registers: SP, BP
Instruction pointer register: IP
Segment registers: CS, SS, DS, ES
Flags register: PWS
MOV for moving data
ADD for addition
DIR to view the directory.
DEBUG for debugging – -r to view register contents. – -d to view contents in memory. – -e to change contents in memory. – -u to disassemble machine instructions into assembly instructions. – -a to write machine instructions in memory in assembly format. – -t for step-by-step debugging to observe the execution process of the machine.