8085-Simulator

Features

1. The simulator is able to take input from a file or on the command line.
2. It contains a debugger.
3. Provides syntax checking and shows the address at which the error is present.
4. User is able to manually input data into registers or memory locations using the R and M functions.

Functionalities

• R <register> - update the value of the specifed register.
• M <memory_location> - update the value at the specified memory location.
• G<address>. - run the program starting at the specified address.
• A - update the program.
• E - exits simulation.

Supported commands

The Simulator supports the following commands:

• Load and Store - MOV , MVI , LXI , LDA , STA , LHLD , SHLD , STAX , XCHG
• Arithmetic - ADD , ADI , SUB , INR , DCR , INX , DCX , DAD , SUI
• Logical - CMA , CMP
• Branching - JMP , JC , JNC , JZ , JNZ
• One Additional command SET which sets data into valid memory locations (ex. SET 2500,0A).

Giving input on console

• The simulator automatically adjusts the program counter according to the instruction used.
• The simulator takes input until EOF is encountered.

Reading input from a file

The path to the input file can be passed as a command line argument when running the executable.

Using the debugger

Debugger can be used by passing --debugger as a command line argument when running the executable.

The commands for the debugger are:

1. break or b <line no>:- It will set break point on given line number.
2. run or r :- It will run the program until it ends or breakpoint is encountered.
3. step or s :- It will run the program one instruction at a time.
4. print or p <register/xmemory_location>:- It prints the value of register or memory location. for ex p A will print the value of register A. p x2500 will print the value at memory location x2500 (if any).
5. quit or q:- Quit the debugger.
6. help:- Show all the commands of debugger.