Write a PEP/8 machine language simulator that simulates the PEP/8 computer and instruction set for only the following instructions: PEP8 SIMULATOR GOAL: Write a PEP/8 machine language simulator that...

1 answer below »
Write a PEP/8 machine language simulator that simulates the PEP/8 computer and instruction set for only the following instructions:
PEP8 SIMULATOR
GOAL: Write a PEP/8 machine language simulator that simulates the PEP/8 computer and instruction set for only the following instructions:
Instruction Specifier
Instruction
Addressing Modes
Status Bits
XXXXXXXXXX
Stop execution
NA

0001 100r
Bitwise invert r
NA
NZ
0001 110r
Arithmetic shift left r
NA
NZVC
0001 111r
Arithmetic shift right r
NA
NZC
0010 000r
Rotate left r
NA
C
0010 001r
Rotate right r
NA
C
0011 0aaa
Decimal input trap
d
NZV
0011 1aaa
Decimal output trap
d, i

0100 1aaa
Character input
d

0101 0aaa
Character output
d, i

0111 raaa
Add to r
d, i
NZVC
1000 raaa
Subtract from r
d, i
NZVC
1001 raaa
Bitwise AND to r
d, i
NZ
1010 raaa
Bitwise OR to r
d, i
NZ
1100 raaa
Load r from memory
d, i
NZ
1101 raaa
Load byte from memory
d, i
NZ
1110 raaa
Store r to memory
d

1111 raaa
Store byte r to memory
d

Here are some specifics.
1. Use an array to represent the memory.
2. Use variables or arrays for the PEP8 registers. I recommend putting it all into a structure. I also recommend using an array of 16 bit values for A, X, PC, SP so that you can use the r bit from the instructions to point directly to A or X. You do NOT have to include the Status bits.
3. Use unions of structures to break up the registers and instructions into the correct bits (for example, use a structure that can be unioned to break up the 8 bit specifier into the following bit combos (4, 1, 3), (5, 3), (7, 1), (8). This will allow you to instantly extract the instruction, register and addressing modes from each instruction. Also use a union to break up the 16 bit operand into two 8 bit values.
4. Have the instructions be inputted either through the command line or better yet, through a file, in the following format for each instruction:
a. 6 Hexadecimal characters per instruction
5. After each instruction in the program is executed, output the PEP8 machine register values.
Answered 2 days AfterMay 05, 2021

Solution

Swapnil Powar answered on May 07 2021
30 Votes

PEP/8 machine language simulator that simulates the PEP/8 computer and instruction set using the above instructions.
LDWr B,i ; Load B from memory
STWr...

Submit New Assignment

Copy and Paste Your Assignment Here