Andre Myrick - Computer Architecture

[AM-Myrick]

Day 1: Get print8.ls8 running

• Inventory what is here
• Implement struct cpu in cpu.h
• Add RAM functions cpu_ram_read and cpu_ram_write
• Implement cpu_init()
• Implement the core of cpu_run()
• Implement the HLT instruction handler
• Add the LDI instruction
• Add the PRN instruction

Day 2: Add the ability to load files dynamically, get mult.ls8 and stack.ls8 running

• Un-hardcode the machine code
• Implement the cpu_load function to load an .ls8 file given the filename passed in as an argument
• Implement a Multiply instruction and Print the result (run mult8.ls8)
• Implement the System Stack and be able to run the stack.ls8 program

Day 3: Get call.ls8 running

• Implement the CALL and RET instructions
• Implement Subroutine Calls and be able to run the call.ls8 program

Stretch

• Add the timer interrupt to the LS-8 emulator
• Add the keyboard interrupt to the LS-8 emulator

[codejoncode]

It wasn't needed today but maybe needed down the road add a flag to your cpu struct unsigned char FL;

[codejoncode]

great job Andre looks like you should be able to read files.

[codejoncode]

..

[codejoncode]

unsigned char operandA = ram[(cpu->PC + 1) & 0xff];
unsigned char operandB = ram[(cpu->PC + 2) & 0xff];

// True if this instruction might set the PC
int instruction_set_pc = (IR >> 4) & 1;
//Above^^^^^^^^^^^should before the while loop

// increase PC after the switch

if (!instruction_set_pc) {
    cpu->PC += ((IR >> 6) & 0x3) + 1;
}

//this is because the first 2 bits to the left of the instruction will tell you how many operands

this will prevent you from having to use two switch statements.

Some more advance stuff but you could do this instead of incrementing on each individual switch. I know you're usually interested in less lines.