Revised opcodes

[thosakwe]

• REGISTER - Get the index of the first available register, or create a new one. The index is placed on the stack.
• LDR reg, offset, size - Read size (max 8) bytes from offset, store in reg
• STO offset, reg, size
• NEW - Pops a size from stack, then calls malloc. Pushes address to stack
• FREE - free a pointer of memory
• BANK nn - Switch the R/W memory base pointer. Useful after calling NEW.
• CUR_BANK - Push the base pointer of the current bank
• PUSH nn - Push the value from a given register to the stack.
• POP nn - Pop the top stack value to the given register.
• MUL nnA, nnB - Multiply register A by B, store in A
• DIV nnA, nnB
• MOD nnA, nnB
• ADD nnA, nnB
• SUB nnA, nnB
• AND regA, regB
• OR regA, regB
• XOR regA, regB
• CMP regA, regB - Boolean comparison of numbers
• NOT - Invert carry flag (xor cf, 0xFF)
• JMP nn - Jump...
• JZ nn
• JNZ nn
• JG nn
• JGE nn
• JL nn
• JLE nn
• RET - Pop address from stack, jump
• CALL nn - Push next address to stack, then jump to nn