/penguinmod-cpu

The UnlicenseUnlicense

davidctinescu/penguinmod-cpu

windowsbuild3r CPU v1.6 Documentation

ISA OP-Codes

  • rvga: Test raw VGA
  • add: Add 2 numbers and store result in accumulator
  • sub: Subtract 2 numbers and store result in accumulator
  • mul: Multiply 2 numbers and store result in accumulator
  • div: Divide 2 numbers and store result in accumulator
  • lshift: Bit-wise shift left on accumulator
  • rshift: Bit-wise shift right on accumulator
  • jmp: Jump to decimal address
  • dmp: Dump stack to raw VGA, RAM, and clear stack
  • hlt: Halt program counter
  • clr: Clear accumulator
  • mov: Move data between registers
  • nop: No operation
  • wvga: Write character/characters to raw VGA, this includes registers!
  • cvga: Clear raw VGA
  • svga: Set VGA settings
  • set: Set value at RAM address (only decimal values)
  • get: Get value at RAM address (only decimal values)

System Responses (sysr)

  • 1: Failed
  • 0: Succeeded
  • -255: Jumped
  • -1: Halted

Registers

  • acc: Accumulator (decimal)
  • ir: Instruction register
  • mra: Memory read address (decimal)
  • mwa: Memory write address (decimal)
  • pc: Program counter (decimal)
  • sysr: System response (decimal)

General Purpose Registers

  • gpr0, gpr1, gpr2, gpr3: General purpose registers

Functions

  • None implemented yet

Variables

  • None implemented yet

Arguments

  • Listed with white-space, not commas!

Manipulation of Registers in Arguments

  • Use r: to specify the use-case of a register

Comments

  • None yet, planning to add ones like ;

Publication

  • Public Domain - Uni-license