vcs

Documentation

Overview

Package vcs represents the areas of memory that are internal to the VCS hardware. Compare with the cartridge package which represents memory (ROM and sometimes RAM) peripheral to the VCS.

Index

• type ChipMemory
  • func NewRIOT(prefs *preferences.Preferences) *ChipMemory
  • func NewTIA(prefs *preferences.Preferences) *ChipMemory
  • func (area *ChipMemory) ChipRead() (bool, bus.ChipData)
  • func (area *ChipMemory) ChipWrite(reg addresses.ChipRegister, data uint8)
  • func (area *ChipMemory) LastReadRegister() string
  • func (area *ChipMemory) Peek(address uint16) (uint8, error)
  • func (area *ChipMemory) Poke(address uint16, value uint8) error
  • func (area *ChipMemory) Read(address uint16) (uint8, error)
  • func (area *ChipMemory) Reset()
  • func (area *ChipMemory) Snapshot() *ChipMemory
  • func (area *ChipMemory) Write(address uint16, data uint8) error
• type RAM
  • func NewRAM(prefs *preferences.Preferences) *RAM
  • func (ram *RAM) Peek(address uint16) (uint8, error)
  • func (ram *RAM) Poke(address uint16, value uint8) error
  • func (ram *RAM) Read(address uint16) (uint8, error)
  • func (ram *RAM) Reset()
  • func (ram *RAM) Snapshot() *RAM
  • func (ram *RAM) String() string
  • func (ram *RAM) Write(address uint16, data uint8) error

Types

type ChipMemory

type ChipMemory struct {
	bus.DebugBus
	bus.ChipBus
	bus.CPUBus
	// contains filtered or unexported fields
}

ChipMemory defines the information for and operations allowed for those memory areas accessed by the VCS chips as well as the CPU.

func NewRIOT

func NewRIOT(prefs *preferences.Preferences) *ChipMemory

NewRIOT is the preferred method of initialisation for the RIOT memory area.

func NewTIA

func NewTIA(prefs *preferences.Preferences) *ChipMemory

NewTIA is the preferred method of initialisation for the TIA memory chip.

func (*ChipMemory) ChipRead

func (area *ChipMemory) ChipRead() (bool, bus.ChipData)

ChipRead is an implementation of memory.ChipBus.

func (*ChipMemory) ChipWrite

func (area *ChipMemory) ChipWrite(reg addresses.ChipRegister, data uint8)

ChipWrite is an implementation of memory.ChipBus.

func (*ChipMemory) LastReadRegister

func (area *ChipMemory) LastReadRegister() string

LastReadRegister is an implementation of memory.ChipBus.

func (*ChipMemory) Peek

func (area *ChipMemory) Peek(address uint16) (uint8, error)

Peek is an implementation of memory.DebugBus. Address must be normalised.

func (*ChipMemory) Poke

func (area *ChipMemory) Poke(address uint16, value uint8) error

Poke is an implementation of memory.DebugBus. Address must be normalised.

func (*ChipMemory) Read

func (area *ChipMemory) Read(address uint16) (uint8, error)

Read is an implementation of memory.CPUBus. Address must be normalised.

func (*ChipMemory) Reset

func (area *ChipMemory) Reset()

Reset contents of ChipMemory.

func (*ChipMemory) Snapshot

func (area *ChipMemory) Snapshot() *ChipMemory

Snapshot creates a copy of ChipMemory in its current state.

func (*ChipMemory) Write

func (area *ChipMemory) Write(address uint16, data uint8) error

Write is an implementation of memory.CPUBus. Address must be normalised.

type RAM

type RAM struct {
	bus.DebugBus
	bus.CPUBus

	RAM []uint8
	// contains filtered or unexported fields
}

RAM represents the 128bytes of RAM in the PIA 6532 chip, found in the Atari VCS.

func NewRAM

func NewRAM(prefs *preferences.Preferences) *RAM

NewRAM is the preferred method of initialisation for the RAM memory area.

func (*RAM) Peek

func (ram *RAM) Peek(address uint16) (uint8, error)

Peek is the implementation of memory.DebugBus. Address must be normalised.

func (*RAM) Poke

func (ram *RAM) Poke(address uint16, value uint8) error

Poke is the implementation of memory.DebugBus. Address must be normalised.

func (*RAM) Read

func (ram *RAM) Read(address uint16) (uint8, error)

Read is an implementatio of memory.ChipBus. Address must be normalised.

func (*RAM) Reset

func (ram *RAM) Reset()

Reset contents of RAM.

func (*RAM) Snapshot

func (ram *RAM) Snapshot() *RAM

Snapshot creates a copy of RAM in its current state.

func (*RAM) String

func (ram *RAM) String() string

func (*RAM) Write

func (ram *RAM) Write(address uint16, data uint8) error

Write is an implementatio of memory.ChipBus. Address must be normalised.