// Creates a new virtual machine. Updates will be sent to vmUpdateCh.
func createVm(vmUpdateCh chan<- vmUpdate) *vm {
// Allocate memory.
memorySize := 1024 * 64
memory := make([]byte, memorySize)
memInit := make([]bool, memorySize)
log.Printf("Memory has %d bytes", len(memory))
// Load ROM into memory.
romFilename := "roms/model3.rom"
rom, err := ioutil.ReadFile(romFilename)
if err != nil {
panic(err)
}
log.Printf("ROM has %d bytes", len(rom))
// Copy ROM into memory.
copy(memory, rom)
// Make a CPU.
vm := &vm{
z80: nil, // Set below.
memory: memory,
memInit: memInit,
romSize: uint16(len(rom)),
vmUpdateCh: vmUpdateCh,
modeImage: 0x80,
}
vm.z80 = z80.NewZ80(vm, vm)
vm.z80.Reset()
return vm
}
func newSMS(displayLoop DisplayLoop) *SMS {
memory := NewMemory()
vdp := newVDP(displayLoop)
ports := NewPorts()
cpu := z80.NewZ80(memory, ports)
sms := &SMS{
cpu: cpu,
memory: memory,
ports: ports,
vdp: vdp,
joystick: 0xffff,
command: make(chan interface{}),
}
sms.memory.init(cpu)
sms.ports.init(sms)
return sms
}