izapple2/registers.go

42 lines
1.1 KiB
Go

package main
const (
regA = 0
regX = 1
regY = 2
regP = 4
regS = 5
regPC = 6 // 2 bytes
regNone = 10
)
type registers struct {
data [8]uint8
}
func (r *registers) getRegister(i int) uint8 { return r.data[i] }
func (r *registers) getA() uint8 { return r.data[regA] }
func (r *registers) getX() uint8 { return r.data[regX] }
func (r *registers) getY() uint8 { return r.data[regY] }
func (r *registers) getP() uint8 { return r.data[regP] }
func (r *registers) getS() uint8 { return r.data[regS] }
func (r *registers) setRegister(i int, v uint8) {
r.data[i] = v
}
func (r *registers) setA(v uint8) { r.setRegister(regA, v) }
func (r *registers) setX(v uint8) { r.setRegister(regX, v) }
func (r *registers) setY(v uint8) { r.setRegister(regY, v) }
func (r *registers) setP(v uint8) { r.setRegister(regP, v) }
func (r *registers) setS(v uint8) { r.setRegister(regS, v) }
func (r *registers) getPC() uint16 {
return uint16(r.data[regPC])*256 + uint16(r.data[regPC+1])
}
func (r *registers) setPC(v uint16) {
r.data[regPC] = uint8(v >> 8)
r.data[regPC+1] = uint8(v)
}