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