## ROL = Rotate Left

Hex | Mnemonic | Cycles
--- | --- | ---
CE 94 | ROL A | 12
CE 95 | ROL B | 12
CE 96 nn | ROL [N+#nn] | 20
CE 97 | ROL [HL] | 16

### Execute

    A       = Register A
    B       = Register B
    [N+#nn] = Memory: (I shl 16) or (N shl 8) or #nn
    [HL]    = Memory: (I shl 16) or HL

    ; ROL Ds
    ;
    ; Ds = Source/Destination

    Ds = (Ds SHL 1) OR (Ds SHR 7)

### Description

"8-Bits Destination" bits are rotated left by 1.

### Conditions

Zero: Set when result is 0

Carry: Set when bit 0 of the result is 1

Sign: Set when bit 7 of the result is 1

Overflow remain unchanged

### Examples

    ; A = 0x04
    ROL A
    ; A = 0x08
    ; F = (Zero=0):(Carry=0):(Sign=0)

    ; B = 0x45
    ROL B
    ; B = 0x8A
    ; F = (Zero=0):(Carry=0):(Sign=1)

    ; B = 0x84
    ROL B
    ; B = 0x15
    ; F = (Zero=0):(Carry=1):(Sign=0)

    ; [HL] = 0x80
    ROL [HL]
    ; [HL] = 0x01
    ; F = (Zero=0):(Carry=1):(Sign=0)

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