Module: Badline::InstructionSet::Branch

Instance Method Summary collapse

Branch if carry clear (C=0).

Opcodes:

$90 - relative - 2+ cycles



10
11
12

# File 'lib/badline/instruction_set/branch.rb', line 10

def bcc(addr, _value)
  branch(addr) unless status.carry?
end

Branch if carry set (C=1).

Opcodes:

$B0 - relative - 2+ cycles



18
19
20

# File 'lib/badline/instruction_set/branch.rb', line 18

def bcs(addr, _value)
  branch(addr) if status.carry?
end

Branch if equal (Z=1).

Opcodes:

$F0 - relative - 2+ cycles



26
27
28

# File 'lib/badline/instruction_set/branch.rb', line 26

def beq(addr, _value)
  branch(addr) if status.zero?
end

Branch if minus (N=1).

Opcodes:

$30 - relative - 2+ cycles



34
35
36

# File 'lib/badline/instruction_set/branch.rb', line 34

def bmi(addr, _value)
  branch(addr) if status.negative?
end

Branch if not equal (Z=0).

Opcodes:

$D0 - relative - 2+ cycles



42
43
44

# File 'lib/badline/instruction_set/branch.rb', line 42

def bne(addr, _value)
  branch(addr) unless status.zero?
end

Branch if plus (N=0).

Opcodes:

$10 - relative - 2+ cycles



50
51
52

# File 'lib/badline/instruction_set/branch.rb', line 50

def bpl(addr, _value)
  branch(addr) unless status.negative?
end

Branch if overflow clear (V=0).

Opcodes:

$50 - relative - 2+ cycles



58
59
60

# File 'lib/badline/instruction_set/branch.rb', line 58

def bvc(addr, _value)
  branch(addr) unless status.overflow?
end

Branch if overflow set (V=1).

Opcodes:

$70 - relative - 2+ cycles



66
67
68

# File 'lib/badline/instruction_set/branch.rb', line 66

def bvs(addr, _value)
  branch(addr) if status.overflow?
end