Class: Badline::VIC::DisplayState

Inherits:
Object
  • Object
show all
Defined in:
lib/badline/vic/display_state.rb

Constant Summary collapse

FIRST_LINE =

48: bad lines and the DEN-at-$30 latch begin here

0x30
LAST_LINE =

247

0xf7
COLUMNS_PER_ROW = 
40

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(registers) ⇒ DisplayState

Returns a new instance of DisplayState.



12
13
14
15
16
17
18
19
 
# File 'lib/badline/vic/display_state.rb', line 12

def initialize(registers)
  @registers = registers
  @vc_base = 0
  @rc = 0
  @display = false
  @bad_lines_enabled = false
  @bad_line = false
end

Instance Attribute Details

#rc ⇒ Object (readonly)

Returns the value of attribute rc.



10
11
12
 
# File 'lib/badline/vic/display_state.rb', line 10

def rc
  @rc
end

#vc_base ⇒ Object (readonly)

Returns the value of attribute vc_base.



10
11
12
 
# File 'lib/badline/vic/display_state.rb', line 10

def vc_base
  @vc_base
end

Instance Method Details

#bad_line? ⇒ Boolean

Returns:

  • (Boolean) 


23
 
# File 'lib/badline/vic/display_state.rb', line 23

def bad_line? = @bad_line

#cycle(rasterline, column) ⇒ Object 



34
35
36
37
38
39
40
 
# File 'lib/badline/vic/display_state.rb', line 34

def cycle(rasterline, column)
  @bad_lines_enabled = true if rasterline == FIRST_LINE && @registers.display_enabled?

  load_vc(rasterline) if column == 14
  trigger_bad_line(rasterline) if column.between?(12, 54)
  check_row_counter if column == 58
end

#display? ⇒ Boolean

Returns:

  • (Boolean) 


21
 
# File 'lib/badline/vic/display_state.rb', line 21

def display? = @display

#idle? ⇒ Boolean

Returns:

  • (Boolean) 


22
 
# File 'lib/badline/vic/display_state.rb', line 22

def idle? = !@display

#new_frame ⇒ Object 



25
26
27
28
 
# File 'lib/badline/vic/display_state.rb', line 25

def new_frame
  @vc_base = 0
  @bad_lines_enabled = false
end

#new_line ⇒ Object 



30
31
32
 
# File 'lib/badline/vic/display_state.rb', line 30

def new_line
  @bad_line = false
end