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Disk #8: Low Resolution Graphics

The LoRes collection contains macros and subroutines for creating and displaying low resolution graphics on the Apple II. This includes macros to:

  • plot low resolution pixels
  • set the working low resolution page and the viewing low resolution page
  • set the low resolution mode: full screen or mixed
  • plot horizontal, vertical and diagonal lines
  • plot a low resolution circle
  • get a low resolution pixel's color value
  • print a low resolution character to the screen
MACRO DEPENDENCY PARAMETERS ACTION DESTROYS CYCLES BYTES
LWORKPG none ]1 = page number set the working page NZCV 27+ 20
LVIEWPG none ]page number set the viewing page NZCV 21+ 16
LRGF none none set full page mode NZCV 12+ 9
LRGP none none set mixed page mode (partial) NZCV 12+ 9
LFCLR LRGFCLR ]1 = color code fill screen with specified color (full screen) NZCV 139+ 92
LPCLR LRGPCLR ]1 = color code fill screen with specified color (partial) NZCV 125+ 86
LPLOT LRPLOT ]1 = X coordinate
]2 = Y coordinate
]3 = color code		 plot a low resolution pixel to the working page NZCV 148+ 107
LLINE LRBLINE ]1 = X origin
]2 = X destination
]3 = Y-origin
]4 = Y destination
]5 = color		 plot an arbitrary line NZCV 441+ 297
LCIRC LRCIRCLE ]1 = Center x position
]2 = Center y position
]3 = Circle radius
]4 = Color		 plot a circle to low resolution page NZCV 2437+ 520
LVLIN LRVLINE ]1 = Y origin
]2 = Y destination
]3 = X coordinate
]4 = color		 plot a vertical line to the low resolution page NZCV 250+ 164
LHLIN LRHLINE ]1 = X origin
]2 = X destination
]3 = Y coordinate
]4 = color		 plot a horizontal line to low resolution page NZCV 246+ 161
LRGET LRGETPIX ]1 = X coordinate
]2 = Y coordinate		 get color value of low resolution pixel NZCV 110+ 71
LCHAR LRCHAR ]1 = X coordinate
]2 = Y coordinate
]3 = address of 3-byte character
]4 = color		 plot a large character to the low resolution page NZCV 441+ 439