Difference between revisions of "84PCSE:BCALLs:4D74"

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(Destroys: BC, DE, HL)
Line 18: Line 18:
=== Destroys ===
=== Destroys ===
* AF
* AF, BC, DE, HL
* Interrupts disabled
* Interrupts disabled

Latest revision as of 10:09, 20 October 2013


Hypothesized Official Name: DrawRectBorderClear

BCALL Address: 4D74h

Draw a rectangular outline 1 pixel wide, and fill the interior of the rectangle with white.


  • HL = X coordinate of left edge
  • DE = X coordinate of right edge (must be greater than HL and at most 319)
  • B = Y coordinate of top edge (from top of screen)
  • C = Y coordinate of bottom edge (must be greater than B and at most 239)
  • (penFGColor) = RGB color of outline



  • AF, BC, DE, HL
  • Interrupts disabled


The rectangle is drawn only to the LCD, never to the graph buffer.

The dimensions of the enclosed area are (HL-DE-1) × (C-B-1). The outer dimensions of the border are (HL-DE+1) × (C-B+1).