https://wikiti.brandonw.net/index.php?action=history&feed=atom&title=83Plus%3ABCALLs%3A4CED 2026-05-09T18:12:03Z Revision history for this page on the wiki MediaWiki 1.23.5 https://wikiti.brandonw.net/index.php?title=83Plus:BCALLs:4CED&diff=9305&oldid=prev 2010-11-23T02:17:45Z

<p>Created page with &#039;== Synopsis == &#039;&#039;&#039;Official Name:&#039;&#039;&#039; ClearRow &#039;&#039;&#039;BCALL Address:&#039;&#039;&#039; 4CED Clears eight consecutive LCD display drive rows === Inputs === * A = LCD display driver row coordinate (…&#039;</p> <p><b>New page</b></p><div>== Synopsis ==<br /> '''Official Name:''' ClearRow<br /> <br /> '''BCALL Address:''' 4CED<br /> <br /> Clears eight consecutive LCD display drive rows<br /> <br /> === Inputs ===<br /> * A = LCD display driver row coordinate (0x80 – 0xBF) <br /> <br /> === Outputs ===<br /> * Eight pixel rows cleared <br /> * Driver left in X increment mode (the default)<br /> <br /> === Destroys ===<br /> * AF, B, DE<br /> <br /> === Comments ===<br /> This routine requires A to be in LCD display driver row (X) coordinates, <br /> which have a valid range between 0x80 – 0xBF, with the top pixel row equal<br /> to 0x80 and the bottom pixel row equal to 0xBF. Passing in a value for A <br /> outside this range will cause unpredictable results and probably a lockup. <br /> This routine erases eight consecutive rows, so if you pass in A = 0x88, the <br /> 9th – 16th pixel rows from the top of the display are erased. If you pass in a <br /> value between 0xB9 – 0xBF, the erased rows wrap back to the top of the <br /> display. In normal usage, if you are erasing a line of large text, the A value <br /> should be a multiple of 0x08.<br /> <br /> [[Category:83Plus:BCALLs:By Name|ClearRow]]<br /> [[Category:83Plus:BCALLs:By Name:Display|ClearRow]]<br /> [[Category:83Plus:BCALLs:By Address|4CED - ClearRow]]</div>

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