https://wikiti.brandonw.net/index.php?action=history&feed=atom&title=83Plus%3ABCALLs%3A80F9 2026-05-13T22:25:18Z Revision history for this page on the wiki MediaWiki 1.23.5 https://wikiti.brandonw.net/index.php?title=83Plus:BCALLs:80F9&diff=5790&oldid=prev 2007-03-12T23:00:47Z

<p></p> <p><b>New page</b></p><div>[[Category:83Plus:BCALLs:By Name:Other|DispOSPercentage]] [[Category:83Plus:BCALLs:By Name|DispOSPercentage]] [[Category:83Plus:BCALLs:By Address|80F9 - DispOSPercentage]]<br /> == Synopsis ==<br /> '''Unofficial Name:''' DispOSPercentage<br /> <br /> '''BCALL Address:''' 80F9<br /> <br /> '''Minimum HW Version:''' 2<br /> <br /> Displays percentage of OS received so far and erases Flash for next page to be received.<br /> <br /> === Inputs ===<br /> * ([[83Plus:RAM:82A3|appSearchPage]]): previous page received (0FFh for none)<br /> * ([[83Plus:RAM:867D|ioData]]+15): flag byte (80h to NOT erase Flash sector)<br /> * ([[83Plus:RAM:867D|ioData]]+16): address to receive data to<br /> * ([[83Plus:RAM:867D|ioData]]+18): OS page to be received next<br /> * ([[83Plus:RAM:83E6|83E6]]): number of pages received so far<br /> * ([[83Plus:RAM:83E7|83E7]]): total number of OS pages<br /> <br /> === Outputs ===<br /> * A: Flash page to receive data to<br /> * DE: address to receive data to<br /> <br /> === Destroys ===<br /> * All<br /> <br /> == Comments ==<br /> This BCALL only exists on the 84+ and 84+SE.<br /> <br /> The OS MUST be marked invalid with [[83Plus:BCALLs:8093|MarkOSInvalid]] before BCALLing this entry point, which requires unlocking Flash.<br /> <br /> It will display &quot;Receiving...Operating System&quot; along with the percentage of the OS received so far. The boot code uses it when receiving an OS.<br /> <br /> It refuses to erase page 18h/38h/78h, and will only erase a page divisible by 4 (as in, a Flash sector).<br /> <br /> There may be more or fewer inputs, but you should never use this routine anyway, so it doesn't matter.</div>

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