https://wikiti.brandonw.net/index.php?action=history&feed=atom&title=83Plus%3ABCALLs%3A8063 2026-04-05T18:16:46Z Revision history for this page on the wiki MediaWiki 1.23.5 https://wikiti.brandonw.net/index.php?title=83Plus:BCALLs:8063&diff=5009&oldid=prev 2006-08-05T15:15:12Z

<p></p> <p><b>New page</b></p><div>[[Category:83Plus:BCALLs:By Name:Other|CheckHeaderKey]] [[Category:83Plus:BCALLs:By Name|CheckHeaderKey]] [[Category:83Plus:BCALLs:By Address|8063 - CheckHeaderKey]]<br /> == Synopsis ==<br /> '''Unofficial Name:''' CheckHeaderKey<br /> <br /> '''BCALL Address:''' 8063<br /> <br /> Check if a given key (specified by an app or OS header) is present on the calculator.<br /> <br /> === Inputs ===<br /> * [[83Plus:RAM:8000|appData]] contains the app header<br /> <br /> === Outputs ===<br /> * Z if the key specified is present, either as a built-in (freeware) key or in the certificate.<br /> <br /> === Destroys ===<br /> * AF, BC, DE, HL<br /> * [[83Plus:RAM:8478|OP1]], [[83Plus:RAM:8100|ramCode]], [[83Plus:RAM:438D|appID]]<br /> <br /> == Comments ==<br /> Flash must be write-enabled first if you want to check for non-built-in keys.<br /> <br /> On the 84+, this routine does not accept the built-in 04 key as valid (even though [[83Plus:BCALLs:80FF|SetupOSPubKey]] will happily load it if requested.) Thus, in order for the calculator to accept an 04-signed OS, the 04 key must actually be present in the certificate. This seems to be a bug, though a convenient one for TI.</div>

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