Revision as of 04:17, 9 June 2024 view source Xtex (talk \| contribs) Interface administrators, Administrators 977 edits m Bot: Replace deprecated source tag with syntaxhighlight ← Older edit		Latest revision as of 22:55, 15 June 2024 view source Xtex (talk \| contribs) Interface administrators, Administrators 977 edits mNo edit summary
Line 21: times 512-($-$$) db 0 </syntaxhighlight> The CPU starts in real mode and the [[BIOS]] loads this code at address 0000:7c00. "<code>times 512-($-$$) db 0"</code> is NASM's way of saying fill up 512 bytes with zeroes, and partcopy is going to expect that (200 in Hex = 512 in Decimal). Change it and partcopy will likely fail. There is often a boot signature (0xAA55) at the end. Older versions of some BIOSes looked for this in order to identify a boot sector on a disk. It is evidently unnecessary nowadays, unless you're running the code on a legacy BIOS, or in QEMU. If it's needed, the last line would be replaced with (or some version of it):

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