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Message: [QUOTE="Europia79, post: 116006, member: 120499"] I have literally patched thousands upon thousands of romhacks & translations and there is always a few "problem patches" with various kinds of issues. Probably the most common issue I think is simply that RHDN &/or the documentation has incorrect information & patching instructions. And I think that's possibly what I'm dealing with here. [URL unfurl="true"]https://www.romhacking.net/hacks/993/[/URL] I'm trying to patch[B] Chrono Trigger Impossible[/B] for the [B]SNES[/B], and I want an exact byte-for-byte copy of what the author intended. So, these SNES patches sometimes require a 512 byte Header, and sometimes they do not. Most of the time, I can simply patch BOTH and see which ones doesn't work. However, in this case, they BOTH work, so I'm at a loss as to which one is actually correct here ? The [ICODE]ips[/ICODE] patch is 4415 bytes. The Headered version produces a difference of 1120 bytes with CRC-32 [ICODE]9892127E[/ICODE] (header removed after patching), while the Headerless version has a difference of 1742 bytes with a CRC-32 of [ICODE]31F48D0A[/ICODE]. And between them, there's a 2715 byte difference. Anyways, this question is both specifically referring to the [B]Impossible[/B] mod, as well as all of [B]Chrono Trigger[/B] hacks in general (since it's likely that I'm going to encounter this same issue with other [B]CT [/B]patches). Since I've noticed that [B]CDRomance[/B] has prepatched ROMs, I was hoping someone here had the technical expertise to help out ? Otherwise, it looks like I'll be forced to reference the [B]IPS[/B] file format and write my own parser that counts the number of writes (in bytes) it's making and compare that with the above differences ? Thanks, Euro [automerge]1741238124[/automerge] Based on [URL]https://zerosoft.zophar.net/ips.php[/URL] And: [CODE=bash]#!/bin/bash file="patch.ips"; eof="454F46"; declare -i index=5; declare -i count=0; while true do offset=$(xxd -ps -s ${index} -l 3 "${file}"); index+=3; size=$(xxd -ps -s ${index} -l 2 "${file}"); index+=2; data=$(xxd -ps -s ${index} -l 0x${size} "${file}"); index+=0x${size}; count+=0x${size}; echo "--------------------"; printf "index: '%x'\n" ${index}; printf "offset: '%x'\n" 0x${offset}; printf "size: '%x'\n" 0x${size}; echo "data: '${data}'"; echo "count: '${count}'"; if [ -z "$data" ]; then break; fi; done echo "--------------------"; echo "count: '${count}'"; exit 0; [/CODE] I'm guessing that the Unheadered ROM is the correct one to use ? Despite the patching instructions saying to use a Headered ROM ? [/QUOTE]

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