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using Manic Miner and Jet Set Willy game engines
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Message: 5005
Author: john_elliott_uk
Date: 02/11/2005
Subject: Re: Hex-editors for TAP files / Disassemblies
In manicminerandjetsetwilly@yahoogroups.com, andrewbroad wrote:
I had no
difficulty in editing the original JSW (JETSET.TAP) as John
described (21 45 45 -> 21 42 06, and 21 07 07 -> 21 06 42).However, this example only works because it happens not to break the
checksum of "Bytes: jsw.js2". JSW.JS2 certainly isn't the original filename :-) So whenever you edit a TAP file in a hex-editor, there's a 255/256
chance that you'll break the checksum of the Spectrum-file you're
editing (this is not an issue for SNA files, which have no
checksums).
And this is why I didn't mention it; I was hex-editing a snapshot.
+3DOS files don't have this sort of checksum so they're safe to be
hex-edited as well.
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