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not_ginger_matt: It is actually BASIC programs that are most caught out by the AIF checking. Pure BASIC isn't affected of course, but many authors have used tools which squashed the BASIC program, added on a bit of code so it could be typed as an absolute, and then run through the squeeze tool. This is to both reduce the size of the executable and to protect it from casual observation. Programs in such form wont work on the A9 as the absolute does not contain an AIF header, but just a branch to a relocation routine, and a command to invoke BASIC with an in memory program.

 is a RISC OS Userdruck on 4/7/06 9:17AM
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