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Category Archives: 8086/8088
Undocumented 8086 Opcodes, Part I
This is a guest post by Raúl Gutiérrez Sanz This multi-part document is about undocumented 8086 processor opcodes and their behavior. Most of the document will likely apply to the 8088 processor as well, but this has not been verified. … Continue reading
Posted in 8086/8088, Intel, Undocumented
7 Comments
Undocumented 8086 Opcodes
A minor mystery recently surfaced while analyzing DOS boot sectors. DOS uses several criteria when deciding whether a boot sector contains a valid BPB, and one of the criteria is (oddly enough) checking whether the first two bytes of the … Continue reading
Posted in 8086/8088, Documentation, Intel, x86
57 Comments