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  • Concertina II Block Headers Made Clearer

    From John Savard@quadibloc@invalid.invalid to comp.arch on Mon Aug 11 06:55:50 2025
    From Newsgroup: comp.arch

    I have taken action to make the documentation of the block headers in the Concertina II ISA clearer.
    In order for me to keep things straight as I defined the headers, I needed
    to keep them in a diagram that was in opcode order. But that meant that
    all the different kinds of headers were jumbled together.
    So now I have added three diagrams, each one showing only the headers of
    one of the three basic types, and I use these to head up sections which document the headers of each type separately from those of the other types.
    The three basic types of header are:
    Headers for blocks consisting of 32-bit instructions.
    Headers which cause a block to consist of variable-length instructions.
    Other headers for blocks that consist of variable-length instructions.
    I think that this will help to make the system of block headers much
    clearer.

    John Savard
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