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1537 lvd 1 
        STRUCT BLOCK_HEADER
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length      WORD    BLOCK_HEADER
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type        BYTE    $AB
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name        TEXT    10, { "none", 32, '!' } ; will produce "none !!!!!" default data
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                    ; because this is definition of the field, here last byte is "filler"
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datastart   WORD
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datalen     WORD
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checksum    BYTE    $CC
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        ENDS
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        ORG  0x8000
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head1   BLOCK_HEADER {      ; Multi-line initialization requires curly braces.
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    , ,                     ; Keeping default length and type by specifying empty values.
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    { 'New',                ; The final `name` data will be "New Name!!"
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        32,                 ; overwriting only 8 bytes of default data.
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        "Name" },           ; The last "e" is NOT "filler" in the non-default value.
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        $8000, $1234        ; Explicit datastart and datalen values.
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}                           ; End of initial data block ("checksum" keeps default value).
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; machine code (struct data):
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; 12 00 AB 4E 65 77 20 4E 61 6D 65 21 21 00 80 34 12 CC
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; = { $0012, $AB, "New Name!!", $8000, $1234, $CC }