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; b) preboot_mtrr = use hardware acceleration?
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; b) preboot_mtrr = use hardware acceleration?
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; c) preboot_vrrm = use VRR?
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; c) preboot_vrrm = use VRR?
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; d) preboot_device = from what boot?
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; d) preboot_device = from what boot?
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    mov    di, preboot_graph-0x10000
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    mov    di, preboot_graph-0x10000
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; check bootloader block
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; check bootloader block
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    cmp    [.loader_block-0x10000], 0
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    cmp    [.loader_block-0x10000], 1
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    jz    .noloaderblock
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    jnz    .noloaderblock
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    les    bx, [.loader_block-0x10000]
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    les    bx, [.loader_block-0x10000]
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    cmp    byte [es:bx], 1
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    cmp    byte [es:bx], 1
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    mov    si, loader_block_error-0x10000
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    mov    si, loader_block_error-0x10000
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    jnz    sayerr
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    jnz    sayerr
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    test    byte [es:bx+1], 1
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    test    byte [es:bx+1], 1