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    <p>Just an idea: looking at <a href="https://gna.org/projects/grub4dos/" rel="nofollow noreferrer">GRUB for DOS</a> source (asm.s), the <code>console_checkkey</code> function is using BIOS <code>INT 16H Function 01</code>, and not function 00, as you are trying to do. Maybe you'd want to check if a key is waiting to be input.</p> <p>The <code>console_checkkey</code> code is setting the CPU to real mode in order to use the BIOS, as <a href="https://stackoverflow.com/questions/217731/x86-assembly-keyboard-input#217755">@skizz suggested</a>.</p> <p>You can also try using GRUB functions directly (if still mapped in real mode).</p> <p>A note on reading assembly source: in this version </p> <pre><code>movb $0x1, %ah </code></pre> <p>means move constant byte (0x1) to register <code>%ah</code></p> <p>The <code>console_checkkey</code> from GRUB asm.s:</p> <pre><code>/* * int console_checkkey (void) * if there is a character pending, return it; otherwise return -1 * BIOS call "INT 16H Function 01H" to check whether a character is pending * Call with %ah = 0x1 * Return: * If key waiting to be input: * %ah = keyboard scan code * %al = ASCII character * Zero flag = clear * else * Zero flag = set */ ENTRY(console_checkkey) push %ebp xorl %edx, %edx call EXT_C(prot_to_real) /* enter real mode */ .code16 sti /* checkkey needs interrupt on */ movb $0x1, %ah int $0x16 DATA32 jz notpending movw %ax, %dx //call translate_keycode call remap_ascii_char DATA32 jmp pending notpending: movl $0xFFFFFFFF, %edx pending: DATA32 call EXT_C(real_to_prot) .code32 mov %edx, %eax pop %ebp ret </code></pre>
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    1. POHow to get keyboard input with x86 bare metal assembly?
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