Keyboard buffer reset

[jinshin]

Hi Sergey!
Not a bug or issue, just a quick question:
What is the actual purpose of

8088_bios/src/bios.asm

Lines 1057 to 1065 in 8fd8cea

	mov cx,1000
	.kbd_flush:
	mov ah,01h
	int 16h
	jz .kbd_no_key
	mov ah,00h
	int 16h
	.kbd_no_key:
	loop .kbd_flush

It's called right before keyboard buffer reset, so i think it's not needed, unless you wanted to do a stuck key detect there?

Also a suggestion - clean up keyboard buffer before entering settings loop, as entering a key several times causes menu reprint and that is quite slow thing. Like this:

.menu_loop:
	mov	si,msg_set_prompt
	call	print

.menu_input:				; cleanup buffer before start preocessing input
	mov	ah,01
	int	16h
	jz	.menu_next
	mov	ah,00
	int	16h
	jmp	.menu_input
.menu_next: