KEYBOARD.X86

keyint_proc:	push	ax
				push	bx
				push	cx
				push	ds
				push	es
				mov		ax, DATASEG			; dsレジスタは設定しなくてもいいん
				mov		ds, ax				; だけど DEBUG時に困るね…
				xor		ax, ax
				mov		es, ax
				in		al, 43h
				test	al, 2
				je		short keyint_ed
				in		al, 41h
				mov		ds:[KEYSTAT], al
				mov		cl, al
				and		cl, 7
				mov		ah, 1
				shl		ah, cl
				xor		bx, bx
				mov		bl, al
				mov		cl, 3
				shr		bl, cl
				and		bl, 0fh
				add		bx, MEM_KB_KY_STS
				test	al, 80h
				jne		short keyrelease
				or		es:[bx], ah
				jmp		short keyint_shift
keyrelease:		not		ah
				and		es:[bx], ah
				and		al, 7fh
keyint_shift:	cmp		al, 70h
				jb		short keyint_ed
				cmp		al, 75h
				ja		short keyint_ed
				mov		al, es:[bx]
				inc		bx
				inc		bx
				and		al, 1fh
				and		byte ptr es:[bx], 0e0h
				or		es:[bx], al
keyint_ed:		mov		al, 20h
				out		0, al
				pop		es
				pop		ds
				pop		cx
				pop		bx
				pop		ax
				iret


boot_keycheck:	push	ds
				xor		cx, cx
				mov		ds, cx
				cmp		byte ptr ds:[0531h], cl
				jns		short bkc_nonhelp
				mov		al, BOOT_WFLASH
				mov		cl, ds:[0532h]
				test	cl, 8							; '8'
				jne		short bkc_helpret
				mov		al, BOOT_REVISION
				test	byte ptr ds:[0533h], 4			; '1'
				jne		short bkc_helpret
				mov		al, BOOT_RFLASH
				test	cl, 10h							; '9'
				jne		short bkc_helpret
				mov		al, BOOT_MENU
bkc_helpret:	pop		ds
				ret

bkc_nonhelp:	mov		cl, ds:[053ah]
				mov		ch, cl
				and		cx, 111eh
				cmp		cl, 1eh
				mov		al, BOOT_FIRMWARE
				je		short bkc_end
				cmp		ch, 11h
				mov		al, BOOT_DIPSWINIT
				je		short bkc_end
				mov		al, BOOT_NORMAL
bkc_end:		pop		ds
				ret