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fix bios systemc reset (T.Yui)

biosmain:		sti
				jmp		biosinit

biosmain2:		test	byte [0x0480], 2
				je		short .cpuided

				CPU		286
				cli
				mov		al, 0x0e
				out		0x37, al
				smsw	ax
				push	ax
				push	cs
				push	.reset
				mov		[0x0406], ss
				mov		[0x0404], sp
				mov		al, 0
				out		0xf0, al
				hlt
.reset:			pop		ax
				lmsw	ax
				mov		[0x0486], dx
				sti
.cpuided:
				mov		al, 0x0f
				out		0x37, al
				mov		al, 0x0b
				out		0x37, al
				mov		al, 0x09
				out		0x37, al

				CPU		8086
				mov		word [0x04ac], 0x0c
				call	diskbios_set
diskbiosinit1:	mov		es, [0x04ae]
				cmp		word [es:0x0009], 0xaa55
				jne		short nextparag1
				mov		al, [bx]
				or		al, al
				jne		short nextparag1
				call	calldiskbios
nextparag1:		inc		bx
				inc		byte [0x04af]
				loop	diskbiosinit1

				mov		word [0x04ac], 0x0f
				call	diskbiosinit2
				mov		word [0x04ac], 0x12
				call	diskbiosinit2

%if 0	; ide test
				mov		ax, 0a0ah
				mov		word [0x04ac], 0x15
				call	diskbiosinit2
%else
				db		9ah					; call far
				dw		027e8h
				dw		0fd80h
%endif

				in		al, 31h
				test	al, 1
				jne		short callbasic
				int		1fh
callbasic:		int		1eh

diskbios_set:	mov		bx, 04d0h
				mov		cx, 0010h
				mov		word [0x04ae], 0xd000
				ret

diskbiosinit2:	call	diskbios_set
.loop:			test	byte [bx], 0x40
				je		short .skip
				call	calldiskbios
.skip:			inc		bx
				inc		byte [0x04af]
				loop	.loop
				ret

calldiskbios:	push	ax
				push	bx
				push	cx
				call	far [0x04ac]
				pop		cx
				pop		bx
				pop		ax
				ret