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Rev 1700 Rev 1703
Line 9... Line 9...
9 
;;  KolibriOS 16-bit loader,                                    ;;
 9 
;;  KolibriOS 16-bit loader,                                    ;;
10 
;;                        based on bootcode for MenuetOS        ;;
 10 
;;                        based on bootcode for MenuetOS        ;;
11 
;;                                                              ;;
 11 
;;                                                              ;;
12 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 12 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Line 13... Line 13...
13 
 
 13 
 
Line 14... Line 14...
14 
$Revision: 1700 $
 14 
$Revision: 1703 $
15 
 
 15 
 
16 
 
 16 
 
Line 45... Line 45...
45 
	test	al,al
 45 
	test	al,al
46 
	jnz	@b
 46 
	jnz	@b
47 
	popa
 47 
	popa
48 
	ret
 48 
	ret
Line 49... Line -...
49 
 
 - 
 
50 
 getkey:
 - 
 
51 
;get number in range [bl,bh] (bl,bh in ['0'..'9'])
 - 
 
52 
; in: bx=range
 - 
 
53 
; out: ax=digit (1..9, 10 for 0)
 - 
 
54 
	mov	ah, 0
 - 
 
55 
	int	16h
 - 
 
56 
	cmp	al, bl
 - 
 
57 
	jb	getkey
 - 
 
58 
	cmp	al, bh
 - 
 
59 
	ja	getkey
 - 
 
60 
	push	ax
 - 
 
61 
	call	putchar
 - 
 
62 
	pop	ax
 - 
 
63 
	and	ax, 0Fh
 - 
 
64 
	jnz	@f
 - 
 
65 
	mov	al, 10
 - 
 
66 
@@:
 - 
 
Line 67... Line 49...
67 
	ret
 49 
 
68 
 
 50 
 
69 
setcursor:
 51 
setcursor:
70 
; in: dl=column, dh=row
 52 
; in: dl=column, dh=row
Line 88... Line 70...
88 
	int	0x13
 70 
	int	0x13
89 
	pop	ax
 71 
	pop	ax
90 
	jnc	@f
 72 
	jnc	@f
91 
	inc	si
 73 
	inc	si
92 
	cmp	si, 10
 74 
	cmp	si, 10
93 
	jb	@b
 - 
 
94 
	mov	si, badsect
 - 
 
95 
sayerr_plain:
 - 
 
96 
	call	printplain
 - 
 
97 
	jmp	$
 75 
	jnb	$
98 
@@:
 76 
@@:
99 
	pop	si
 77 
	pop	si
100 
	ret
 78 
	ret
Line -... Line 79...
- 
 
 79 
 
- 
 
 80 
sayerr_plain:
- 
 
 81 
	call	printplain
- 
 
 82 
	jmp	$
- 
 
 83 
 
- 
 
 84 
sayerr:
- 
 
 85 
	call	print
- 
 
 86 
	jmp	$
- 
 
 87 
 
101 
 
 88 
 
102 
; convert abs. sector number (AX) to BIOS T:H:S
 89 
; convert abs. sector number (AX) to BIOS T:H:S
103 
; sector number = (abs.sector%BPB_SecPerTrk)+1
 90 
; sector number = (abs.sector%BPB_SecPerTrk)+1
104 
; pre.track number = (abs.sector/BPB_SecPerTrk)
 91 
; pre.track number = (abs.sector/BPB_SecPerTrk)
105 
; head number = pre.track number%BPB_NumHeads
 92 
; head number = pre.track number%BPB_NumHeads
Line 207... Line 194...
207 
	dec	dx
 194 
	dec	dx
208 
	jnz	dfl1
 195 
	jnz	dfl1
209 
; draw bottom
 196 
; draw bottom
210 
	mov	si, d80x25_bottom
 197 
	mov	si, d80x25_bottom
211 
	mov	cx, d80x25_bottom_num * 80
 198 
	mov	cx, d80x25_bottom_num * 80
212 
;@@:
 199 
@@:
213 
;	lodsb
 200 
	lodsb
214 
;	stoswvmode
 201 
	stosw
215 
;	loop	@b
 202 
	loop	@b
Line 216... Line 203...
216 
 
 203 
 
Line 217... Line 204...
217 
	mov	byte [space_msg+80], 0	  ; now space_msg is null terminated
 204 
	mov	byte [space_msg+80], 0	  ; now space_msg is null terminated
Line 218... Line -...
218 
 
 - 
 
219 
	_setcursor d80x25_top_num,0
 - 
 
220 
 
 - 
 
221 
 
 - 
 
222 
sayerr:
 205 
 
Line 223... Line 206...
223 
	call	print
 206 
	_setcursor d80x25_top_num,0
224 
	jmp	$
 207 
 
225 
     cpugood:
 208 
cpugood:
Line 334... Line 317...
334 
; b) preboot_dma  = use DMA access?
 317 
; b) preboot_dma  = use DMA access?
335 
; c) preboot_vrrm = use VRR?
 318 
; c) preboot_vrrm = use VRR?
336 
; d) preboot_device = from what boot?
 319 
; d) preboot_device = from what boot?
Line 337... Line 320...
337 
 
 320 
 
338 
; determine default settings
 321 
; determine default settings
Line 339... Line 322...
339 
	mov	[.bSettingsChanged], 0
 322 
;        mov     [.bSettingsChanged], 0
340 
 
 323 
 
341 
;.preboot_gr_end:
 324 
;.preboot_gr_end:
342 
	mov	di, preboot_device
 325 
	mov	di, preboot_device
Line 358... Line 341...
358 
; following 4 lines set variables to 1 if its current value is 0
 341 
; following 4 lines set variables to 1 if its current value is 0
359 
	cmp	byte [di+preboot_dma-preboot_device], 1
 342 
	cmp	byte [di+preboot_dma-preboot_device], 1
360 
	adc	byte [di+preboot_dma-preboot_device], 0
 343 
	adc	byte [di+preboot_dma-preboot_device], 0
361 
	cmp	byte [di+preboot_biosdisk-preboot_device], 1
 344 
	cmp	byte [di+preboot_biosdisk-preboot_device], 1
362 
	adc	byte [di+preboot_biosdisk-preboot_device], 0
 345 
	adc	byte [di+preboot_biosdisk-preboot_device], 0
363 
; default value for VRR is OFF
 - 
 
364 
	cmp	byte [di+preboot_vrrm-preboot_device], 0
 - 
 
365 
	jnz	@f
 - 
 
366 
	mov	byte [di+preboot_vrrm-preboot_device], 2
 - 
 
367 
@@:
 - 
 
368 
; notify user
 - 
 
369 
	_setcursor 5,2
 - 
 
370 
 
 - 
 
371 
	mov	si, linef
 - 
 
372 
	call	printplain
 - 
 
373 
	mov	si, start_msg
 - 
 
374 
	call	print
 - 
 
375 
	mov	si, time_msg
 - 
 
376 
	call	print
 - 
 
377 
; get start time
 - 
 
378 
	call	.gettime
 - 
 
379 
	mov	[.starttime], eax
 - 
 
380 
	mov	word [.timer], .newtimer
 - 
 
381 
	mov	word [.timer+2], cs
 - 
 
382 
.printcfg:
 - 
 
383 
 
 - 
 
384 
	_setcursor 9,0
 - 
 
385 
	mov	si, current_cfg_msg
 - 
 
386 
	call	print
 - 
 
387 
	mov	si, curvideo_msg
 - 
 
388 
	call	print
 - 
 
389 
 
 - 
 
390 
;<<	    call    draw_current_vmode
 - 
 
391 
 
 - 
 
392 
	mov	si, usebd_msg
 - 
 
393 
	cmp	[preboot_biosdisk], 1
 - 
 
394 
	call	.say_on_off
 - 
 
395 
	mov	si, vrrm_msg
 - 
 
396 
	cmp	[preboot_vrrm], 1
 - 
 
397 
	call	.say_on_off
 - 
 
398 
	mov	si, preboot_device_msg
 - 
 
399 
	call	print
 - 
 
400 
	mov	al, [preboot_device]
 - 
 
401 
	and	eax, 7
 - 
 
402 
	mov	si, [preboot_device_msgs+eax*2]
 - 
 
403 
	call	printplain
 - 
 
404 
.show_remarks:
 - 
 
405 
; show remarks in gray color
 - 
 
406 
	mov	di, ((21-num_remarks)*80 + 2)*2
 - 
 
407 
	push	0xB800
 - 
 
408 
	pop	es
 - 
 
409 
	mov	cx, num_remarks
 - 
 
410 
	mov	si, remarks
 - 
 
411 
.write_remarks:
 - 
 
412 
	lodsw
 - 
 
413 
	push	si
 - 
 
414 
	xchg	ax, si
 - 
 
415 
	mov	ah, 1*16+7	; background: blue (1), foreground: gray (7)
 - 
 
416 
	push	di
 - 
 
417 
.write_remark:
 - 
 
418 
	lodsb
 - 
 
419 
	test	al, al
 - 
 
420 
	jz	@f
 - 
 
421 
	stosw
 - 
 
422 
	jmp	.write_remark
 - 
 
423 
@@:
 - 
 
424 
	pop	di
 - 
 
425 
	pop	si
 - 
 
426 
	add	di, 80*2
 - 
 
427 
	loop	.write_remarks
 - 
 
428 
.wait:
 - 
 
429 
	_setcursor 25,0 	; out of screen
 - 
 
430 
; set timer interrupt handler
 - 
 
431 
	cli
 - 
 
432 
	push	0
 - 
 
433 
	pop	es
 - 
 
434 
	push	dword [es:8*4]
 - 
 
435 
	pop	dword [.oldtimer]
 - 
 
436 
	push	dword [.timer]
 - 
 
437 
	pop	dword [es:8*4]
 - 
 
438 
	sti
 - 
 
439 
; wait for keypressed
 - 
 
440 
	xor	ax,ax
 - 
 
441 
	int	16h
 - 
 
442 
	push	ax
 - 
 
443 
; restore timer interrupt
 - 
 
444 
	mov	eax, [.oldtimer]
 - 
 
445 
	mov	[es:8*4], eax
 - 
 
446 
	mov	[.timer], eax
 - 
 
Line 447... Line 346...
447 
 
 346 
 
448 
	_setcursor 7,0
 347 
	_setcursor 7,0
449 
	mov	si, space_msg
 348 
	mov	si, space_msg
450 
	call	printplain
 349 
	call	printplain
451 
; clear remarks and restore normal attributes
 - 
 
452 
	push	es
 - 
 
453 
	mov	di, ((21-num_remarks)*80 + 2)*2
 - 
 
454 
	push	0xB800
 - 
 
455 
	pop	es
 - 
 
456 
	mov	cx, num_remarks
 - 
 
457 
	mov	ax, ' ' + (1*16 + 15)*100h
 - 
 
458 
@@:
 - 
 
459 
	push	cx
 - 
 
460 
	mov	cx, 76
 - 
 
461 
	rep	stosw
 - 
 
462 
	pop	cx
 - 
 
463 
	add	di, 4*2
 - 
 
464 
	loop	@b
 - 
 
465 
	pop	es
 - 
 
466 
	pop	ax
 - 
 
467 
; switch on key
 - 
 
468 
	cmp	al, 13
 350 
;        pop     ax              ; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ??
469 
	jz	.continue
 - 
 
470 
	or	al, 20h
 - 
 
471 
	cmp	al, 'a'
 - 
 
472 
	jz	.change_a
 - 
 
473 
	cmp	al, 'b'
 - 
 
474 
	jz	.change_b
 - 
 
475 
	cmp	al, 'c'
 - 
 
476 
	jz	.change_c
 - 
 
477 
	cmp	al, 'd'
 - 
 
478 
	jnz	.show_remarks
 - 
 
479 
	_setcursor 15,0
 - 
 
480 
	mov	si, bdev
 - 
 
481 
	call	print
 - 
 
482 
	mov	bx, '14'
 - 
 
483 
	call	getkey
 - 
 
484 
	mov	[preboot_device], al
 - 
 
485 
	_setcursor 13,0
 - 
 
486 
.d:
 - 
 
487 
	mov	[.bSettingsChanged], 1
 - 
 
488 
	call	clear_vmodes_table	       ;clear vmodes_table
 - 
 
489 
	jmp    .printcfg
 - 
 
490 
.change_a:
 - 
 
491 
.loops:
 - 
 
492 
	call	draw_vmodes_table
 - 
 
493 
	_setcursor 25,0 	; out of screen
 - 
 
494 
	xor	ax,ax
 - 
 
495 
	int	0x16
 - 
 
496 
 
 - 
 
497 
	mov	si,word [cursor_pos]
 - 
 
498 
 
 - 
 
499 
	cmp	ah,0x48;x,0x48E0               ; up
 - 
 
500 
	jne	.down
 - 
 
501 
	cmp	si,modes_table
 - 
 
502 
	jbe	.loops
 - 
 
503 
	sub	word [cursor_pos],size_of_step
 - 
 
504 
	jmp	.loops
 - 
 
505 
 
 - 
 
506 
.down:	cmp	ah,0x50;x,0x50E0               ; down
 - 
 
507 
	jne	.pgup
 - 
 
508 
	cmp	word[es:si+10],-1
 - 
 
509 
	je	.loops
 - 
 
510 
	add	word [cursor_pos],size_of_step
 - 
 
511 
	jmp	.loops
 - 
 
512 
 
 - 
 
513 
.pgup:	cmp	ah,0x49 		; page up
 - 
 
514 
	jne	.pgdn
 - 
 
515 
	sub	si, size_of_step*long_v_table
 - 
 
516 
	cmp	si, modes_table
 - 
 
517 
	jae	@f
 - 
 
518 
	mov	si, modes_table
 - 
 
519 
@@:
 - 
 
520 
	mov	word [cursor_pos], si
 - 
 
521 
	mov	si, word [home_cursor]
 - 
 
522 
	sub	si, size_of_step*long_v_table
 - 
 
523 
	cmp	si, modes_table
 - 
 
524 
	jae	@f
 - 
 
525 
	mov	si, modes_table
 - 
 
526 
@@:
 - 
 
527 
	mov	word [home_cursor], si
 - 
 
528 
	jmp	.loops
 - 
 
529 
 
 - 
 
530 
.pgdn:	cmp	ah,0x51 		; page down
 - 
 
531 
	jne	.enter
 - 
 
532 
	mov	ax, [end_cursor]
 - 
 
533 
	add	si, size_of_step*long_v_table
 - 
 
534 
	cmp	si, ax
 - 
 
535 
	jb	@f
 - 
 
536 
	mov	si, ax
 - 
 
537 
	sub	si, size_of_step
 - 
 
538 
@@:
 - 
 
539 
	mov	word [cursor_pos], si
 - 
 
540 
	mov	si, word [home_cursor]
 - 
 
541 
	sub	ax, size_of_step*long_v_table
 - 
 
542 
	add	si, size_of_step*long_v_table
 - 
 
543 
	cmp	si, ax
 - 
 
544 
	jb	@f
 - 
 
545 
	mov	si, ax
 - 
 
546 
@@:
 - 
 
547 
	mov	word [home_cursor], si
 - 
 
548 
	jmp	.loops
 - 
 
549 
 
 - 
 
550 
.enter: cmp	al,0x0D;x,0x1C0D               ; enter
 - 
 
551 
	jne	.loops
 - 
 
552 
	push	word [cursor_pos]
 - 
 
553 
	pop	bp
 - 
 
554 
	push	word [es:bp]
 - 
 
555 
	pop	word [x_save]
 - 
 
556 
	push	word [es:bp+2]
 - 
 
557 
	pop	word [y_save]
 - 
 
558 
	push	word [es:bp+6]
 - 
 
559 
	pop	word [number_vm]
 - 
 
560 
	mov	word [preboot_graph],bp 	  ;save choose
 - 
 
561 
 
 - 
 
562 
	jmp    .d
 - 
 
563 
 
 - 
 
564 
.change_b:
 - 
 
565 
	_setcursor 15,0
 - 
 
566 
	mov	si, ask_bd
 - 
 
567 
	call	print
 - 
 
568 
	mov	bx, '12'
 - 
 
569 
	call	getkey
 - 
 
570 
	mov	[preboot_biosdisk], al
 - 
 
571 
	_setcursor 11,0
 - 
 
572 
	jmp	.d
 - 
 
573 
.change_c:
 - 
 
574 
	_setcursor 15,0
 - 
 
575 
	mov	si, vrrmprint
 - 
 
576 
	call	print
 - 
 
577 
	mov	bx, '12'
 - 
 
578 
	call	getkey
 - 
 
579 
	mov	[preboot_vrrm], al
 - 
 
580 
	_setcursor 12,0
 - 
 
581 
	jmp	.d
 - 
 
582 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 - 
 
583 
.say_on_off:
 - 
 
584 
	pushf
 - 
 
585 
	call	print
 - 
 
586 
	mov	si, on_msg
 - 
 
587 
	popf
 - 
 
588 
	jz	@f
 - 
 
589 
	mov	si, off_msg
 - 
 
590 
@@:	jmp	printplain
 - 
 
591 
; novesa and vervesa strings are not used at the moment of executing this code
 - 
 
592 
virtual at novesa
 - 
 
593 
.oldtimer dd ?
 - 
 
594 
.starttime dd ?
 - 
 
595 
.bSettingsChanged db ?
 - 
 
596 
.timer dd ?
 - 
 
597 
end virtual
 351 
	jmp	.continue
598 
.loader_block dd -1
 - 
 
599 
.gettime:
 - 
 
600 
	mov	ah, 0
 - 
 
601 
	int	1Ah
 - 
 
602 
	xchg	ax, cx
 - 
 
603 
	shl	eax, 10h
 - 
 
604 
	xchg	ax, dx
 - 
 
605 
	ret
 - 
 
606 
.newtimer:
 - 
 
607 
	push	ds
 - 
 
608 
	push	cs
 - 
 
609 
	pop	ds
 - 
 
610 
	pushf
 - 
 
611 
	call	[.oldtimer]
 - 
 
612 
	pushad
 - 
 
613 
	call	.gettime
 - 
 
614 
	sub	eax, [.starttime]
 - 
 
615 
	sub	ax, 18*5
 - 
 
616 
	jae	.timergo
 - 
 
617 
	neg	ax
 - 
 
618 
	add	ax, 18-1
 - 
 
619 
	mov	bx, 18
 - 
 
620 
	xor	dx, dx
 - 
 
621 
	div	bx
 - 
 
622 
 
 - 
 
623 
; wait 5/4/3/2 seconds, 1 second
 - 
 
624 
	cmp	al, 1
 - 
 
625 
	mov	cl, 's'
 - 
 
626 
	ja	@f
 - 
 
627 
	mov	cl, ' '
 - 
 
628 
@@:	mov	[time_str+9], cl
 - 
 
629 
	add	al, '0'
 - 
 
630 
	mov	[time_str+1], al
 - 
 
631 
	mov	si, time_msg
 - 
 
632 
	_setcursor 7,0
 - 
 
633 
	call	print
 - 
 
634 
	_setcursor 25,0
 - 
 
635 
	popad
 - 
 
636 
	pop	ds
 - 
 
637 
	iret
 - 
 
638 
.timergo:
 - 
 
639 
	push	0
 - 
 
640 
	pop	es
 - 
 
641 
	mov	eax, [.oldtimer]
 - 
 
642 
	mov	[es:8*4], eax
 - 
 
643 
	mov	sp, 0EC00h
 352 
.loader_block dd -1
644 
.continue:
 353 
.continue:
645 
	sti
 354 
	sti
646 
	_setcursor 6,0
 355 
	_setcursor 6,0
647 
	mov	si, space_msg
 356 
	mov	si, space_msg
648 
	call	printplain
 357 
	call	printplain
649 
	call	printplain
 358 
	call	printplain
650 
	_setcursor 6,0
 359 
	_setcursor 6,0
651 
	mov	si, loading_msg
 360 
	mov	si, loading_msg
652 
	call	print
 361 
	call	print
653 
	_setcursor 15,0
 - 
 
654 
	cmp	[.bSettingsChanged], 0
 - 
 
655 
	jz	.load
 - 
 
656 
	cmp	[.loader_block], -1
 362 
	_setcursor 15,0
657 
	jz	.load
 - 
 
658 
	les	bx, [.loader_block]
 - 
 
659 
	mov	eax, [es:bx+3]
 - 
 
660 
	push	ds
 - 
 
661 
	pop	es
 - 
 
662 
	test	eax, eax
 - 
 
663 
	jz	.load
 - 
 
664 
	push	eax
 - 
 
665 
	mov	si, save_quest
 - 
 
666 
	call	print
 - 
 
667 
.waityn:
 - 
 
668 
	mov	ah, 0
 - 
 
669 
	int	16h
 - 
 
670 
	or	al, 20h
 - 
 
671 
	cmp	al, 'n'
 - 
 
672 
	jz	.loadc
 - 
 
673 
	cmp	al, 'y'
 - 
 
674 
	jnz	.waityn
 - 
 
675 
	call	putchar
 - 
 
Line 676... Line -...
676 
	mov	byte [space_msg+80], 186
 - 
 
677 
 
 - 
 
678 
	pop	eax
 - 
 
679 
	push	cs
 - 
 
680 
	push	.cont
 - 
 
681 
	push	eax
 363 
	jmp	 .load
682 
	retf			      ;call back
 364 
 
683 
.loadc:
 365 
.loadc:
684 
	pop	eax
 366 
	pop	eax
685 
.cont:
 367 
.cont:
Line 689... Line 371...
689 
	mov	byte [si+80], 0
 371 
	mov	byte [si+80], 0
690 
	_setcursor 15,0
 372 
	_setcursor 15,0
691 
	call	printplain
 373 
	call	printplain
692 
	_setcursor 15,0
 374 
	_setcursor 15,0
693 
.load:
 375 
.load:
694 
; \end{diamond}[02.12.2005]
 - 
 
Line 695... Line 376...
695 
 
 376 
 
Line 696... Line 377...
696 
; ASK GRAPHICS MODE
 377 
; ASK GRAPHICS MODE
Line 868... Line 549...
868 
	jz	@f
 549 
	jz	@f
869 
sayerr_floppy:
 550 
sayerr_floppy:
870 
	mov	dx, 0x3f2
 551 
	mov	dx, 0x3f2
871 
	mov	al, 0
 552 
	mov	al, 0
872 
	out	dx, al
 553 
	out	dx, al
873 
	mov	si, memmovefailed
 554 
;        mov     si, memmovefailed
874 
	jmp	sayerr_plain
 555 
	jmp	$
875 
@@:
 556 
@@:
876 
	pop	ax			; restore from stack count of words in boot+FAT
 557 
	pop	ax			; restore from stack count of words in boot+FAT
877 
	shl	ax, 1			; make bytes count from count of words
 558 
	shl	ax, 1			; make bytes count from count of words
878 
	and	eax, 0ffffh
 559 
	and	eax, 0ffffh
879 
	add	dword [si+8*3+2], eax
 560 
	add	dword [si+8*3+2], eax
Line 1053... Line 734...
1053 
 
 734 
 
1054 
	xor	ax, ax
 735 
	xor	ax, ax
Line 1055... Line 736...
1055 
	mov	es, ax
 736 
	mov	es, ax
1056 
 
 - 
 
1057 
	mov	bx, [es:0x9008] 	; vga & 320x200
 - 
 
1058 
;        mov     bx, ax
 - 
 
1059 
;      cmp     ax, 0x13
 - 
 
1060 
;        je      setgr
 - 
 
1061 
;        cmp     ax, 0x12
 737 
 
1062 
;        je      setgr
 738 
	mov	bx, [es:0x9008] 	; vga & 320x200
1063 
	mov	ax, 0x4f02		; Vesa
 739 
	mov	ax, 0x4f02		; Vesa
1064 
setgr:
 740 
setgr:
1065 
	int	0x10
 - 
 
1066 
	test	ah, ah
 741 
	int	0x10
1067 
	mov	si, fatalsel
 - 
 
1068 
	jnz	v_mode_error
 - 
 
1069 
; set mode 0x12 graphics registers:
 - 
 
1070 
;        cmp     bx, 0x12
 - 
 
1071 
;        jne     gmok2
 - 
 
1072 
;        mov     al, 0x05
 - 
 
1073 
;        mov     dx, 0x03ce
 - 
 
1074 
;        push    dx
 - 
 
1075 
;        out     dx, al      ; select GDC mode register
 - 
 
1076 
;        mov     al, 0x02
 - 
 
1077 
;        inc     dx
 - 
 
1078 
;        out     dx, al      ; set write mode 2
 - 
 
1079 
;        mov     al, 0x02
 - 
 
1080 
;        mov     dx, 0x03c4
 - 
 
1081 
;        out     dx, al      ; select VGA sequencer map mask register
 - 
 
1082 
;        mov     al, 0x0f
 - 
 
1083 
;        inc     dx
 - 
 
1084 
;        out     dx, al      ; set mask for all planes 0-3
 - 
 
1085 
;        mov     al, 0x08
 - 
 
1086 
;        pop     dx
 - 
 
1087 
;        out     dx, al      ; select GDC bit mask register
 742 
	test	ah, ah
1088 
			   ; for writes to 0x03cf
 743 
	jnz	$
1089 
gmok2:
 744 
gmok2: