VolksForth/msdos/bios.vid

                                                                This video display interface utilizes the ROM BIOS call $10.    The display is fairly fast and should work on most IBM          compatible computers                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            \ BIOS display interface                     ks  1 secas 09jun20  Onlyforth   \needs Assembler   2 loadfrom asm.fb                Variable dpage        dpage off                                 Variable top          top off                                                                                                   Code (at    ( lin col -- )   A pop   R push   U push               dpage #) R+ mov   A- D+ mov   2 # A+ mov   $10 int              U pop   R pop   D pop   Next   end-code                                                                                      Code (at?   ( -- lin col )   D push   R push   U push              dpage #) R+ mov   3 # A+ mov   $10 int   U pop   R pop          D+ A- mov   0 # A+ mov   A+ D+ mov   A push   Next           end-code                                                                                                                        1 6 +thru   .( BIOS display interface active) cr                                                                              \ BIOS  normal invers  blankline                  ks  1 sep 86    : full            top off ;                                                                                                     Variable attribut     7 attribut !                                                                                              : normal     7 attribut ! ;   : invers   $70 attribut ! ;       : underline  1 attribut ! ;   : bright    $F attribut ! ;                                                                       Code blankline      D push   R push   U push                       dpage #) R+ mov   attribut #) R- mov                            3 # A+ mov   $10 int   ' c/row >body #) C mov                   D- C- sub   bl # A- mov   9 # A+ mov   $10 int                  U pop   R pop   D pop   Next   end-code                                                                                    | : lineerase   0 (at blankline ;                                                                                               \ curshape  setpage  curat?                       ks  8 mar 88                                                                    Code curshape  ( top bot -- )   D C mov   D pop                    D- C+ mov   1 # A+ mov   $10 int   D pop   Next              end-code                                                                                                                        Code setpage   ( n -- )                                            $503 # A mov   D- A- and   $10 int   D pop   Next            end-code                                                                                                                        ' (at? Alias curat?                                                                                                                                                                                                                                                                                                                                                                           \ BIOS  (type  (emit                              ks  1 sep 86                                                                    Code (type   ( addr len -- )   W pop   R push   U push             D U mov   dpage #) R+ mov   attribut #) R- mov                  3 # A+ mov   $10 int   U inc   C push   $E0E # C mov            1 # A+ mov   $10 int   1 # C mov   [[  U dec  0= not            ?[[  D- inc   ' c/row >body #) D- cmp  0= not                        ?[[  W ) A- mov   W inc   9 # A+ mov                                 $10 int   2 # A+ mov   $10 int  ]]?                   ]?   C pop   1 # A+ mov   $10 int                               U pop   R pop   D pop   ' pause #) jmp                       end-code                                                                                                                        : (emit  ( char -- )   sp@ 1 (type drop ;                                                                                                                                                     \ BIOS  (del scroll (cr (page                     ks  2 sep 86                                                                    : (del    (at? ?dup                                                IF  1- 2dup (at  bl (emit  (at exit  THEN  drop ;                                                                            Code scroll   D push   R push   U push   attribut #) R+ mov        top #) C+ mov   0 # C- mov   ' c/row >body #) D- mov            D- dec   ' c/col >body #) D+ mov   D+ dec   D+ dec              $601 # A mov   $10 int   U pop   R pop   D pop   Next        end-code                                                                                                                        : (cr     (at? drop 1+ dup 2+ c/col u>                             IF  scroll 1-  THEN  lineerase ;                                                                                             : (page   top @ c/col 2- DO  I lineerase  -1 +LOOP ;                                                                          \ BIOS  status display                            ks  2 sep 86                                                                    ' (emit ' display   2 + !  ' (cr   ' display   4 + !            ' (type ' display   6 + !  ' (del  ' display   8 + !            ' (page ' display &10 + !                                       ' (at   ' display &12 + !  ' (at?  ' display &14 + !                                                                            : .sp      ( n -- )  ."  s" depth   swap 1+ - 2 .r ;            : .base    base @  decimal dup 2 .r   base ! ;                  : (.drv    ( n -- )   Ascii A + emit ." : " ;                   : .dr      ."   " drv (.drv ;                                   : .scr     blk @ IF  ."   Blk" blk  ELSE  ."   Scr" scr  THEN              @ 5 .r ;                                             : .space   ."   Dic" s0 @ here $100 + - 6 u.r ;                                                                                                                                               \ statuszeile                                 ks  1 sep 86                                                                      | : fstat  ( n -- )   .base .sp                                      .space .scr .dr file? 2 spaces order ;                                                                                       : .stat    attribut @   output @  (at?                             display  invers  c/col 1- 0 (at  4 fstat                        blankline  (at   output !   attribut ! ;                                                                                     : +stat   ['] .stat Is .status  .status ;                                                                                       : -stat   [']  noop Is .status ;