VolksForth/8086/msdos/src/multi.vid
Philip Zembrod 5dc3bbef7c Move all msdos block file Forth sources (.fb, .vid, .sys, .prn) to the
msdos/src subdir and generate .fth copies of the .fb files.
2022-02-01 22:33:21 +01:00

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This display interface uses BIOS call $10 functions for a fast display interface. A couple of state variables is contained in a vector that is task specific such that different tasks may use different windows. For simplicity windows always span the whole width of the screen. They can be defined by top and bottom line. This mechanism is used for a convenient status display line on the bottom of the screen. \ Multitsking display interface loadscreen ks phz 31jan22 Onlyforth \needs Assembler 2 loadfrom asm.fb User area area off \ points at active window Variable status \ to switch status on/off | Variable cursor \ points at area with active cursor 1 8 +thru .( Multitasking display driver loaded ) cr \ Multitsking display interface ks 6 sep 86 : Area: Create 0 , 0 , 7 c, Does> area ! ; \ | col | row | top | bot | att | Area: terminal terminal area @ cursor ! : (area Create dup c, 1+ Does> c@ area @ + ; 0 | (area ccol | (area crow | (area ctop | (area cbot (area catt drop : window ( topline botline -- ) cbot c! ctop c! ; : full 0 c/col 2- window ; full \ Multitask (type (emit ks 20 dez 87 Code (type ( addr len -- ) W pop I push R push u' area U D) I mov U push D U mov $F # A+ mov $10 int u' catt I D) R- mov 3 # A+ mov $10 int C push D push $E0E # C mov 1 # A+ mov $10 int I ) D mov 1 # C mov U inc [[ U dec 0= not ?[[ 2 # A+ mov $10 int D- inc ' c/row >body #) D- cmp 0= not ?[[ W ) A- mov W inc 9 # A+ mov $10 int ]]? ]? D I ) mov D pop cursor #) I cmp 0= ?[ I ) D mov ]? 2 # A+ mov $10 int C pop 1 # A+ mov $10 int U pop R pop I pop D pop ' pause #) jmp end-code : (emit ( char -- ) sp@ 1 (type drop ; \ Multitask (at (at? ks 04 aug 87 Code (at ( row col -- ) A pop A- D+ mov u' area U D) W mov D W ) mov cursor #) W cmp 0= ?[ R push U push $F # A+ mov $10 int 2 # A+ mov $10 int U pop R pop ]? D pop Next end-code Code (at? ( -- row col ) D push u' area U D) W mov W ) D mov D+ A- mov 0 # A+ mov A+ D+ mov A push Next end-code Code curat? ( -- row col ) D push R push $F # A+ mov $10 int 3 # A+ mov $10 int R pop 0 # A mov D+ A- xchg A push Next end-code \ cur! curshape setpage ks 28 jun 87 : cur! \ set cursor into current task's window area @ cursor ! (at? (at ; cur! 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 \ Multitask normal invers blankline ks 01 nov 88 : normal 7 catt c! ; : invers $70 catt c! ; : underline 1 catt c! ; : bright $F catt c! ; Code blankline D push R push U push $F # A+ mov $10 int u' area U D) W mov u' catt W D) R- mov 3 # A+ mov $10 int C push D push $E0E # C mov 1 # A+ mov $10 int W ) D mov 2 # A+ mov $10 int ' c/row >body #) C mov D- C- sub bl # A- mov 9 # A+ mov C- C- or 0= not ?[ $10 int ]? D pop 2 # A+ mov $10 int \ set cursor back C pop 1 # A+ mov $10 int \ cursor visible again U pop R pop D pop ' pause #) jmp end-code | : lineerase ( line# -- ) 0 (at blankline ; \ Multitask (del scroll (cr (page ks 04 okt 87 : (del (at? ?dup IF 1- 2dup (at bl (emit (at exit THEN drop ; Code scroll D push R push U push u' area U D) W mov u' catt W D) R+ mov u' ctop W D) D mov D- C+ mov 0 # C- mov ' c/row >body #) D- mov D- dec $601 # A mov $10 int U pop R pop D pop Next end-code : (cr (at? drop 1+ dup cbot c@ u> IF scroll drop cbot c@ THEN lineerase ; : (page ctop c@ cbot c@ DO I lineerase -1 +LOOP ; \ Multitask status display ks 10 okt 87 ' (emit ' display 2 + ! ' (cr ' display 4 + ! ' (type ' display 6 + ! ' (del ' display 8 + ! ' (page ' display &10 + ! ' (at ' display &12 + ! ' (at? ' display &14 + ! : .base base @ decimal dup 2 .r base ! ; : .sp ( n -- ) ." s" depth swap 1+ - 2 .r ; : (.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 ks 04 aug 87 | : fstat ( n -- ) .base .sp .space .scr .dr file? 2 spaces order ; | Area: statusline statusline c/col 1- dup window page invers terminal : (.status output @ display area @ statusline status @ IF (at? drop 0 (at 2 fstat blankline ELSE normal page invers THEN area ! output ! ; ' (.status Is .status : bye status off .status bye ;